From 9f053a6f013e8ba6ff47b5d1f715cc57dc8f8fd1 Mon Sep 17 00:00:00 2001
From: Daniel Vogelheim <30862698+otherdaniel@users.noreply.github.com>
Date: Fri, 29 Nov 2024 08:52:24 +0000
Subject: [PATCH] Modify-able config. (#237)

SHA: 7e2f1271e46e645a3ae00b86d79d05934a29c4c5
Reason: push, by otherdaniel

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
---
 index.html | 1258 +++++++++++++++++++++++++---------------------------
 1 file changed, 595 insertions(+), 663 deletions(-)

diff --git a/index.html b/index.html
index da51d1b..4e14a08 100644
--- a/index.html
+++ b/index.html
@@ -4,11 +4,22 @@
   <title>HTML Sanitizer API</title>
   <meta content="width=device-width, initial-scale=1, shrink-to-fit=no" name="viewport">
   <link href="https://www.w3.org/StyleSheets/TR/2021/cg-draft" rel="stylesheet">
-  <meta content="Bikeshed version 6270e4735, updated Tue Aug 6 12:12:30 2024 -0700" name="generator">
+  <meta content="Bikeshed version 742f3d674, updated Mon Nov 4 14:56:54 2024 -0800" name="generator">
   <link href="https://wicg.github.io/sanitizer-api/" rel="canonical">
-  <meta content="85d25b5c601a04dd9ef44fee84699fb85aba5b8e" name="revision">
+  <meta content="7e2f1271e46e645a3ae00b86d79d05934a29c4c5" name="revision">
   <meta content="dark light" name="color-scheme">
   <link href="https://www.w3.org/StyleSheets/TR/2021/dark.css" media="(prefers-color-scheme: dark)" rel="stylesheet" type="text/css">
+<style>
+/* Boxes around algorithms. */
+[data-algorithm]:not(.heading) {
+  padding: .5em;
+  border: thin solid #ddd; border-radius: .5em;
+  margin: .5em calc(-0.5em - 1px);
+}
+[data-algorithm]:not(.heading) > :first-child { margin-top: 0; }
+[data-algorithm]:not(.heading) > :last-child { margin-bottom: 0; }
+[data-algorithm] [data-algorithm] { margin: 1em 0; }
+</style>
 <style>/* Boilerplate: style-autolinks */
 .css.css, .property.property, .descriptor.descriptor {
     color: var(--a-normal-text);
@@ -737,13 +748,14 @@
   <div class="head">
    <p data-fill-with="logo"><a class="logo" href="https://www.w3.org/"> <img alt="W3C" height="48" src="https://www.w3.org/StyleSheets/TR/2021/logos/W3C" width="72"> </a> </p>
    <h1 class="p-name no-ref" id="title">HTML Sanitizer API</h1>
-   <p id="w3c-state"><a href="https://www.w3.org/standards/types#CG-DRAFT">Draft Community Group Report</a>, <time class="dt-updated" datetime="2024-09-18">18 September 2024</time></p>
+   <p id="w3c-state"><a href="https://www.w3.org/standards/types/#CG-DRAFT">Draft Community Group Report</a>, <time class="dt-updated" datetime="2024-11-29">29 November 2024</time></p>
    <div data-fill-with="spec-metadata">
     <dl>
      <dt>This version:
      <dd><a class="u-url" href="https://wicg.github.io/sanitizer-api/">https://wicg.github.io/sanitizer-api/</a>
      <dt>Issue Tracking:
      <dd><a href="https://github.com/WICG/sanitizer-api/issues/">GitHub</a>
+     <dd><a href="#issues-index">Inline In Spec</a>
      <dt class="editor">Editors:
      <dd class="editor p-author h-card vcard" data-editor-id="68466"><a class="p-name fn u-url url" href="https://frederik-braun.com">Frederik Braun</a> (<span class="p-org org">Mozilla</span>) <a class="u-email email" href="mailto:fbraun@mozilla.com">fbraun@mozilla.com</a>
      <dd class="editor p-author h-card vcard"><a class="p-name fn u-url url" href="https://cure53.de">Mario Heiderich</a> (<span class="p-org org">Cure53</span>) <a class="u-email email" href="mailto:mario@cure53.de">mario@cure53.de</a>
@@ -819,6 +831,7 @@ <h2 class="no-num no-toc no-ref" id="contents">Table of Contents</h2>
       <li><a href="#informative"><span class="secno"></span> <span class="content">Informative References</span></a>
      </ol>
     <li><a href="#idl-index"><span class="secno"></span> <span class="content">IDL Index</span></a>
+    <li><a href="#issues-index"><span class="secno"></span> <span class="content">Issues Index</span></a>
    </ol>
   </nav>
   <main>
@@ -863,9 +876,10 @@ <h3 class="heading settled" data-level="1.2" id="api-summary"><span class="secno
 configuration. The methods come in two by two flavours:</p>
    <ul>
     <li data-md>
-     <p>Safe and unsafe: The "safe" methods will not generate any markup that executes
-script. That is, they should be safe from XSS. The "unsafe" methods will parse
-and filter whatever they’re supposed to.</p>
+     <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="safe-and-unsafe">Safe and unsafe</dfn>: The "safe" methods will not generate any markup that
+executes script. That is, they should be safe from XSS. The "unsafe" methods
+will parse and filter whatever they’re supposed to.
+See also: <a href="#security-considerations">§ 4 Security Considerations</a>.</p>
     <li data-md>
      <p>Context: Methods are defined on <code class="idl"><a data-link-type="idl" href="https://dom.spec.whatwg.org/#element" id="ref-for-element①">Element</a></code> and <code class="idl"><a data-link-type="idl" href="https://dom.spec.whatwg.org/#shadowroot" id="ref-for-shadowroot">ShadowRoot</a></code> and will
 replace these <code class="idl"><a data-link-type="idl" href="https://dom.spec.whatwg.org/#node" id="ref-for-node">Node</a></code>'s children, and are largely analogous to <code class="idl"><a data-link-type="idl" href="https://html.spec.whatwg.org/multipage/dynamic-markup-insertion.html#dom-element-innerhtml" id="ref-for-dom-element-innerhtml①">innerHTML</a></code>.
@@ -942,10 +956,9 @@ <h3 class="heading settled" data-level="2.1" id="sanitizer-api"><span class="sec
      <li data-md>
       <p><a data-link-type="dfn" href="https://html.spec.whatwg.org/#parse-html-from-a-string" id="ref-for-parse-html-from-a-string">Parse HTML from a string</a> given <var>document</var> and <var>compliantHTML</var>.</p>
      <li data-md>
-      <p>Let <var>config</var> be the result of calling <a data-link-type="dfn" href="#sanitizerconfig-get-a-sanitizer-config-from-options" id="ref-for-sanitizerconfig-get-a-sanitizer-config-from-options">get a sanitizer config from options</a> with <var>options</var> and false.</p>
+      <p>Let <var>sanitizer</var> be the result of calling <a data-link-type="dfn" href="#sanitizerconfig-get-a-sanitizer-instance-from-options" id="ref-for-sanitizerconfig-get-a-sanitizer-instance-from-options">get a sanitizer instance from options</a> with <var>options</var>.</p>
      <li data-md>
-      <p>If <var>config</var> is not <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-empty" id="ref-for-list-empty">empty</a>,
- then call <a data-link-type="dfn" href="#sanitize" id="ref-for-sanitize">sanitize</a> on <var>document</var>’s <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#concept-tree-root" id="ref-for-concept-tree-root">root node</a> with <var>config</var>.</p>
+      <p>Call <a data-link-type="dfn" href="#sanitize" id="ref-for-sanitize">sanitize</a> on <var>document</var>’s <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#concept-tree-root" id="ref-for-concept-tree-root">root node</a> with <var>sanitizer</var> and false.</p>
      <li data-md>
       <p>Return <var>document</var>.</p>
     </ol>
@@ -961,9 +974,9 @@ <h3 class="heading settled" data-level="2.1" id="sanitizer-api"><span class="sec
      <li data-md>
       <p><a data-link-type="dfn" href="https://html.spec.whatwg.org/#parse-html-from-a-string" id="ref-for-parse-html-from-a-string①">Parse HTML from a string</a> given <var>document</var> and <var>html</var>.</p>
      <li data-md>
-      <p>Let <var>config</var> be the result of calling <a data-link-type="dfn" href="#sanitizerconfig-get-a-sanitizer-config-from-options" id="ref-for-sanitizerconfig-get-a-sanitizer-config-from-options①">get a sanitizer config from options</a> with <var>options</var> and true.</p>
+      <p>Let <var>sanitizer</var> be the result of calling <a data-link-type="dfn" href="#sanitizerconfig-get-a-sanitizer-instance-from-options" id="ref-for-sanitizerconfig-get-a-sanitizer-instance-from-options①">get a sanitizer instance from options</a> with <var>options</var>.</p>
      <li data-md>
-      <p>Call <a data-link-type="dfn" href="#sanitize" id="ref-for-sanitize①">sanitize</a> on <var>document</var>’s <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#concept-tree-root" id="ref-for-concept-tree-root①">root node</a> with <var>config</var>.</p>
+      <p>Call <a data-link-type="dfn" href="#sanitize" id="ref-for-sanitize①">sanitize</a> on <var>document</var>’s <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#concept-tree-root" id="ref-for-concept-tree-root①">root node</a> with <var>sanitizer</var> and true.</p>
      <li data-md>
       <p>Return <var>document</var>.</p>
     </ol>
@@ -976,43 +989,57 @@ <h3 class="heading settled" data-level="2.2" id="configobject"><span class="secn
 };
 </pre>
    <p>The <code class="idl"><a data-link-type="idl" href="#sanitizer" id="ref-for-sanitizer①">Sanitizer</a></code> configuration object encapsulates a filter configuration.
-The same config can be used with both safe or unsafe methods. The intent is
+The same configuration can be used with both <a data-link-type="dfn" href="#safe-and-unsafe" id="ref-for-safe-and-unsafe">"safe"
+or "unsafe"</a> methods, where the "safe" methods perform an implicit <code class="idl"><a data-link-type="idl" href="#dom-sanitizer-removeunsafe" id="ref-for-dom-sanitizer-removeunsafe">removeUnsafe</a></code> operation on the passed in configuration and have a default
+configuration when none is passed. The intent is
 that one (or a few) configurations will be built-up early on in a page’s
 lifetime, and can then be used whenever needed. This allows implementations
 to pre-process configurations.</p>
-   <p>The configuration object is also query-able and can return <a data-link-type="dfn" href="#sanitizerconfig-canonical" id="ref-for-sanitizerconfig-canonical">canonical</a> configuration dictionaries,
-in both safe and unsafe variants. This allows a
-page to query and predict what effect a given configuration will have, or
-to build a new configuration based on an existing one.</p>
+   <p>The configuration object can be queried to return a configuration dictionary.
+It can also be modified directly.</p>
 <pre class="idl highlight def">[<a class="idl-code" data-link-type="extended-attribute" href="https://webidl.spec.whatwg.org/#Exposed" id="ref-for-Exposed"><c- g>Exposed</c-></a>=(<c- n>Window</c->,<c- n>Worker</c->)]
 <c- b>interface</c-> <dfn class="dfn-paneled idl-code" data-dfn-type="interface" data-export id="sanitizer"><code><c- g>Sanitizer</c-></code></dfn> {
-  <dfn class="dfn-paneled idl-code" data-dfn-for="Sanitizer" data-dfn-type="constructor" data-export data-lt="Sanitizer(config)|constructor(config)|Sanitizer()|constructor()" id="dom-sanitizer-sanitizer"><code><c- g>constructor</c-></code></dfn>(<c- b>optional</c-> <a data-link-type="idl-name" href="#dictdef-sanitizerconfig" id="ref-for-dictdef-sanitizerconfig①"><c- n>SanitizerConfig</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="Sanitizer/Sanitizer(config), Sanitizer/constructor(config), Sanitizer/Sanitizer(), Sanitizer/constructor()" data-dfn-type="argument" data-export id="dom-sanitizer-sanitizer-config-config"><code><c- g>config</c-></code></dfn> = {});
+  <dfn class="dfn-paneled idl-code" data-dfn-for="Sanitizer" data-dfn-type="constructor" data-export data-lt="Sanitizer(configuration)|constructor(configuration)|Sanitizer()|constructor()" id="dom-sanitizer-sanitizer"><code><c- g>constructor</c-></code></dfn>(<c- b>optional</c-> <a data-link-type="idl-name" href="#dictdef-sanitizerconfig" id="ref-for-dictdef-sanitizerconfig①"><c- n>SanitizerConfig</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="Sanitizer/Sanitizer(configuration), Sanitizer/constructor(configuration), Sanitizer/Sanitizer(), Sanitizer/constructor()" data-dfn-type="argument" data-export id="dom-sanitizer-sanitizer-configuration-configuration"><code><c- g>configuration</c-></code></dfn> = {});
+
+  // Query configuration:
   <a data-link-type="idl-name" href="#dictdef-sanitizerconfig" id="ref-for-dictdef-sanitizerconfig②"><c- n>SanitizerConfig</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="Sanitizer" data-dfn-type="method" data-export data-lt="get()" id="dom-sanitizer-get"><code><c- g>get</c-></code></dfn>();
-  <a data-link-type="idl-name" href="#dictdef-sanitizerconfig" id="ref-for-dictdef-sanitizerconfig③"><c- n>SanitizerConfig</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="Sanitizer" data-dfn-type="method" data-export data-lt="getUnsafe()" id="dom-sanitizer-getunsafe"><code><c- g>getUnsafe</c-></code></dfn>();
+
+  // Modify a Sanitizer’s lists and fields:
+  <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-undefined" id="ref-for-idl-undefined④"><c- b>undefined</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="Sanitizer" data-dfn-type="method" data-export data-lt="allowElement(element)" id="dom-sanitizer-allowelement"><code><c- g>allowElement</c-></code></dfn>(<a data-link-type="idl-name" href="#typedefdef-sanitizerelementwithattributes" id="ref-for-typedefdef-sanitizerelementwithattributes"><c- n>SanitizerElementWithAttributes</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="Sanitizer/allowElement(element)" data-dfn-type="argument" data-export id="dom-sanitizer-allowelement-element-element"><code><c- g>element</c-></code></dfn>);
+  <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-undefined" id="ref-for-idl-undefined⑤"><c- b>undefined</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="Sanitizer" data-dfn-type="method" data-export data-lt="removeElement(element)" id="dom-sanitizer-removeelement"><code><c- g>removeElement</c-></code></dfn>(<a data-link-type="idl-name" href="#typedefdef-sanitizerelement" id="ref-for-typedefdef-sanitizerelement"><c- n>SanitizerElement</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="Sanitizer/removeElement(element)" data-dfn-type="argument" data-export id="dom-sanitizer-removeelement-element-element"><code><c- g>element</c-></code></dfn>);
+  <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-undefined" id="ref-for-idl-undefined⑥"><c- b>undefined</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="Sanitizer" data-dfn-type="method" data-export data-lt="replaceElementWithChildren(element)" id="dom-sanitizer-replaceelementwithchildren"><code><c- g>replaceElementWithChildren</c-></code></dfn>(<a data-link-type="idl-name" href="#typedefdef-sanitizerelement" id="ref-for-typedefdef-sanitizerelement①"><c- n>SanitizerElement</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="Sanitizer/replaceElementWithChildren(element)" data-dfn-type="argument" data-export id="dom-sanitizer-replaceelementwithchildren-element-element"><code><c- g>element</c-></code></dfn>);
+  <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-undefined" id="ref-for-idl-undefined⑦"><c- b>undefined</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="Sanitizer" data-dfn-type="method" data-export data-lt="allowAttribute(attribute)" id="dom-sanitizer-allowattribute"><code><c- g>allowAttribute</c-></code></dfn>(<a data-link-type="idl-name" href="#typedefdef-sanitizerattribute" id="ref-for-typedefdef-sanitizerattribute"><c- n>SanitizerAttribute</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="Sanitizer/allowAttribute(attribute)" data-dfn-type="argument" data-export id="dom-sanitizer-allowattribute-attribute-attribute"><code><c- g>attribute</c-></code></dfn>);
+  <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-undefined" id="ref-for-idl-undefined⑧"><c- b>undefined</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="Sanitizer" data-dfn-type="method" data-export data-lt="removeAttribute(attribute)" id="dom-sanitizer-removeattribute"><code><c- g>removeAttribute</c-></code></dfn>(<a data-link-type="idl-name" href="#typedefdef-sanitizerattribute" id="ref-for-typedefdef-sanitizerattribute①"><c- n>SanitizerAttribute</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="Sanitizer/removeAttribute(attribute)" data-dfn-type="argument" data-export id="dom-sanitizer-removeattribute-attribute-attribute"><code><c- g>attribute</c-></code></dfn>);
+  <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-undefined" id="ref-for-idl-undefined⑨"><c- b>undefined</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="Sanitizer" data-dfn-type="method" data-export data-lt="setComments(allow)" id="dom-sanitizer-setcomments"><code><c- g>setComments</c-></code></dfn>(<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-boolean" id="ref-for-idl-boolean"><c- b>boolean</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="Sanitizer/setComments(allow)" data-dfn-type="argument" data-export id="dom-sanitizer-setcomments-allow-allow"><code><c- g>allow</c-></code></dfn>);
+  <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-undefined" id="ref-for-idl-undefined①⓪"><c- b>undefined</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="Sanitizer" data-dfn-type="method" data-export data-lt="setDataAttributes(allow)" id="dom-sanitizer-setdataattributes"><code><c- g>setDataAttributes</c-></code></dfn>(<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-boolean" id="ref-for-idl-boolean①"><c- b>boolean</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="Sanitizer/setDataAttributes(allow)" data-dfn-type="argument" data-export id="dom-sanitizer-setdataattributes-allow-allow"><code><c- g>allow</c-></code></dfn>);
+
+  // Remove markup that executes script. May modify multiple lists:
+  <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-undefined" id="ref-for-idl-undefined①①"><c- b>undefined</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="Sanitizer" data-dfn-type="method" data-export data-lt="removeUnsafe()" id="dom-sanitizer-removeunsafe"><code><c- g>removeUnsafe</c-></code></dfn>();
 };
 </pre>
+   <p class="note" role="note"><span class="marker">Note:</span> <code class="idl"><a data-link-type="idl" href="#sanitizer" id="ref-for-sanitizer②">Sanitizer</a></code> will likely get an additional method: <br><code>[NewObject] static Sanitizer getDefault();</code></p>
+   <p>A <code class="idl"><a data-link-type="idl" href="#sanitizer" id="ref-for-sanitizer③">Sanitizer</a></code> has an associated <dfn class="dfn-paneled" data-dfn-for="Sanitizer" data-dfn-type="dfn" data-noexport id="sanitizer-configuration">configuration</dfn>, a <code class="idl"><a data-link-type="idl" href="#dictdef-sanitizerconfig" id="ref-for-dictdef-sanitizerconfig③">SanitizerConfig</a></code>.</p>
    <div class="algorithm" data-algorithm="constructor" data-algorithm-for="Sanitizer">
-     The <dfn class="dfn-paneled" data-dfn-for="Sanitizer" data-dfn-type="dfn" data-export id="sanitizer-constructor">constructor</dfn>(<var>config</var>)
+     The <dfn class="dfn-paneled" data-dfn-for="Sanitizer" data-dfn-type="dfn" data-export id="sanitizer-constructor">constructor</dfn>(<var>configuration</var>)
 method steps are: 
     <ol>
      <li data-md>
-      <p>Store <var>config</var> in <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#this" id="ref-for-this①⑤">this</a>'s <a data-link-type="dfn" href="https://tc39.es/ecma262/#sec-ordinary-object-internal-methods-and-internal-slots" id="ref-for-sec-ordinary-object-internal-methods-and-internal-slots">internal slot</a>.</p>
-    </ol>
-   </div>
-   <div class="algorithm" data-algorithm="get" data-algorithm-for="Sanitizer">
-     The <dfn class="dfn-paneled" data-dfn-for="Sanitizer" data-dfn-type="dfn" data-export id="sanitizer-get">get</dfn>() method steps are: 
-    <ol>
+      <p>Let <var>valid</var> be the return value of <a data-link-type="dfn" href="#sanitizer-set-a-configuration" id="ref-for-sanitizer-set-a-configuration">setting</a> <var>configuration</var> on <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#this" id="ref-for-this①⑤">this</a>.</p>
      <li data-md>
-      <p>Return the result of <a data-link-type="dfn" href="#canonicalize-a-configuration" id="ref-for-canonicalize-a-configuration">canonicalize a configuration</a> with the value of <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#this" id="ref-for-this①⑥">this</a>'s <a data-link-type="dfn" href="https://tc39.es/ecma262/#sec-ordinary-object-internal-methods-and-internal-slots" id="ref-for-sec-ordinary-object-internal-methods-and-internal-slots①">internal slot</a> and true.</p>
-    </ol>
-   </div>
-   <div class="algorithm" data-algorithm="getUnsafe" data-algorithm-for="Sanitizer">
-     The <dfn class="dfn-paneled" data-dfn-for="Sanitizer" data-dfn-type="dfn" data-export id="sanitizer-getunsafe">getUnsafe</dfn>() method steps are: 
-    <ol>
-     <li data-md>
-      <p>Return the result of <a data-link-type="dfn" href="#canonicalize-a-configuration" id="ref-for-canonicalize-a-configuration①">canonicalize a configuration</a> with the value of <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#this" id="ref-for-this①⑦">this</a>'s <a data-link-type="dfn" href="https://tc39.es/ecma262/#sec-ordinary-object-internal-methods-and-internal-slots" id="ref-for-sec-ordinary-object-internal-methods-and-internal-slots②">internal slot</a> and false.</p>
+      <p>If <var>valid</var> is false, then throw a <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#exceptiondef-typeerror" id="ref-for-exceptiondef-typeerror">TypeError</a></code>.</p>
     </ol>
    </div>
+   <div class="algorithm" data-algorithm="get" data-algorithm-for="Sanitizer"> The <dfn class="dfn-paneled" data-dfn-for="Sanitizer" data-dfn-type="dfn" data-export id="sanitizer-get">get</dfn>() method steps are to return the value of <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#this" id="ref-for-this①⑥">this</a>'s <a data-link-type="dfn" href="#sanitizer-configuration" id="ref-for-sanitizer-configuration">configuration</a>. </div>
+   <div class="algorithm" data-algorithm="allowElement" data-algorithm-for="Sanitizer"> The <dfn class="dfn-paneled" data-dfn-for="Sanitizer" data-dfn-type="dfn" data-export id="sanitizer-allowelement">allowElement</dfn>(<var>element</var>) method steps are to <a data-link-type="dfn" href="#sanitizerconfig-allow-an-element" id="ref-for-sanitizerconfig-allow-an-element">allow an element</a> with <var>element</var> and <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#this" id="ref-for-this①⑦">this</a>'s <a data-link-type="dfn" href="#sanitizer-configuration" id="ref-for-sanitizer-configuration①">configuration</a>. </div>
+   <div class="algorithm" data-algorithm="removeElement" data-algorithm-for="Sanitizer"> The <dfn class="dfn-paneled" data-dfn-for="Sanitizer" data-dfn-type="dfn" data-export id="sanitizer-removeelement">removeElement</dfn>(<var>element</var>) method steps are
+to <a data-link-type="dfn" href="#sanitizer-remove-an-element" id="ref-for-sanitizer-remove-an-element">remove an element</a> with <var>element</var> and <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#this" id="ref-for-this①⑧">this</a>'s <a data-link-type="dfn" href="#sanitizer-configuration" id="ref-for-sanitizer-configuration②">configuration</a>. </div>
+   <div class="algorithm" data-algorithm="replaceElementWithChildren" data-algorithm-for="Sanitizer"> The <dfn class="dfn-paneled" data-dfn-for="Sanitizer" data-dfn-type="dfn" data-export id="sanitizer-replaceelementwithchildren">replaceElementWithChildren</dfn>(<var>element</var>) method steps are to <a data-link-type="dfn" href="#sanitizer-replace-an-element-with-its-children" id="ref-for-sanitizer-replace-an-element-with-its-children">replace an element with its children</a> with <var>element</var> and <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#this" id="ref-for-this①⑨">this</a>'s <a data-link-type="dfn" href="#sanitizer-configuration" id="ref-for-sanitizer-configuration③">configuration</a>. </div>
+   <div class="algorithm" data-algorithm="allowAttribute" data-algorithm-for="Sanitizer"> The <dfn class="dfn-paneled" data-dfn-for="Sanitizer" data-dfn-type="dfn" data-export id="sanitizer-allowattribute">allowAttribute</dfn>(<var>attribute</var>) method steps are to <a data-link-type="dfn" href="#sanitizer-allow-an-attribute" id="ref-for-sanitizer-allow-an-attribute">allow an attribute</a> with <var>attribute</var> and <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#this" id="ref-for-this②⓪">this</a>'s <a data-link-type="dfn" href="#sanitizer-configuration" id="ref-for-sanitizer-configuration④">configuration</a>. </div>
+   <div class="algorithm" data-algorithm="removeAttribute" data-algorithm-for="Sanitizer"> The <dfn class="dfn-paneled" data-dfn-for="Sanitizer" data-dfn-type="dfn" data-export id="sanitizer-removeattribute">removeAttribute</dfn>(<var>attribute</var>) method steps are to <a data-link-type="dfn" href="#sanitizer-remove-an-attribute" id="ref-for-sanitizer-remove-an-attribute">remove an attribute</a> with <var>attribute</var> and <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#this" id="ref-for-this②①">this</a>'s <a data-link-type="dfn" href="#sanitizer-configuration" id="ref-for-sanitizer-configuration⑤">configuration</a>. </div>
+   <div class="algorithm" data-algorithm="setComments" data-algorithm-for="Sanitizer"> The <dfn class="dfn-paneled" data-dfn-for="Sanitizer" data-dfn-type="dfn" data-export id="sanitizer-setcomments">setComments</dfn>(<var>allow</var>) method steps to <a data-link-type="dfn" href="#sanitizer-set-comments" id="ref-for-sanitizer-set-comments">set comments</a> with <var>allow</var> and <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#this" id="ref-for-this②②">this</a>'s <a data-link-type="dfn" href="#sanitizer-configuration" id="ref-for-sanitizer-configuration⑥">configuration</a>. </div>
+   <div class="algorithm" data-algorithm="setDataAttributes" data-algorithm-for="Sanitizer"> The <dfn class="dfn-paneled" data-dfn-for="Sanitizer" data-dfn-type="dfn" data-export id="sanitizer-setdataattributes">setDataAttributes</dfn>(<var>allow</var>) method steps are to <a data-link-type="dfn" href="#sanitizer-set-data-attributes" id="ref-for-sanitizer-set-data-attributes">set data attributes</a> with <var>allow</var> and <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#this" id="ref-for-this②③">this</a>'s <a data-link-type="dfn" href="#sanitizer-configuration" id="ref-for-sanitizer-configuration⑦">configuration</a>. </div>
+   <div class="algorithm" data-algorithm="removeUnsafe" data-algorithm-for="Sanitizer"> The <dfn class="dfn-paneled" data-dfn-for="Sanitizer" data-dfn-type="dfn" data-export id="sanitizer-removeunsafe">removeUnsafe</dfn>() method steps are to
+update <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#this" id="ref-for-this②④">this</a>'s <a data-link-type="dfn" href="#sanitizer-configuration" id="ref-for-sanitizer-configuration⑧">configuration</a> with the result of calling <a data-link-type="dfn" href="#sanitizerconfig-remove-unsafe" id="ref-for-sanitizerconfig-remove-unsafe">remove unsafe</a> on <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#this" id="ref-for-this②⑤">this</a>'s <a data-link-type="dfn" href="#sanitizer-configuration" id="ref-for-sanitizer-configuration⑨">configuration</a>. </div>
    <h3 class="heading settled" data-level="2.3" id="config"><span class="secno">2.3. </span><span class="content">The Configuration Dictionary</span><a class="self-link" href="#config"></a></h3>
 <pre class="idl highlight def"><c- b>dictionary</c-> <dfn class="dfn-paneled idl-code" data-dfn-type="dictionary" data-export id="dictdef-sanitizerelementnamespace"><code><c- g>SanitizerElementNamespace</c-></code></dfn> {
   <c- b>required</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString⑦"><c- b>DOMString</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="SanitizerElementNamespace" data-dfn-type="dict-member" data-export data-type="DOMString" id="dom-sanitizerelementnamespace-name"><code><c- g>name</c-></code></dfn>;
@@ -1021,8 +1048,8 @@ <h3 class="heading settled" data-level="2.3" id="config"><span class="secno">2.3
 
 // Used by "elements"
 <c- b>dictionary</c-> <dfn class="dfn-paneled idl-code" data-dfn-type="dictionary" data-export id="dictdef-sanitizerelementnamespacewithattributes"><code><c- g>SanitizerElementNamespaceWithAttributes</c-></code></dfn> : <a data-link-type="idl-name" href="#dictdef-sanitizerelementnamespace" id="ref-for-dictdef-sanitizerelementnamespace"><c- n>SanitizerElementNamespace</c-></a> {
-  <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#idl-sequence" id="ref-for-idl-sequence"><c- b>sequence</c-></a>&lt;<a data-link-type="idl-name" href="#typedefdef-sanitizerattribute" id="ref-for-typedefdef-sanitizerattribute"><c- n>SanitizerAttribute</c-></a>> <dfn class="dfn-paneled idl-code" data-dfn-for="SanitizerElementNamespaceWithAttributes" data-dfn-type="dict-member" data-export data-type="sequence<SanitizerAttribute>" id="dom-sanitizerelementnamespacewithattributes-attributes"><code><c- g>attributes</c-></code></dfn>;
-  <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#idl-sequence" id="ref-for-idl-sequence①"><c- b>sequence</c-></a>&lt;<a data-link-type="idl-name" href="#typedefdef-sanitizerattribute" id="ref-for-typedefdef-sanitizerattribute①"><c- n>SanitizerAttribute</c-></a>> <dfn class="dfn-paneled idl-code" data-dfn-for="SanitizerElementNamespaceWithAttributes" data-dfn-type="dict-member" data-export data-type="sequence<SanitizerAttribute>" id="dom-sanitizerelementnamespacewithattributes-removeattributes"><code><c- g>removeAttributes</c-></code></dfn>;
+  <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#idl-sequence" id="ref-for-idl-sequence"><c- b>sequence</c-></a>&lt;<a data-link-type="idl-name" href="#typedefdef-sanitizerattribute" id="ref-for-typedefdef-sanitizerattribute②"><c- n>SanitizerAttribute</c-></a>> <dfn class="dfn-paneled idl-code" data-dfn-for="SanitizerElementNamespaceWithAttributes" data-dfn-type="dict-member" data-export data-type="sequence<SanitizerAttribute>" id="dom-sanitizerelementnamespacewithattributes-attributes"><code><c- g>attributes</c-></code></dfn>;
+  <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#idl-sequence" id="ref-for-idl-sequence①"><c- b>sequence</c-></a>&lt;<a data-link-type="idl-name" href="#typedefdef-sanitizerattribute" id="ref-for-typedefdef-sanitizerattribute③"><c- n>SanitizerAttribute</c-></a>> <dfn class="dfn-paneled idl-code" data-dfn-for="SanitizerElementNamespaceWithAttributes" data-dfn-type="dict-member" data-export data-type="sequence<SanitizerAttribute>" id="dom-sanitizerelementnamespacewithattributes-removeattributes"><code><c- g>removeAttributes</c-></code></dfn>;
 };
 
 <c- b>typedef</c-> (<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString⑨"><c- b>DOMString</c-></a> <c- b>or</c-> <a data-link-type="idl-name" href="#dictdef-sanitizerelementnamespace" id="ref-for-dictdef-sanitizerelementnamespace①"><c- n>SanitizerElementNamespace</c-></a>) <dfn class="dfn-paneled idl-code" data-dfn-type="typedef" data-export id="typedefdef-sanitizerelement"><code><c- g>SanitizerElement</c-></code></dfn>;
@@ -1035,15 +1062,15 @@ <h3 class="heading settled" data-level="2.3" id="config"><span class="secno">2.3
 <c- b>typedef</c-> (<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString①③"><c- b>DOMString</c-></a> <c- b>or</c-> <a data-link-type="idl-name" href="#dictdef-sanitizerattributenamespace" id="ref-for-dictdef-sanitizerattributenamespace"><c- n>SanitizerAttributeNamespace</c-></a>) <dfn class="dfn-paneled idl-code" data-dfn-type="typedef" data-export id="typedefdef-sanitizerattribute"><code><c- g>SanitizerAttribute</c-></code></dfn>;
 
 <c- b>dictionary</c-> <dfn class="dfn-paneled idl-code" data-dfn-type="dictionary" data-export id="dictdef-sanitizerconfig"><code><c- g>SanitizerConfig</c-></code></dfn> {
-  <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#idl-sequence" id="ref-for-idl-sequence②"><c- b>sequence</c-></a>&lt;<a data-link-type="idl-name" href="#typedefdef-sanitizerelementwithattributes" id="ref-for-typedefdef-sanitizerelementwithattributes"><c- n>SanitizerElementWithAttributes</c-></a>> <dfn class="dfn-paneled idl-code" data-dfn-for="SanitizerConfig" data-dfn-type="dict-member" data-export data-type="sequence<SanitizerElementWithAttributes>" id="dom-sanitizerconfig-elements"><code><c- g>elements</c-></code></dfn>;
-  <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#idl-sequence" id="ref-for-idl-sequence③"><c- b>sequence</c-></a>&lt;<a data-link-type="idl-name" href="#typedefdef-sanitizerelement" id="ref-for-typedefdef-sanitizerelement"><c- n>SanitizerElement</c-></a>> <dfn class="dfn-paneled idl-code" data-dfn-for="SanitizerConfig" data-dfn-type="dict-member" data-export data-type="sequence<SanitizerElement>" id="dom-sanitizerconfig-removeelements"><code><c- g>removeElements</c-></code></dfn>;
-  <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#idl-sequence" id="ref-for-idl-sequence④"><c- b>sequence</c-></a>&lt;<a data-link-type="idl-name" href="#typedefdef-sanitizerelement" id="ref-for-typedefdef-sanitizerelement①"><c- n>SanitizerElement</c-></a>> <dfn class="dfn-paneled idl-code" data-dfn-for="SanitizerConfig" data-dfn-type="dict-member" data-export data-type="sequence<SanitizerElement>" id="dom-sanitizerconfig-replacewithchildrenelements"><code><c- g>replaceWithChildrenElements</c-></code></dfn>;
+  <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#idl-sequence" id="ref-for-idl-sequence②"><c- b>sequence</c-></a>&lt;<a data-link-type="idl-name" href="#typedefdef-sanitizerelementwithattributes" id="ref-for-typedefdef-sanitizerelementwithattributes①"><c- n>SanitizerElementWithAttributes</c-></a>> <dfn class="dfn-paneled idl-code" data-dfn-for="SanitizerConfig" data-dfn-type="dict-member" data-export data-type="sequence<SanitizerElementWithAttributes>" id="dom-sanitizerconfig-elements"><code><c- g>elements</c-></code></dfn>;
+  <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#idl-sequence" id="ref-for-idl-sequence③"><c- b>sequence</c-></a>&lt;<a data-link-type="idl-name" href="#typedefdef-sanitizerelement" id="ref-for-typedefdef-sanitizerelement②"><c- n>SanitizerElement</c-></a>> <dfn class="dfn-paneled idl-code" data-dfn-for="SanitizerConfig" data-dfn-type="dict-member" data-export data-type="sequence<SanitizerElement>" id="dom-sanitizerconfig-removeelements"><code><c- g>removeElements</c-></code></dfn>;
+  <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#idl-sequence" id="ref-for-idl-sequence④"><c- b>sequence</c-></a>&lt;<a data-link-type="idl-name" href="#typedefdef-sanitizerelement" id="ref-for-typedefdef-sanitizerelement③"><c- n>SanitizerElement</c-></a>> <dfn class="dfn-paneled idl-code" data-dfn-for="SanitizerConfig" data-dfn-type="dict-member" data-export data-type="sequence<SanitizerElement>" id="dom-sanitizerconfig-replacewithchildrenelements"><code><c- g>replaceWithChildrenElements</c-></code></dfn>;
 
-  <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#idl-sequence" id="ref-for-idl-sequence⑤"><c- b>sequence</c-></a>&lt;<a data-link-type="idl-name" href="#typedefdef-sanitizerattribute" id="ref-for-typedefdef-sanitizerattribute②"><c- n>SanitizerAttribute</c-></a>> <dfn class="dfn-paneled idl-code" data-dfn-for="SanitizerConfig" data-dfn-type="dict-member" data-export data-type="sequence<SanitizerAttribute>" id="dom-sanitizerconfig-attributes"><code><c- g>attributes</c-></code></dfn>;
-  <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#idl-sequence" id="ref-for-idl-sequence⑥"><c- b>sequence</c-></a>&lt;<a data-link-type="idl-name" href="#typedefdef-sanitizerattribute" id="ref-for-typedefdef-sanitizerattribute③"><c- n>SanitizerAttribute</c-></a>> <dfn class="dfn-paneled idl-code" data-dfn-for="SanitizerConfig" data-dfn-type="dict-member" data-export data-type="sequence<SanitizerAttribute>" id="dom-sanitizerconfig-removeattributes"><code><c- g>removeAttributes</c-></code></dfn>;
+  <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#idl-sequence" id="ref-for-idl-sequence⑤"><c- b>sequence</c-></a>&lt;<a data-link-type="idl-name" href="#typedefdef-sanitizerattribute" id="ref-for-typedefdef-sanitizerattribute④"><c- n>SanitizerAttribute</c-></a>> <dfn class="dfn-paneled idl-code" data-dfn-for="SanitizerConfig" data-dfn-type="dict-member" data-export data-type="sequence<SanitizerAttribute>" id="dom-sanitizerconfig-attributes"><code><c- g>attributes</c-></code></dfn>;
+  <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#idl-sequence" id="ref-for-idl-sequence⑥"><c- b>sequence</c-></a>&lt;<a data-link-type="idl-name" href="#typedefdef-sanitizerattribute" id="ref-for-typedefdef-sanitizerattribute⑤"><c- n>SanitizerAttribute</c-></a>> <dfn class="dfn-paneled idl-code" data-dfn-for="SanitizerConfig" data-dfn-type="dict-member" data-export data-type="sequence<SanitizerAttribute>" id="dom-sanitizerconfig-removeattributes"><code><c- g>removeAttributes</c-></code></dfn>;
 
-  <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-boolean" id="ref-for-idl-boolean"><c- b>boolean</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="SanitizerConfig" data-dfn-type="dict-member" data-export data-type="boolean" id="dom-sanitizerconfig-comments"><code><c- g>comments</c-></code></dfn>;
-  <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-boolean" id="ref-for-idl-boolean①"><c- b>boolean</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="SanitizerConfig" data-dfn-type="dict-member" data-export data-type="boolean" id="dom-sanitizerconfig-dataattributes"><code><c- g>dataAttributes</c-></code></dfn>;
+  <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-boolean" id="ref-for-idl-boolean②"><c- b>boolean</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="SanitizerConfig" data-dfn-type="dict-member" data-export data-type="boolean" id="dom-sanitizerconfig-comments"><code><c- g>comments</c-></code></dfn>;
+  <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-boolean" id="ref-for-idl-boolean③"><c- b>boolean</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="SanitizerConfig" data-dfn-type="dict-member" data-export data-type="boolean" id="dom-sanitizerconfig-dataattributes"><code><c- g>dataAttributes</c-></code></dfn>;
 };
 </pre>
    <h2 class="heading settled" data-level="3" id="algorithms"><span class="secno">3. </span><span class="content">Algorithms</span><a class="self-link" href="#algorithms"></a></h2>
@@ -1053,7 +1080,7 @@ <h2 class="heading settled" data-level="3" id="algorithms"><span class="secno">3
      <li data-md>
       <p>If <var>safe</var> and <var>contextElement</var>’s <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#concept-element-local-name" id="ref-for-concept-element-local-name">local name</a> is "<code>script</code>" and <var>contextElement</var>’s <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#concept-element-namespace" id="ref-for-concept-element-namespace">namespace</a> is the <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#html-namespace" id="ref-for-html-namespace">HTML namespace</a> or the <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#svg-namespace" id="ref-for-svg-namespace">SVG namespace</a>, then return.</p>
      <li data-md>
-      <p>Let <var>config</var> be the result of calling <a data-link-type="dfn" href="#sanitizerconfig-get-a-sanitizer-config-from-options" id="ref-for-sanitizerconfig-get-a-sanitizer-config-from-options②">get a sanitizer config from options</a> with <var>options</var> and <var>safe</var>.</p>
+      <p>Let <var>sanitizer</var> be the result of calling <a data-link-type="dfn" href="#sanitizerconfig-get-a-sanitizer-instance-from-options" id="ref-for-sanitizerconfig-get-a-sanitizer-instance-from-options②">get a sanitizer instance from options</a> with <var>options</var>.</p>
      <li data-md>
       <p>Let <var>newChildren</var> be the result of the HTML <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/dynamic-markup-insertion.html#fragment-parsing-algorithm-steps" id="ref-for-fragment-parsing-algorithm-steps">fragment parsing algorithm steps</a> given <var>contextElement</var>, <var>html</var>, and true.</p>
      <li data-md>
@@ -1061,47 +1088,72 @@ <h2 class="heading settled" data-level="3" id="algorithms"><span class="secno">3
      <li data-md>
       <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-iterate" id="ref-for-list-iterate">For each</a> <var>node</var> in <var>newChildren</var>, <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-append" id="ref-for-list-append">append</a> <var>node</var> to <var>fragment</var>.</p>
      <li data-md>
-      <p>If <var>config</var> is not <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-empty" id="ref-for-list-empty①">empty</a>, then run <a data-link-type="dfn" href="#sanitize" id="ref-for-sanitize②">sanitize</a> on <var>fragment</var> using <var>config</var>.</p>
+      <p>Run <a data-link-type="dfn" href="#sanitize" id="ref-for-sanitize②">sanitize</a> on <var>fragment</var> using <var>sanitizer</var> and <var>safe</var>.</p>
      <li data-md>
       <p><a data-link-type="dfn" href="https://dom.spec.whatwg.org/#concept-node-replace-all" id="ref-for-concept-node-replace-all">Replace all</a> with <var>fragment</var> within <var>target</var>.</p>
     </ol>
    </div>
-   <div class="algorithm" data-algorithm="get a sanitizer config from options" data-algorithm-for="SanitizerConfig">
-     To <dfn class="dfn-paneled" data-dfn-for="SanitizerConfig" data-dfn-type="dfn" data-noexport id="sanitizerconfig-get-a-sanitizer-config-from-options">get a sanitizer config from options</dfn> for
-an options dictionary <var>options</var> and a boolean <var>safe</var>, do: 
+   <div class="algorithm" data-algorithm="get a sanitizer instance from options" data-algorithm-for="SanitizerConfig">
+     To <dfn class="dfn-paneled" data-dfn-for="SanitizerConfig" data-dfn-type="dfn" data-noexport id="sanitizerconfig-get-a-sanitizer-instance-from-options">get a sanitizer instance from options</dfn> for
+an options dictionary <var>options</var>, do: 
     <ol>
      <li data-md>
-      <p class="assertion">Assert: <var>options</var> is a <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#dfn-dictionary" id="ref-for-dfn-dictionary①">dictionary</a>.</p>
+      <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#assert" id="ref-for-assert">Assert</a>: <var>options</var> is a <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#dfn-dictionary" id="ref-for-dfn-dictionary①">dictionary</a>.</p>
      <li data-md>
-      <p>If <var>options</var>["<code>sanitizer</code>"] doesn’t <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#map-exists" id="ref-for-map-exists">exist</a>, then return undefined.</p>
-     <li data-md>
-      <p class="assertion">Assert: <var>options</var>["<code>sanitizer</code>"] is either a <code class="idl"><a data-link-type="idl" href="#sanitizer" id="ref-for-sanitizer②">Sanitizer</a></code> instance
- or a <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#dfn-dictionary" id="ref-for-dfn-dictionary②">dictionary</a>.</p>
-     <li data-md>
-      <p>If <var>options</var>["<code>sanitizer</code>"] is a <code class="idl"><a data-link-type="idl" href="#sanitizer" id="ref-for-sanitizer③">Sanitizer</a></code> instance:</p>
+      <p>If <var>options</var>["<code>sanitizer</code>"] doesn’t <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#map-exists" id="ref-for-map-exists">exist</a>, then:</p>
       <ol>
        <li data-md>
-        <p>Then let <var>config</var> be the value of <var>options</var>["<code>sanitizer</code>"]'s <a data-link-type="dfn" href="https://tc39.es/ecma262/#sec-ordinary-object-internal-methods-and-internal-slots" id="ref-for-sec-ordinary-object-internal-methods-and-internal-slots③">internal slot</a>.</p>
+        <p>Let <var>result</var> be a new <code class="idl"><a data-link-type="idl" href="#sanitizer" id="ref-for-sanitizer④">Sanitizer</a></code> instance.</p>
+       <li data-md>
+        <p>Let <var>setConfigurationResult</var> be the result of <a data-link-type="dfn" href="#sanitizer-set-a-configuration" id="ref-for-sanitizer-set-a-configuration①">set a configuration</a> with an empty <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#dfn-dictionary" id="ref-for-dfn-dictionary②">dictionary</a> on <var>result</var>.</p>
        <li data-md>
-        <p>Otherwise let <var>config</var> be the value of <var>options</var>["<code>sanitizer</code>"].</p>
+        <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#assert" id="ref-for-assert①">Assert</a>: The <var>setConfigurationResult</var> is true.</p>
+       <li data-md>
+        <p>Return <var>result</var>.</p>
       </ol>
      <li data-md>
-      <p>Return the result of calling <a data-link-type="dfn" href="#canonicalize-a-configuration" id="ref-for-canonicalize-a-configuration②">canonicalize a configuration</a> on <var>config</var> and <var>safe</var>.</p>
+      <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#assert" id="ref-for-assert②">Assert</a>: <var>options</var>["<code>sanitizer</code>"] is either a <code class="idl"><a data-link-type="idl" href="#sanitizer" id="ref-for-sanitizer⑤">Sanitizer</a></code> instance
+ or a <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#dfn-dictionary" id="ref-for-dfn-dictionary③">dictionary</a>.</p>
+     <li data-md>
+      <p>If <var>options</var>["<code>sanitizer</code>"] is a <code class="idl"><a data-link-type="idl" href="#sanitizer" id="ref-for-sanitizer⑥">Sanitizer</a></code> instance:
+ Then return <var>options</var>["<code>sanitizer</code>"].</p>
+     <li data-md>
+      <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#assert" id="ref-for-assert③">Assert</a>: <var>options</var>["<code>sanitizer</code>"] is a <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#dfn-dictionary" id="ref-for-dfn-dictionary④">dictionary</a>.</p>
+     <li data-md>
+      <p>Let <var>result</var> be a new <code class="idl"><a data-link-type="idl" href="#sanitizer" id="ref-for-sanitizer⑦">Sanitizer</a></code> instance.</p>
+     <li data-md>
+      <p>Call <a data-link-type="dfn" href="#sanitizer-set-a-configuration" id="ref-for-sanitizer-set-a-configuration②">set a configuration</a> with <var>options</var>["<code>sanitizer</code>"].</p>
+     <li data-md>
+      <p>If <a data-link-type="dfn" href="#sanitizer-set-a-configuration" id="ref-for-sanitizer-set-a-configuration③">set a configuration</a> returned false, <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#dfn-throw" id="ref-for-dfn-throw">throw</a> a <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#exceptiondef-typeerror" id="ref-for-exceptiondef-typeerror①">TypeError</a></code>.</p>
+     <li data-md>
+      <p>Otherwise, return <var>result</var>.</p>
     </ol>
    </div>
    <h3 class="heading settled" data-level="3.1" id="sanitization"><span class="secno">3.1. </span><span class="content">Sanitization Algorithms</span><a class="self-link" href="#sanitization"></a></h3>
    <div class="algorithm" data-algorithm="sanitize">
-     For the main <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="sanitize">sanitize</dfn> operation, using a <code class="idl"><a data-link-type="idl" href="https://dom.spec.whatwg.org/#parentnode" id="ref-for-parentnode">ParentNode</a></code> <var>node</var>, a <a data-link-type="dfn" href="#sanitizerconfig-canonical" id="ref-for-sanitizerconfig-canonical①">canonical</a> <code class="idl"><a data-link-type="idl" href="#dictdef-sanitizerconfig" id="ref-for-dictdef-sanitizerconfig④">SanitizerConfig</a></code> <var>config</var>, run these steps: 
+     For the main <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="sanitize">sanitize</dfn> operation, using a <code class="idl"><a data-link-type="idl" href="https://dom.spec.whatwg.org/#parentnode" id="ref-for-parentnode">ParentNode</a></code> <var>node</var>, a <code class="idl"><a data-link-type="idl" href="#sanitizer" id="ref-for-sanitizer⑧">Sanitizer</a></code> <var>sanitizer</var>, and a <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#boolean" id="ref-for-boolean①">boolean</a> <var>safe</var>, run these steps: 
     <ol>
      <li data-md>
-      <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#assert" id="ref-for-assert">Assert</a>: <var>config</var> is <a data-link-type="dfn" href="#sanitizerconfig-canonical" id="ref-for-sanitizerconfig-canonical②">canonical</a>.</p>
+      <p>Let <var>configuration</var> be the value of <var>sanitizer</var>’s <a data-link-type="dfn" href="#sanitizer-configuration" id="ref-for-sanitizer-configuration①⓪">configuration</a>.</p>
+     <li data-md>
+      <p>If <var>safe</var> is true, then set <var>configuration</var> to the result of calling <a data-link-type="dfn" href="#sanitizerconfig-remove-unsafe" id="ref-for-sanitizerconfig-remove-unsafe①">remove unsafe</a> on <var>configuration</var>.</p>
+     <li data-md>
+      <p>Call <a data-link-type="dfn" href="#sanitize-core" id="ref-for-sanitize-core">sanitize core</a> on <var>node</var>, <var>configuration</var>, and with <a data-link-type="dfn" href="#handlejavascriptnavigationurls" id="ref-for-handlejavascriptnavigationurls">handleJavascriptNavigationUrls</a> set to <var>safe</var>.</p>
+    </ol>
+   </div>
+   <div class="algorithm" data-algorithm="sanitize core">
+     The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="sanitize-core">sanitize core</dfn> operation,
+using a <code class="idl"><a data-link-type="idl" href="https://dom.spec.whatwg.org/#parentnode" id="ref-for-parentnode①">ParentNode</a></code> <var>node</var>, a <code class="idl"><a data-link-type="idl" href="#dictdef-sanitizerconfig" id="ref-for-dictdef-sanitizerconfig④">SanitizerConfig</a></code> <var>configuration</var>, and a <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#boolean" id="ref-for-boolean②">boolean</a> <var><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="handlejavascriptnavigationurls">handleJavascriptNavigationUrls</dfn></var>, iterates over the DOM tree
+beginning with <var>node</var>, and may recurse to handle some special cases (e.g.
+template contents). It consistes of these steps: 
+    <ol>
      <li data-md>
       <p>Let <var>current</var> be <var>node</var>.</p>
      <li data-md>
       <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-iterate" id="ref-for-list-iterate①">For each</a> <var>child</var> in <var>current</var>’s <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#concept-tree-child" id="ref-for-concept-tree-child">children</a>:</p>
       <ol>
        <li data-md>
-        <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#assert" id="ref-for-assert①">Assert</a>: <var>child</var> <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#implements" id="ref-for-implements">implements</a> <code class="idl"><a data-link-type="idl" href="https://dom.spec.whatwg.org/#text" id="ref-for-text">Text</a></code>, <code class="idl"><a data-link-type="idl" href="https://dom.spec.whatwg.org/#comment" id="ref-for-comment">Comment</a></code>, or <code class="idl"><a data-link-type="idl" href="https://dom.spec.whatwg.org/#element" id="ref-for-element⑧">Element</a></code>.</p>
+        <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#assert" id="ref-for-assert④">Assert</a>: <var>child</var> <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#implements" id="ref-for-implements">implements</a> <code class="idl"><a data-link-type="idl" href="https://dom.spec.whatwg.org/#text" id="ref-for-text">Text</a></code>, <code class="idl"><a data-link-type="idl" href="https://dom.spec.whatwg.org/#comment" id="ref-for-comment">Comment</a></code>, or <code class="idl"><a data-link-type="idl" href="https://dom.spec.whatwg.org/#element" id="ref-for-element⑧">Element</a></code>.</p>
         <p class="note" role="note"><span class="marker">Note:</span> Currently, this algorithm is only called on output of the HTML
        parser for which this assertion should hold. If in the future
        this algorithm will be used in different contexts, this assumption
@@ -1116,7 +1168,7 @@ <h3 class="heading settled" data-level="3.1" id="sanitization"><span class="secn
         <p>else if <var>child</var> <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#implements" id="ref-for-implements②">implements</a> <code class="idl"><a data-link-type="idl" href="https://dom.spec.whatwg.org/#comment" id="ref-for-comment①">Comment</a></code>:</p>
         <ol>
          <li data-md>
-          <p>If <var>config</var>’s <code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-comments" id="ref-for-dom-sanitizerconfig-comments">comments</a></code> is not true:</p>
+          <p>If <var>configuration</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-comments" id="ref-for-dom-sanitizerconfig-comments">comments</a></code>"] is not true:</p>
           <ol>
            <li data-md>
             <p><a data-link-type="dfn" href="https://dom.spec.whatwg.org/#concept-node-remove" id="ref-for-concept-node-remove">remove</a> <var>child</var>.</p>
@@ -1128,22 +1180,16 @@ <h3 class="heading settled" data-level="3.1" id="sanitization"><span class="secn
          <li data-md>
           <p>Let <var>elementName</var> be a <code class="idl"><a data-link-type="idl" href="#dictdef-sanitizerelementnamespace" id="ref-for-dictdef-sanitizerelementnamespace②">SanitizerElementNamespace</a></code> with <var>child</var>’s <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#concept-element-local-name" id="ref-for-concept-element-local-name①">local name</a> and <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#concept-element-namespace" id="ref-for-concept-element-namespace①">namespace</a>.</p>
          <li data-md>
-          <p>If <var>config</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-elements" id="ref-for-dom-sanitizerconfig-elements">elements</a></code>"] exists and <var>config</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-elements" id="ref-for-dom-sanitizerconfig-elements①">elements</a></code>"] does not <a data-link-type="dfn" href="#sanitizerconfig-contains" id="ref-for-sanitizerconfig-contains">contain</a> [<var>elementName</var>]:</p>
+          <p>If <var>configuration</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-removeelements" id="ref-for-dom-sanitizerconfig-removeelements">removeElements</a></code>"] <a data-link-type="dfn" href="#sanitizerconfig-contains" id="ref-for-sanitizerconfig-contains">contains</a> <var>elementName</var>, or if <var>configuration</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-elements" id="ref-for-dom-sanitizerconfig-elements">elements</a></code>"] is not <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-empty" id="ref-for-list-empty">empty</a> and does not <a data-link-type="dfn" href="#sanitizerconfig-contains" id="ref-for-sanitizerconfig-contains①">contain</a> <var>elementName</var>:</p>
           <ol>
            <li data-md>
             <p><a data-link-type="dfn" href="https://dom.spec.whatwg.org/#concept-node-remove" id="ref-for-concept-node-remove①">remove</a> <var>child</var>.</p>
           </ol>
          <li data-md>
-          <p>else if <var>config</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-removeelements" id="ref-for-dom-sanitizerconfig-removeelements">removeElements</a></code>"] exists and <var>config</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-removeelements" id="ref-for-dom-sanitizerconfig-removeelements①">removeElements</a></code>"] <a data-link-type="dfn" href="#sanitizerconfig-contains" id="ref-for-sanitizerconfig-contains①">contains</a> [<var>elementName</var>]:</p>
+          <p>If <var>configuration</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-replacewithchildrenelements" id="ref-for-dom-sanitizerconfig-replacewithchildrenelements">replaceWithChildrenElements</a></code>"] <a data-link-type="dfn" href="#sanitizerconfig-contains" id="ref-for-sanitizerconfig-contains②">contains</a> <var>elementName</var>:</p>
           <ol>
            <li data-md>
-            <p><a data-link-type="dfn" href="https://dom.spec.whatwg.org/#concept-node-remove" id="ref-for-concept-node-remove②">remove</a> <var>child</var>.</p>
-          </ol>
-         <li data-md>
-          <p>If <var>config</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-replacewithchildrenelements" id="ref-for-dom-sanitizerconfig-replacewithchildrenelements">replaceWithChildrenElements</a></code>"] exists and <var>config</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-replacewithchildrenelements" id="ref-for-dom-sanitizerconfig-replacewithchildrenelements①">replaceWithChildrenElements</a></code>"] <a data-link-type="dfn" href="#sanitizerconfig-contains" id="ref-for-sanitizerconfig-contains②">contains</a> <var>elementName</var>:</p>
-          <ol>
-           <li data-md>
-            <p>Call <a data-link-type="dfn" href="#sanitize" id="ref-for-sanitize③">sanitize</a> on <var>child</var> with <var>config</var>.</p>
+            <p>Call <a data-link-type="dfn" href="#sanitize-core" id="ref-for-sanitize-core①">sanitize core</a> on <var>child</var> with <var>configuration</var> and <var>handleJavascriptNavigationUrls</var>.</p>
            <li data-md>
             <p>Call <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#concept-node-replace-all" id="ref-for-concept-node-replace-all①">replace all</a> with <var>child</var>’s <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#concept-tree-child" id="ref-for-concept-tree-child①">children</a> within <var>child</var>.</p>
           </ol>
@@ -1152,513 +1198,346 @@ <h3 class="heading settled" data-level="3.1" id="sanitization"><span class="secn
  "<code>namespace</code>" → <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#html-namespace" id="ref-for-html-namespace①">HTML namespace</a> ]»</p>
           <ol>
            <li data-md>
-            <p>Then call <a data-link-type="dfn" href="#sanitize" id="ref-for-sanitize④">sanitize</a> on <var>child</var>’s <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/scripting.html#template-contents" id="ref-for-template-contents②">template contents</a> with <var>config</var>.</p>
+            <p>Then call <a data-link-type="dfn" href="#sanitize-core" id="ref-for-sanitize-core②">sanitize core</a> on <var>child</var>’s <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/scripting.html#template-contents" id="ref-for-template-contents②">template contents</a> with <var>configuration</var> and <var>handleJavascriptNavigationUrls</var>.</p>
           </ol>
          <li data-md>
           <p>If <var>child</var> is a <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#element-shadow-host" id="ref-for-element-shadow-host①">shadow host</a>:</p>
           <ol>
            <li data-md>
-            <p>Then call <a data-link-type="dfn" href="#sanitize" id="ref-for-sanitize⑤">sanitize</a> on <var>child</var>’s <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#concept-element-shadow-root" id="ref-for-concept-element-shadow-root">shadow root</a> with <var>config</var>.</p>
+            <p>Then call <a data-link-type="dfn" href="#sanitize-core" id="ref-for-sanitize-core③">sanitize core</a> on <var>child</var>’s <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#concept-element-shadow-root" id="ref-for-concept-element-shadow-root">shadow root</a> with <var>configuration</var> and <var>handleJavascriptNavigationUrls</var>.</p>
           </ol>
          <li data-md>
-          <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-iterate" id="ref-for-list-iterate②">For each</a> <var>attr</var> in <var>current</var>’s <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#concept-element-attribute" id="ref-for-concept-element-attribute">attribute list</a>:</p>
+          <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-iterate" id="ref-for-list-iterate②">For each</a> <var>attribute</var> in <var>child</var>’s <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#concept-element-attribute" id="ref-for-concept-element-attribute">attribute list</a>:</p>
           <ol>
            <li data-md>
-            <p>Let <var>attrName</var> be a <code class="idl"><a data-link-type="idl" href="#dictdef-sanitizerattributenamespace" id="ref-for-dictdef-sanitizerattributenamespace①">SanitizerAttributeNamespace</a></code> with <var>attr</var>’s <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#concept-attribute-local-name" id="ref-for-concept-attribute-local-name">local name</a> and <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#concept-attribute-namespace" id="ref-for-concept-attribute-namespace">namespace</a>.</p>
+            <p>Let <var>attrName</var> be a <code class="idl"><a data-link-type="idl" href="#dictdef-sanitizerattributenamespace" id="ref-for-dictdef-sanitizerattributenamespace①">SanitizerAttributeNamespace</a></code> with <var>attribute</var>’s <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#concept-attribute-local-name" id="ref-for-concept-attribute-local-name">local name</a> and <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#concept-attribute-namespace" id="ref-for-concept-attribute-namespace">namespace</a>.</p>
            <li data-md>
-            <p>If <var>config</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-attributes" id="ref-for-dom-sanitizerconfig-attributes">attributes</a></code>"] exists and <var>config</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-attributes" id="ref-for-dom-sanitizerconfig-attributes①">attributes</a></code>"] does not <a data-link-type="dfn" href="#sanitizerconfig-contains" id="ref-for-sanitizerconfig-contains③">contain</a> <var>attrName</var>:</p>
+            <p>If <var>configuration</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-removeattributes" id="ref-for-dom-sanitizerconfig-removeattributes">removeAttributes</a></code>"] <a data-link-type="dfn" href="#sanitizerconfig-contains" id="ref-for-sanitizerconfig-contains③">contains</a> <var>attrName</var>:</p>
             <ol>
              <li data-md>
-              <p>If "data-" is a <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#code-unit-prefix" id="ref-for-code-unit-prefix">code unit prefix</a> of <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#concept-attribute-local-name" id="ref-for-concept-attribute-local-name①">local name</a> and
-  if <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#concept-attribute-namespace" id="ref-for-concept-attribute-namespace①">namespace</a> is <code>null</code> and
-  if <var>config</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-dataattributes" id="ref-for-dom-sanitizerconfig-dataattributes">dataAttributes</a></code>"] exists and is false:</p>
-              <ol>
-               <li data-md>
-                <p>Remove <var>attr</var> from <var>child</var>.</p>
-              </ol>
+              <p>Remove <var>attribute</var> from <var>child</var>.</p>
             </ol>
            <li data-md>
-            <p>else if <var>config</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-removeattributes" id="ref-for-dom-sanitizerconfig-removeattributes">removeAttributes</a></code>"] exists and <var>config</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-removeattributes" id="ref-for-dom-sanitizerconfig-removeattributes①">removeAttributes</a></code>"] <a data-link-type="dfn" href="#sanitizerconfig-contains" id="ref-for-sanitizerconfig-contains④">contains</a> <var>attrName</var>:</p>
+            <p>If <var>configuration</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-elements" id="ref-for-dom-sanitizerconfig-elements①">elements</a></code>"]["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerelementnamespacewithattributes-removeattributes" id="ref-for-dom-sanitizerelementnamespacewithattributes-removeattributes">removeAttributes</a></code>"] <a data-link-type="dfn" href="#sanitizerconfig-contains" id="ref-for-sanitizerconfig-contains④">contains</a> <var>attrName</var>:</p>
             <ol>
              <li data-md>
-              <p>Remove <var>attr</var> from <var>child</var>.</p>
+              <p>Remove <var>attribute</var> from <var>child</var>.</p>
             </ol>
            <li data-md>
-            <p>If <var>config</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-elements" id="ref-for-dom-sanitizerconfig-elements②">elements</a></code>"][<var>elementName</var>] exists,
- and if <var>config</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-elements" id="ref-for-dom-sanitizerconfig-elements③">elements</a></code>"][<var>elementName</var>]["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerelementnamespacewithattributes-attributes" id="ref-for-dom-sanitizerelementnamespacewithattributes-attributes">attributes</a></code>"]
- exists, and if <var>config</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-elements" id="ref-for-dom-sanitizerconfig-elements④">elements</a></code>"][<var>elementName</var>]["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerelementnamespacewithattributes-attributes" id="ref-for-dom-sanitizerelementnamespacewithattributes-attributes①">attributes</a></code>"]
- does not <a data-link-type="dfn" href="#sanitizerconfig-contains" id="ref-for-sanitizerconfig-contains⑤">contain</a> <var>attrName</var>:</p>
-            <ol>
+            <p>If all of the following are false, then remove <var>attribute</var> from <var>child</var>.</p>
+            <ul>
              <li data-md>
-              <p>Remove <var>attr</var> from <var>child</var>.</p>
-            </ol>
-           <li data-md>
-            <p>If <var>config</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-elements" id="ref-for-dom-sanitizerconfig-elements⑤">elements</a></code>"][<var>elementName</var>] exists,
- and if <var>config</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-elements" id="ref-for-dom-sanitizerconfig-elements⑥">elements</a></code>"][<var>elementName</var>]["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerelementnamespacewithattributes-removeattributes" id="ref-for-dom-sanitizerelementnamespacewithattributes-removeattributes">removeAttributes</a></code>"]
- exists, and if <var>config</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-elements" id="ref-for-dom-sanitizerconfig-elements⑦">elements</a></code>"][<var>elementName</var>]["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerelementnamespacewithattributes-removeattributes" id="ref-for-dom-sanitizerelementnamespacewithattributes-removeattributes①">removeAttributes</a></code>"] <a data-link-type="dfn" href="#sanitizerconfig-contains" id="ref-for-sanitizerconfig-contains⑥">contains</a> <var>attrName</var>:</p>
-            <ol>
+              <p><var>configuration</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-attributes" id="ref-for-dom-sanitizerconfig-attributes">attributes</a></code>"] <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-contain" id="ref-for-list-contain">exists</a> and <a data-link-type="dfn" href="#sanitizerconfig-contains" id="ref-for-sanitizerconfig-contains⑤">contains</a> <var>attrName</var></p>
              <li data-md>
-              <p>Remove <var>attr</var> from <var>child</var>.</p>
-            </ol>
+              <p><var>configuration</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-elements" id="ref-for-dom-sanitizerconfig-elements②">elements</a></code>"]["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerelementnamespacewithattributes-attributes" id="ref-for-dom-sanitizerelementnamespacewithattributes-attributes">attributes</a></code>"] <a data-link-type="dfn" href="#sanitizerconfig-contains" id="ref-for-sanitizerconfig-contains⑥">contains</a> <var>attrName</var></p>
+             <li data-md>
+              <p>"data-" is a <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#code-unit-prefix" id="ref-for-code-unit-prefix">code unit prefix</a> of <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#concept-attribute-local-name" id="ref-for-concept-attribute-local-name①">local name</a> and <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#concept-attribute-namespace" id="ref-for-concept-attribute-namespace①">namespace</a> is <code>null</code> and <var>configuration</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-dataattributes" id="ref-for-dom-sanitizerconfig-dataattributes">dataAttributes</a></code>"] is true</p>
+            </ul>
            <li data-md>
-            <p>If «[<var>elementName</var>, <var>attrName</var>]» matches an entry in the <a data-link-type="dfn" href="#navigating-url-attributes-list" id="ref-for-navigating-url-attributes-list">navigating URL attributes list</a>, and if <var>attr</var>’s <a data-link-type="dfn" href="https://urlpattern.spec.whatwg.org/#constructor-string-parser-state-protocol" id="ref-for-constructor-string-parser-state-protocol">protocol</a> is
+            <p>If <var>handleJavascriptNavigationUrls</var> and «[<var>elementName</var>, <var>attrName</var>]» matches an entry in the <a data-link-type="dfn" href="#navigating-url-attributes-list" id="ref-for-navigating-url-attributes-list">navigating URL attributes list</a>, and if <var>attribute</var>’s <a data-link-type="dfn" href="https://urlpattern.spec.whatwg.org/#constructor-string-parser-state-protocol" id="ref-for-constructor-string-parser-state-protocol">protocol</a> is
  "<code>javascript:</code>":</p>
             <ol>
              <li data-md>
-              <p>Then remove <var>attr</var> from <var>child</var>.</p>
+              <p>Then remove <var>attribute</var> from <var>child</var>.</p>
             </ol>
-           <li data-md>
-            <p>Call <a data-link-type="dfn" href="#sanitize" id="ref-for-sanitize⑥">sanitize</a> on <var>child</var>’s <a data-link-type="dfn" href="https://dom.spec.whatwg.org/#concept-element-shadow-root" id="ref-for-concept-element-shadow-root①">shadow root</a> with <var>config</var>.</p>
-          </ol>
-         <li data-md>
-          <p>else:</p>
-          <ol>
-           <li data-md>
-            <p><a data-link-type="dfn" href="https://dom.spec.whatwg.org/#concept-node-remove" id="ref-for-concept-node-remove③">remove</a> <var>child</var>.</p>
           </ol>
         </ol>
       </ol>
     </ol>
    </div>
    <h3 class="heading settled" data-level="3.2" id="configuration-processing"><span class="secno">3.2. </span><span class="content">Configuration Processing</span><a class="self-link" href="#configuration-processing"></a></h3>
-   <div class="algorithm" data-algorithm="valid" data-algorithm-for="SanitizerConfig">
-     A <var>config</var> is <dfn class="dfn-paneled" data-dfn-for="SanitizerConfig" data-dfn-type="dfn" data-noexport id="sanitizerconfig-valid">valid</dfn> if all these conditions are met: 
+   <div class="algorithm" data-algorithm="allow an element" data-algorithm-for="SanitizerConfig">
+     To <dfn class="dfn-paneled" data-dfn-for="SanitizerConfig" data-dfn-type="dfn" data-noexport id="sanitizerconfig-allow-an-element">allow an element</dfn> <var>element</var> with a <code class="idl"><a data-link-type="idl" href="#dictdef-sanitizerconfig" id="ref-for-dictdef-sanitizerconfig⑤">SanitizerConfig</a></code> <var>configuration</var>, do: 
     <ol>
      <li data-md>
-      <p><var>config</var> is a <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#dfn-dictionary" id="ref-for-dfn-dictionary③">dictionary</a></p>
+      <p>Set <var>element</var> to the result of <a data-link-type="dfn" href="#canonicalize-a-sanitizer-element-with-attributes" id="ref-for-canonicalize-a-sanitizer-element-with-attributes">canonicalize a sanitizer element with attributes</a> with <var>element</var>.</p>
      <li data-md>
-      <p><var>config</var>’s <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#map-getting-the-keys" id="ref-for-map-getting-the-keys">key set</a> does not <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-contain" id="ref-for-list-contain">contain</a> both
- "<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-elements" id="ref-for-dom-sanitizerconfig-elements⑧">elements</a></code>" and "<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-removeelements" id="ref-for-dom-sanitizerconfig-removeelements②">removeElements</a></code>"</p>
+      <p><a data-link-type="dfn" href="#sanitizerconfig-remove" id="ref-for-sanitizerconfig-remove">Remove</a> <var>element</var> from <var>configuration</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-elements" id="ref-for-dom-sanitizerconfig-elements③">elements</a></code>"].</p>
      <li data-md>
-      <p><var>config</var>’s <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#map-getting-the-keys" id="ref-for-map-getting-the-keys①">key set</a> does not <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-contain" id="ref-for-list-contain①">contain</a> both
- "<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-removeattributes" id="ref-for-dom-sanitizerconfig-removeattributes②">removeAttributes</a></code>" and "<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-attributes" id="ref-for-dom-sanitizerconfig-attributes②">attributes</a></code>".</p>
+      <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-append" id="ref-for-list-append①">Append</a> <var>element</var> to <var>configuration</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-elements" id="ref-for-dom-sanitizerconfig-elements④">elements</a></code>"].</p>
      <li data-md>
-      <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-iterate" id="ref-for-list-iterate③">For any</a> <var>key</var> of «[
- "<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-elements" id="ref-for-dom-sanitizerconfig-elements⑨">elements</a></code>",
- "<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-removeelements" id="ref-for-dom-sanitizerconfig-removeelements③">removeElements</a></code>",
- "<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-replacewithchildrenelements" id="ref-for-dom-sanitizerconfig-replacewithchildrenelements②">replaceWithChildrenElements</a></code>",
- "<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-attributes" id="ref-for-dom-sanitizerconfig-attributes③">attributes</a></code>",
- "<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-removeattributes" id="ref-for-dom-sanitizerconfig-removeattributes③">removeAttributes</a></code>"
-  ]» where <var>config</var>[<var>key</var>] <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#map-exists" id="ref-for-map-exists①">exists</a>:</p>
-      <ol>
-       <li data-md>
-        <p><var>config</var>[<var>key</var>] is <a data-link-type="dfn" href="#sanitizernamelist-valid" id="ref-for-sanitizernamelist-valid">valid</a>.</p>
-      </ol>
+      <p><a data-link-type="dfn" href="#sanitizerconfig-remove" id="ref-for-sanitizerconfig-remove①">Remove</a> <var>element</var> from <var>configuration</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-removeelements" id="ref-for-dom-sanitizerconfig-removeelements①">removeElements</a></code>"].</p>
      <li data-md>
-      <p>If <var>config</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-elements" id="ref-for-dom-sanitizerconfig-elements①⓪">elements</a></code>"] exists, then <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-iterate" id="ref-for-list-iterate④">for any</a> <var>element</var> in <var>config</var>[<var>key</var>] that is a <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#dfn-dictionary" id="ref-for-dfn-dictionary④">dictionary</a>:</p>
-      <ol>
-       <li data-md>
-        <p><var>element</var> does not <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-contain" id="ref-for-list-contain②">contain</a> both
-  "<code class="idl"><a data-link-type="idl" href="#dom-sanitizerelementnamespacewithattributes-attributes" id="ref-for-dom-sanitizerelementnamespacewithattributes-attributes②">attributes</a></code>" and
-  "<code class="idl"><a data-link-type="idl" href="#dom-sanitizerelementnamespacewithattributes-removeattributes" id="ref-for-dom-sanitizerelementnamespacewithattributes-removeattributes②">removeAttributes</a></code>".</p>
-       <li data-md>
-        <p>If either <var>element</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerelementnamespacewithattributes-attributes" id="ref-for-dom-sanitizerelementnamespacewithattributes-attributes③">attributes</a></code>"]
-  or <var>element</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerelementnamespacewithattributes-removeattributes" id="ref-for-dom-sanitizerelementnamespacewithattributes-removeattributes③">removeAttributes</a></code>"] <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#map-exists" id="ref-for-map-exists②">exists</a>, then it is <a data-link-type="dfn" href="#sanitizernamelist-valid" id="ref-for-sanitizernamelist-valid①">valid</a>.</p>
-       <li data-md>
-        <p>Let <var>tmp</var> be a <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#dfn-dictionary" id="ref-for-dfn-dictionary⑤">dictionary</a>, and for any <var>key</var> «[
-  "<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-elements" id="ref-for-dom-sanitizerconfig-elements①①">elements</a></code>",
-  "<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-removeelements" id="ref-for-dom-sanitizerconfig-removeelements④">removeElements</a></code>",
-  "<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-replacewithchildrenelements" id="ref-for-dom-sanitizerconfig-replacewithchildrenelements③">replaceWithChildrenElements</a></code>",
-  "<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-attributes" id="ref-for-dom-sanitizerconfig-attributes④">attributes</a></code>",
-  "<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-removeattributes" id="ref-for-dom-sanitizerconfig-removeattributes④">removeAttributes</a></code>"
-  ]» <var>tmp</var>[<var>key</var>] is set to the result of <a data-link-type="dfn" href="#canonicalize-a-sanitizer-element-list" id="ref-for-canonicalize-a-sanitizer-element-list">canonicalize a sanitizer
-  element list</a> called on <var>config</var>[<var>key</var>], and <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#html-namespace" id="ref-for-html-namespace②">HTML namespace</a> as default
-  namespace for the element lists, and <code>null</code> as default namespace for the
-  attributes lists.</p>
-        <p class="note" role="note"><span class="marker">Note:</span> The intent here is to assert about list elements, but without regard
-        to whether the string shortcut syntax or the explicit dictionary
-        syntax is used. For example, having "img" in <code>elements</code> and <code>{ name: "img" }</code> in <code>removeElements</code>. An implementation might well
-        do this without explicitly canonicalizing the lists at this point.</p>
-        <ol>
-         <li data-md>
-          <p>Given theses canonicalized name lists, all of the following conditions hold:</p>
-          <ol>
-           <li data-md>
-            <p>The <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#set-intersection" id="ref-for-set-intersection">intersection</a> between <var>tmp</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-elements" id="ref-for-dom-sanitizerconfig-elements①②">elements</a></code>"] and <var>tmp</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-removeelements" id="ref-for-dom-sanitizerconfig-removeelements⑤">removeElements</a></code>"]
- is <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-empty" id="ref-for-list-empty②">empty</a>.</p>
-           <li data-md>
-            <p>The <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#set-intersection" id="ref-for-set-intersection①">intersection</a> between <var>tmp</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-removeelements" id="ref-for-dom-sanitizerconfig-removeelements⑥">removeElements</a></code>"] <var>tmp</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-replacewithchildrenelements" id="ref-for-dom-sanitizerconfig-replacewithchildrenelements④">replaceWithChildrenElements</a></code>"]
- is <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-empty" id="ref-for-list-empty③">empty</a>.</p>
-           <li data-md>
-            <p>The <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#set-intersection" id="ref-for-set-intersection②">intersection</a> between <var>tmp</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-replacewithchildrenelements" id="ref-for-dom-sanitizerconfig-replacewithchildrenelements⑤">replaceWithChildrenElements</a></code>"] and <var>tmp</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-elements" id="ref-for-dom-sanitizerconfig-elements①③">elements</a></code>"]
- is <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-empty" id="ref-for-list-empty④">empty</a>.</p>
-           <li data-md>
-            <p>The <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#set-intersection" id="ref-for-set-intersection③">intersection</a> between <var>tmp</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-attributes" id="ref-for-dom-sanitizerconfig-attributes⑤">attributes</a></code>"] and <var>tmp</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-removeattributes" id="ref-for-dom-sanitizerconfig-removeattributes⑤">removeAttributes</a></code>"]
- is <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-empty" id="ref-for-list-empty⑤">empty</a>.</p>
-          </ol>
-        </ol>
-        <ol>
-         <li data-md>
-          <p>Let <var>tmpattrs</var> be <var>tmp</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-attributes" id="ref-for-dom-sanitizerconfig-attributes⑥">attributes</a></code>"] if it exists,
- and otherwise <a data-link-type="dfn" href="#built-in-default-config" id="ref-for-built-in-default-config">built-in default config</a>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-attributes" id="ref-for-dom-sanitizerconfig-attributes⑦">attributes</a></code>"].</p>
-         <li data-md>
-          <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-iterate" id="ref-for-list-iterate⑤">For any</a> <var>item</var> in <var>tmp</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-elements" id="ref-for-dom-sanitizerconfig-elements①④">elements</a></code>"]:</p>
-          <ol>
-           <li data-md>
-            <p>If either <var>item</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerelementnamespacewithattributes-attributes" id="ref-for-dom-sanitizerelementnamespacewithattributes-attributes④">attributes</a></code>"]
-  or <var>item</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerelementnamespacewithattributes-removeattributes" id="ref-for-dom-sanitizerelementnamespacewithattributes-removeattributes④">removeAttributes</a></code>"]
-  exists:</p>
-            <ol>
-             <li data-md>
-              <p>Then the <a data-link-type="dfn" href="#set-difference" id="ref-for-set-difference">difference</a> between it and <var>tmpattrs</var> is <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-empty" id="ref-for-list-empty⑥">empty</a>.</p>
-            </ol>
-          </ol>
-        </ol>
-      </ol>
+      <p><a data-link-type="dfn" href="#sanitizerconfig-remove" id="ref-for-sanitizerconfig-remove②">Remove</a> <var>element</var> from <var>configuration</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-replacewithchildrenelements" id="ref-for-dom-sanitizerconfig-replacewithchildrenelements①">replaceWithChildrenElements</a></code>"].</p>
     </ol>
+    <p class="note" role="note"><span class="marker">NOTE:</span> Handling of <a data-link-type="dfn" href="#sanitizer-allowelement" id="ref-for-sanitizer-allowelement">allowElement</a> is a little more complicated than the other
+    methods, because the element allow list can have per-element allow- and
+    remove-attribute lists. We first remove the given element from the list
+    before then adding it, which has the effect of re-setting (rather than
+    merging or elsehow modifying) the per-element list to whatever is passed
+    in. In other words, the per-element allow- and remove-lists can only be
+    set as a whole.</p>
+    <p class="note" role="note"><span class="marker">NOTE:</span> <a data-link-type="dfn" href="#sanitizerconfig-remove" id="ref-for-sanitizerconfig-remove③">Remove</a> matches on name and namespace, so adding an
+    element with attributes would still remove the matching element from the <code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-removeelements" id="ref-for-dom-sanitizerconfig-removeelements②">removeElements</a></code> and <code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-replacewithchildrenelements" id="ref-for-dom-sanitizerconfig-replacewithchildrenelements②">replaceWithChildrenElements</a></code> lists.</p>
    </div>
-   <div class="algorithm" data-algorithm="valid" data-algorithm-for="SanitizerNameList">
-     A <var>list</var> of names is <dfn class="dfn-paneled" data-dfn-for="SanitizerNameList" data-dfn-type="dfn" data-noexport id="sanitizernamelist-valid">valid</dfn> if all these
-conditions are met: 
+   <div class="algorithm" data-algorithm="remove an element" data-algorithm-for="Sanitizer">
+     To <dfn class="dfn-paneled" data-dfn-for="Sanitizer" data-dfn-type="dfn" data-noexport id="sanitizer-remove-an-element">remove an element</dfn> <var>element</var> from a <code class="idl"><a data-link-type="idl" href="#dictdef-sanitizerconfig" id="ref-for-dictdef-sanitizerconfig⑥">SanitizerConfig</a></code> <var>configuration</var>, do: 
     <ol>
      <li data-md>
-      <p><var>list</var> is a <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list" id="ref-for-list">list</a>.</p>
+      <p>Set <var>element</var> to the result of <a data-link-type="dfn" href="#canonicalize-a-sanitizer-element" id="ref-for-canonicalize-a-sanitizer-element">canonicalize a sanitizer element</a> with <var>element</var>.</p>
      <li data-md>
-      <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-iterate" id="ref-for-list-iterate⑥">For all</a> of its members <var>name</var>:</p>
-      <ol>
-       <li data-md>
-        <p><var>name</var> is a <code class="idl"><a data-link-type="idl" href="https://wicg.github.io/speech-api/#dom-speechgrammarlist-addfromstring-string-weight-string" id="ref-for-dom-speechgrammarlist-addfromstring-string-weight-string">string</a></code> or a <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#dfn-dictionary" id="ref-for-dfn-dictionary⑥">dictionary</a>.</p>
-       <li data-md>
-        <p>If <var>name</var> is a <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#dfn-dictionary" id="ref-for-dfn-dictionary⑦">dictionary</a>:</p>
-        <ol>
-         <li data-md>
-          <p><var>name</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerelementnamespace-name" id="ref-for-dom-sanitizerelementnamespace-name">name</a></code>"] <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#map-exists" id="ref-for-map-exists③">exists</a> and is a <code class="idl"><a data-link-type="idl" href="https://wicg.github.io/speech-api/#dom-speechgrammarlist-addfromstring-string-weight-string" id="ref-for-dom-speechgrammarlist-addfromstring-string-weight-string①">string</a></code>.</p>
-        </ol>
-      </ol>
+      <p><a data-link-type="dfn" href="#sanitizerconfig-add" id="ref-for-sanitizerconfig-add">Add</a> <var>element</var> to <var>configuration</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-removeelements" id="ref-for-dom-sanitizerconfig-removeelements③">removeElements</a></code>"].</p>
+     <li data-md>
+      <p><a data-link-type="dfn" href="#sanitizerconfig-remove" id="ref-for-sanitizerconfig-remove④">Remove</a> <var>element</var> from <var>configuration</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-elements" id="ref-for-dom-sanitizerconfig-elements⑤">elements</a></code>"] list.</p>
+     <li data-md>
+      <p><a data-link-type="dfn" href="#sanitizerconfig-remove" id="ref-for-sanitizerconfig-remove⑤">Remove</a> <var>element</var> from <var>configuration</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-replacewithchildrenelements" id="ref-for-dom-sanitizerconfig-replacewithchildrenelements③">replaceWithChildrenElements</a></code>"].</p>
     </ol>
    </div>
-   <div class="algorithm" data-algorithm="canonical" data-algorithm-for="SanitizerConfig">
-     A <var>config</var> is <dfn class="dfn-paneled" data-dfn-for="SanitizerConfig" data-dfn-type="dfn" data-noexport id="sanitizerconfig-canonical">canonical</dfn> if all these conditions are met: 
+   <div class="algorithm" data-algorithm="replace an element with its children" data-algorithm-for="Sanitizer">
+     To <dfn class="dfn-paneled" data-dfn-for="Sanitizer" data-dfn-type="dfn" data-noexport id="sanitizer-replace-an-element-with-its-children">replace an element with its children</dfn> <var>element</var> from a <code class="idl"><a data-link-type="idl" href="#dictdef-sanitizerconfig" id="ref-for-dictdef-sanitizerconfig⑦">SanitizerConfig</a></code> <var>configuration</var>, do: 
     <ol>
      <li data-md>
-      <p><var>config</var> is <a data-link-type="dfn" href="#sanitizerconfig-valid" id="ref-for-sanitizerconfig-valid">valid</a>.</p>
+      <p>Set <var>element</var> to the result of <a data-link-type="dfn" href="#canonicalize-a-sanitizer-element" id="ref-for-canonicalize-a-sanitizer-element①">canonicalize a sanitizer element</a> with <var>element</var>.</p>
      <li data-md>
-      <p><var>config</var>’s <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#map-getting-the-keys" id="ref-for-map-getting-the-keys②">key set</a> is a <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#set-subset" id="ref-for-set-subset">subset</a> of
- «[
- "<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-elements" id="ref-for-dom-sanitizerconfig-elements①⑤">elements</a></code>",
- "<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-removeelements" id="ref-for-dom-sanitizerconfig-removeelements⑦">removeElements</a></code>",
- "<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-replacewithchildrenelements" id="ref-for-dom-sanitizerconfig-replacewithchildrenelements⑥">replaceWithChildrenElements</a></code>",
- "<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-attributes" id="ref-for-dom-sanitizerconfig-attributes⑧">attributes</a></code>",
- "<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-removeattributes" id="ref-for-dom-sanitizerconfig-removeattributes⑥">removeAttributes</a></code>",
- "<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-comments" id="ref-for-dom-sanitizerconfig-comments①">comments</a></code>",
- "<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-dataattributes" id="ref-for-dom-sanitizerconfig-dataattributes①">dataAttributes</a></code>"
- ]»</p>
+      <p><a data-link-type="dfn" href="#sanitizerconfig-add" id="ref-for-sanitizerconfig-add①">Add</a> <var>element</var> to <var>configuration</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-replacewithchildrenelements" id="ref-for-dom-sanitizerconfig-replacewithchildrenelements④">replaceWithChildrenElements</a></code>"].</p>
      <li data-md>
-      <p><var>config</var>’s <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#map-getting-the-keys" id="ref-for-map-getting-the-keys③">key set</a> <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-contain" id="ref-for-list-contain③">contains</a> either:</p>
-      <ol>
-       <li data-md>
-        <p>both "<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-elements" id="ref-for-dom-sanitizerconfig-elements①⑥">elements</a></code>" and "<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-attributes" id="ref-for-dom-sanitizerconfig-attributes⑨">attributes</a></code>",
-  but neither of
-  "<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-removeelements" id="ref-for-dom-sanitizerconfig-removeelements⑧">removeElements</a></code>" or "<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-removeattributes" id="ref-for-dom-sanitizerconfig-removeattributes⑦">removeAttributes</a></code>".</p>
-       <li data-md>
-        <p>or both
-  "<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-removeelements" id="ref-for-dom-sanitizerconfig-removeelements⑨">removeElements</a></code>" and "<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-removeattributes" id="ref-for-dom-sanitizerconfig-removeattributes⑧">removeAttributes</a></code>",
-  but neither of
-  "<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-elements" id="ref-for-dom-sanitizerconfig-elements①⑦">elements</a></code>" or "<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-attributes" id="ref-for-dom-sanitizerconfig-attributes①⓪">attributes</a></code>".</p>
-      </ol>
+      <p><a data-link-type="dfn" href="#sanitizerconfig-remove" id="ref-for-sanitizerconfig-remove⑥">Remove</a> <var>element</var> from <var>configuration</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-removeelements" id="ref-for-dom-sanitizerconfig-removeelements④">removeElements</a></code>"].</p>
      <li data-md>
-      <p>For any <var>key</var> of «[
-    "<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-replacewithchildrenelements" id="ref-for-dom-sanitizerconfig-replacewithchildrenelements⑦">replaceWithChildrenElements</a></code>",
-    "<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-removeelements" id="ref-for-dom-sanitizerconfig-removeelements①⓪">removeElements</a></code>",
-    "<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-attributes" id="ref-for-dom-sanitizerconfig-attributes①①">attributes</a></code>",
-    "<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-removeattributes" id="ref-for-dom-sanitizerconfig-removeattributes⑨">removeAttributes</a></code>"
-    ]» where <var>config</var>[<var>key</var>] <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#map-exists" id="ref-for-map-exists④">exists</a>:</p>
-      <ol>
-       <li data-md>
-        <p><var>config</var>[<var>key</var>] is <a data-link-type="dfn" href="#sanitizernamelist-canonical" id="ref-for-sanitizernamelist-canonical">canonical</a>.</p>
-      </ol>
+      <p><a data-link-type="dfn" href="#sanitizerconfig-remove" id="ref-for-sanitizerconfig-remove⑦">Remove</a> <var>element</var> from <var>configuration</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-elements" id="ref-for-dom-sanitizerconfig-elements⑥">elements</a></code>"] list.</p>
+    </ol>
+   </div>
+   <div class="algorithm" data-algorithm="allow an attribute" data-algorithm-for="Sanitizer">
+     To <dfn class="dfn-paneled" data-dfn-for="Sanitizer" data-dfn-type="dfn" data-noexport id="sanitizer-allow-an-attribute">allow an attribute</dfn> <var>attribute</var> on a <code class="idl"><a data-link-type="idl" href="#dictdef-sanitizerconfig" id="ref-for-dictdef-sanitizerconfig⑧">SanitizerConfig</a></code> <var>configuration</var>, do: 
+    <ol>
      <li data-md>
-      <p>If <var>config</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-elements" id="ref-for-dom-sanitizerconfig-elements①⑧">elements</a></code>"] <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#map-exists" id="ref-for-map-exists⑤">exists</a>:</p>
-      <ol>
-       <li data-md>
-        <p><var>config</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-elements" id="ref-for-dom-sanitizerconfig-elements①⑨">elements</a></code>"] is <a data-link-type="dfn" href="#sanitizernamewithattributeslist-canonical" id="ref-for-sanitizernamewithattributeslist-canonical">canonical</a>.</p>
-      </ol>
+      <p>Set <var>attribute</var> to the result of <a data-link-type="dfn" href="#canonicalize-a-sanitizer-attribute" id="ref-for-canonicalize-a-sanitizer-attribute">canonicalize a sanitizer attribute</a> with <var>attribute</var>.</p>
      <li data-md>
-      <p>For any <var>key</var> of «[
- "<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-comments" id="ref-for-dom-sanitizerconfig-comments②">comments</a></code>",
- "<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-dataattributes" id="ref-for-dom-sanitizerconfig-dataattributes②">dataAttributes</a></code>"
- ]»:</p>
-      <ol>
-       <li data-md>
-        <p>if <var>config</var>[<var>key</var>] <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#map-exists" id="ref-for-map-exists⑥">exists</a>, <var>config</var>[<var>key</var>] is a <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-boolean" id="ref-for-idl-boolean②">boolean</a></code>.</p>
-      </ol>
+      <p><a data-link-type="dfn" href="#sanitizerconfig-add" id="ref-for-sanitizerconfig-add②">Add</a> <var>attribute</var> to <var>configuration</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-attributes" id="ref-for-dom-sanitizerconfig-attributes①">attributes</a></code>"].</p>
+     <li data-md>
+      <p><a data-link-type="dfn" href="#sanitizerconfig-remove" id="ref-for-sanitizerconfig-remove⑧">Remove</a> <var>attribute</var> from <var>configuration</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-removeattributes" id="ref-for-dom-sanitizerconfig-removeattributes①">removeAttributes</a></code>"].</p>
     </ol>
    </div>
-   <div class="algorithm" data-algorithm="canonical" data-algorithm-for="SanitizerNameList">
-     A <var>list</var> of names is <dfn class="dfn-paneled" data-dfn-for="SanitizerNameList" data-dfn-type="dfn" data-noexport id="sanitizernamelist-canonical">canonical</dfn> if all these
-conditions are met: 
+   <div class="algorithm" data-algorithm="remove an attribute" data-algorithm-for="Sanitizer">
+     To <dfn class="dfn-paneled" data-dfn-for="Sanitizer" data-dfn-type="dfn" data-noexport id="sanitizer-remove-an-attribute">remove an attribute</dfn> <var>attribute</var> from a <code class="idl"><a data-link-type="idl" href="#dictdef-sanitizerconfig" id="ref-for-dictdef-sanitizerconfig⑨">SanitizerConfig</a></code> <var>configuration</var>, do: 
     <ol>
      <li data-md>
-      <p><var>list</var>[<var>key</var>] is a <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list" id="ref-for-list①">list</a>.</p>
+      <p>Set <var>attribute</var> to the result of <a data-link-type="dfn" href="#canonicalize-a-sanitizer-attribute" id="ref-for-canonicalize-a-sanitizer-attribute①">canonicalize a sanitizer attribute</a> with <var>attribute</var>.</p>
      <li data-md>
-      <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-iterate" id="ref-for-list-iterate⑦">For all</a> of its <var>list</var>[<var>key</var>]'s members <var>name</var>:</p>
-      <ol>
-       <li data-md>
-        <p><var>name</var> is a <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#dfn-dictionary" id="ref-for-dfn-dictionary⑧">dictionary</a>.</p>
-       <li data-md>
-        <p><var>name</var>’s <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#map-getting-the-keys" id="ref-for-map-getting-the-keys④">key set</a> <a data-link-type="dfn" href="#set-equal" id="ref-for-set-equal①">equals</a> «[
-"<code class="idl"><a data-link-type="idl" href="#dom-sanitizerelementnamespace-name" id="ref-for-dom-sanitizerelementnamespace-name①">name</a></code>", "<code class="idl"><a data-link-type="idl" href="#dom-sanitizerelementnamespace-namespace" id="ref-for-dom-sanitizerelementnamespace-namespace">namespace</a></code>"
- ]»</p>
-       <li data-md>
-        <p><var>name</var>’s <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#map-getting-the-values" id="ref-for-map-getting-the-values">values</a> are <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#string" id="ref-for-string①">string</a>s.</p>
-      </ol>
+      <p><a data-link-type="dfn" href="#sanitizerconfig-add" id="ref-for-sanitizerconfig-add③">Add</a> <var>attribute</var> to <var>configuration</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-removeattributes" id="ref-for-dom-sanitizerconfig-removeattributes②">removeAttributes</a></code>"].</p>
+     <li data-md>
+      <p><a data-link-type="dfn" href="#sanitizerconfig-remove" id="ref-for-sanitizerconfig-remove⑨">Remove</a> <var>attribute</var> from <var>configuration</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-attributes" id="ref-for-dom-sanitizerconfig-attributes②">attributes</a></code>"].</p>
     </ol>
    </div>
-   <div class="algorithm" data-algorithm="canonical" data-algorithm-for="SanitizerNameWithAttributesList">
-     A <var>list</var> of names is <dfn class="dfn-paneled" data-dfn-for="SanitizerNameWithAttributesList" data-dfn-type="dfn" data-noexport id="sanitizernamewithattributeslist-canonical">canonical</dfn> if all these conditions are met: 
+   <div class="algorithm" data-algorithm="set comments" data-algorithm-for="Sanitizer">
+     To <dfn class="dfn-paneled" data-dfn-for="Sanitizer" data-dfn-type="dfn" data-noexport id="sanitizer-set-comments">set comments</dfn> with <var>allow</var> on a <code class="idl"><a data-link-type="idl" href="#dictdef-sanitizerconfig" id="ref-for-dictdef-sanitizerconfig①⓪">SanitizerConfig</a></code> <var>configuration</var>, do: 
     <ol>
      <li data-md>
-      <p><var>list</var>[<var>key</var>] is a <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list" id="ref-for-list②">list</a>.</p>
+      <p>Set <var>configuration</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-comments" id="ref-for-dom-sanitizerconfig-comments①">comments</a></code>"] to <var>allow</var>.</p>
+    </ol>
+   </div>
+   <div class="algorithm" data-algorithm="set data attributes" data-algorithm-for="Sanitizer">
+     To <dfn class="dfn-paneled" data-dfn-for="Sanitizer" data-dfn-type="dfn" data-noexport id="sanitizer-set-data-attributes">set data attributes</dfn> with <var>allow</var> on a <code class="idl"><a data-link-type="idl" href="#dictdef-sanitizerconfig" id="ref-for-dictdef-sanitizerconfig①①">SanitizerConfig</a></code> <var>configuration</var>, do: 
+    <ol>
      <li data-md>
-      <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-iterate" id="ref-for-list-iterate⑧">For all</a> of its <var>list</var>[<var>key</var>]'s members <var>name</var>:</p>
-      <ol>
-       <li data-md>
-        <p><var>name</var> is a <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#dfn-dictionary" id="ref-for-dfn-dictionary⑨">dictionary</a>.</p>
-       <li data-md>
-        <p><var>name</var>’s <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#map-getting-the-keys" id="ref-for-map-getting-the-keys⑤">key set</a> <a data-link-type="dfn" href="#set-equal" id="ref-for-set-equal②">equals</a> one of:</p>
-        <ol>
-         <li data-md>
-          <p>«[
- "<code class="idl"><a data-link-type="idl" href="#dom-sanitizerelementnamespace-name" id="ref-for-dom-sanitizerelementnamespace-name②">name</a></code>",
- "<code class="idl"><a data-link-type="idl" href="#dom-sanitizerelementnamespace-namespace" id="ref-for-dom-sanitizerelementnamespace-namespace①">namespace</a></code>"
- ]»</p>
-         <li data-md>
-          <p>«[
- "<code class="idl"><a data-link-type="idl" href="#dom-sanitizerelementnamespace-name" id="ref-for-dom-sanitizerelementnamespace-name③">name</a></code>",
- "<code class="idl"><a data-link-type="idl" href="#dom-sanitizerelementnamespace-namespace" id="ref-for-dom-sanitizerelementnamespace-namespace②">namespace</a></code>",
- "<code class="idl"><a data-link-type="idl" href="#dom-sanitizerelementnamespacewithattributes-attributes" id="ref-for-dom-sanitizerelementnamespacewithattributes-attributes⑤">attributes</a></code>"
- ]»</p>
-         <li data-md>
-          <p>«[
- "<code class="idl"><a data-link-type="idl" href="#dom-sanitizerelementnamespace-name" id="ref-for-dom-sanitizerelementnamespace-name④">name</a></code>",
- "<code class="idl"><a data-link-type="idl" href="#dom-sanitizerelementnamespace-namespace" id="ref-for-dom-sanitizerelementnamespace-namespace③">namespace</a></code>",
- "<code class="idl"><a data-link-type="idl" href="#dom-sanitizerelementnamespacewithattributes-removeattributes" id="ref-for-dom-sanitizerelementnamespacewithattributes-removeattributes⑤">removeAttributes</a></code>"
- ]»</p>
-        </ol>
-       <li data-md>
-        <p><var>name</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerelementnamespace-name" id="ref-for-dom-sanitizerelementnamespace-name⑤">name</a></code>"] and <var>name</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerelementnamespace-namespace" id="ref-for-dom-sanitizerelementnamespace-namespace④">namespace</a></code>"] are <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#string" id="ref-for-string②">string</a>s.</p>
-       <li data-md>
-        <p><var>name</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerelementnamespacewithattributes-attributes" id="ref-for-dom-sanitizerelementnamespacewithattributes-attributes⑥">attributes</a></code>"] and <var>name</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerelementnamespacewithattributes-removeattributes" id="ref-for-dom-sanitizerelementnamespacewithattributes-removeattributes⑥">removeAttributes</a></code>"]
-  are <a data-link-type="dfn" href="#sanitizernamelist-canonical" id="ref-for-sanitizernamelist-canonical①">canonical</a> if they <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#map-exists" id="ref-for-map-exists⑦">exist</a>.</p>
-      </ol>
+      <p>Set <var>configuration</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-dataattributes" id="ref-for-dom-sanitizerconfig-dataattributes①">dataAttributes</a></code>"] to <var>allow</var>.</p>
     </ol>
    </div>
-   <div class="algorithm" data-algorithm="canonicalize a configuration">
-     To <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="canonicalize-a-configuration">canonicalize a configuration</dfn> <var>config</var> with a <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#boolean" id="ref-for-boolean①">boolean</a> <var>safe</var>: 
-    <p class="note" role="note"><span class="marker">Note:</span> The initial set of <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#assert" id="ref-for-assert②">assert</a>s assert properties of the built-in
-      constants, like the <a data-link-type="dfn" href="#built-in-default-config" id="ref-for-built-in-default-config①">defaults</a> and
-      the lists of known <a data-link-type="dfn" href="#known-elements" id="ref-for-known-elements">elements</a> and <a data-link-type="dfn" href="#known-attributes" id="ref-for-known-attributes">attributes</a>.</p>
+   <div class="algorithm" data-algorithm="remove unsafe" data-algorithm-for="SanitizerConfig">
+    <p class="note" role="note"><span class="marker">Note:</span> While this algorithm is called <a data-link-type="dfn" href="#sanitizerconfig-remove-unsafe" id="ref-for-sanitizerconfig-remove-unsafe②">remove unsafe</a>, we use <a href="#security-considerations">the term "unsafe" strictly in the sense
+    of this spec</a>, to denote content that will
+    execute JavaScript when inserted into the document. In other words, this
+    method will remove oportunities for XSS.</p>
+    <p>To <dfn class="dfn-paneled" data-dfn-for="SanitizerConfig" data-dfn-type="dfn" data-noexport id="sanitizerconfig-remove-unsafe">remove unsafe</dfn> from a <var>configuration</var>, do this:</p>
     <ol>
      <li data-md>
-      <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#assert" id="ref-for-assert③">Assert</a>: <a data-link-type="dfn" href="#built-in-default-config" id="ref-for-built-in-default-config②">built-in default config</a> is <a data-link-type="dfn" href="#sanitizerconfig-canonical" id="ref-for-sanitizerconfig-canonical③">canonical</a>.</p>
+      <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#assert" id="ref-for-assert⑤">Assert</a>: The <a data-link-type="dfn" href="#built-in-safe-baseline-configuration" id="ref-for-built-in-safe-baseline-configuration">built-in safe baseline configuration</a> has <code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-removeelements" id="ref-for-dom-sanitizerconfig-removeelements⑤">removeElements</a></code> and <code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-removeattributes" id="ref-for-dom-sanitizerconfig-removeattributes③">removeAttributes</a></code> keys set, but not <code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-elements" id="ref-for-dom-sanitizerconfig-elements⑦">elements</a></code>, <code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-replacewithchildrenelements" id="ref-for-dom-sanitizerconfig-replacewithchildrenelements⑤">replaceWithChildrenElements</a></code>, or <code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-attributes" id="ref-for-dom-sanitizerconfig-attributes③">attributes</a></code>.</p>
      <li data-md>
-      <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#assert" id="ref-for-assert④">Assert</a>: <a data-link-type="dfn" href="#built-in-default-config" id="ref-for-built-in-default-config③">built-in default config</a>["elements"] is a <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#set-subset" id="ref-for-set-subset①">subset</a> of <a data-link-type="dfn" href="#known-elements" id="ref-for-known-elements①">known elements</a>.</p>
+      <p>Let <var>result</var> be a copy of <var>configuration</var>.</p>
      <li data-md>
-      <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#assert" id="ref-for-assert⑤">Assert</a>: <a data-link-type="dfn" href="#built-in-default-config" id="ref-for-built-in-default-config④">built-in default config</a>["attributes"] is a <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#set-subset" id="ref-for-set-subset②">subset</a> of <a data-link-type="dfn" href="#known-attributes" id="ref-for-known-attributes①">known attributes</a>.</p>
+      <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-iterate" id="ref-for-list-iterate③">For each</a> <var>element</var> in <a data-link-type="dfn" href="#built-in-safe-baseline-configuration" id="ref-for-built-in-safe-baseline-configuration①">built-in safe baseline configuration</a>[<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-removeelements" id="ref-for-dom-sanitizerconfig-removeelements⑥">removeElements</a></code>]:</p>
+      <ol>
+       <li data-md>
+        <p>Call <a data-link-type="dfn" href="#sanitizer-remove-an-element" id="ref-for-sanitizer-remove-an-element①">remove an element</a> with <var>element</var> and <var>result</var>.</p>
+      </ol>
      <li data-md>
-      <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#assert" id="ref-for-assert⑥">Assert</a>: «[
- "elements" → <a data-link-type="dfn" href="#known-elements" id="ref-for-known-elements②">known elements</a>,
- "attributes" → <a data-link-type="dfn" href="#known-attributes" id="ref-for-known-attributes②">known attributes</a>,
- ]» is <a data-link-type="dfn" href="#sanitizerconfig-canonical" id="ref-for-sanitizerconfig-canonical④">canonical</a>.</p>
+      <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-iterate" id="ref-for-list-iterate④">For each</a> <var>attribute</var> in <a data-link-type="dfn" href="#built-in-safe-baseline-configuration" id="ref-for-built-in-safe-baseline-configuration②">built-in safe baseline configuration</a>[<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-removeattributes" id="ref-for-dom-sanitizerconfig-removeattributes④">removeAttributes</a></code>]:</p>
+      <ol>
+       <li data-md>
+        <p>Call <a data-link-type="dfn" href="#sanitizer-remove-an-attribute" id="ref-for-sanitizer-remove-an-attribute①">remove an attribute</a> with <var>attribute</var> and <var>result</var>.</p>
+      </ol>
      <li data-md>
-      <p>If <var>config</var> is <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-empty" id="ref-for-list-empty⑦">empty</a> and not <var>safe</var>, then return «[]»</p>
+      <p>Return <var>result</var>.</p>
+    </ol>
+   </div>
+   <div class="algorithm" data-algorithm="set a configuration" data-algorithm-for="Sanitizer">
+     To <dfn class="dfn-paneled" data-dfn-for="Sanitizer" data-dfn-type="dfn" data-noexport id="sanitizer-set-a-configuration">set a configuration</dfn>, given a <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#dfn-dictionary" id="ref-for-dfn-dictionary⑤">dictionary</a> <var>configuration</var> and a <code class="idl"><a data-link-type="idl" href="#sanitizer" id="ref-for-sanitizer⑨">Sanitizer</a></code> <var>sanitizer</var>: 
+    <ol>
      <li data-md>
-      <p>If <var>config</var> is not <a data-link-type="dfn" href="#sanitizerconfig-valid" id="ref-for-sanitizerconfig-valid①">valid</a>, then <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#dfn-throw" id="ref-for-dfn-throw">throw</a> a <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#exceptiondef-typeerror" id="ref-for-exceptiondef-typeerror">TypeError</a></code>.</p>
+      <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-iterate" id="ref-for-list-iterate⑤">For each</a> <var>element</var> of <var>configuration</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-elements" id="ref-for-dom-sanitizerconfig-elements⑧">elements</a></code>"] do:</p>
+      <ol>
+       <li data-md>
+        <p>Call <a data-link-type="dfn" href="#sanitizerconfig-allow-an-element" id="ref-for-sanitizerconfig-allow-an-element①">allow an element</a> with <var>element</var> and <var>sanitizer</var>.</p>
+      </ol>
+     <li data-md>
+      <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-iterate" id="ref-for-list-iterate⑥">For each</a> <var>element</var> of <var>configuration</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-removeelements" id="ref-for-dom-sanitizerconfig-removeelements⑦">removeElements</a></code>"] do:</p>
+      <ol>
+       <li data-md>
+        <p>Call <a data-link-type="dfn" href="#sanitizer-remove-an-element" id="ref-for-sanitizer-remove-an-element②">remove an element</a> with <var>element</var> and <var>sanitizer</var>.</p>
+      </ol>
      <li data-md>
-      <p>Let <var>result</var> be a new <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#dfn-dictionary" id="ref-for-dfn-dictionary①⓪">dictionary</a>.</p>
+      <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-iterate" id="ref-for-list-iterate⑦">For each</a> <var>element</var> of <var>configuration</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-replacewithchildrenelements" id="ref-for-dom-sanitizerconfig-replacewithchildrenelements⑥">replaceWithChildrenElements</a></code>"] do:</p>
+      <ol>
+       <li data-md>
+        <p>Call <a data-link-type="dfn" href="#sanitizer-replace-an-element-with-its-children" id="ref-for-sanitizer-replace-an-element-with-its-children①">replace an element with its children</a> with <var>element</var> and <var>sanitizer</var>.</p>
+      </ol>
      <li data-md>
-      <p>For each <var>key</var> of «[
- "<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-elements" id="ref-for-dom-sanitizerconfig-elements②⓪">elements</a></code>",
- "<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-removeelements" id="ref-for-dom-sanitizerconfig-removeelements①①">removeElements</a></code>",
- "<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-replacewithchildrenelements" id="ref-for-dom-sanitizerconfig-replacewithchildrenelements⑧">replaceWithChildrenElements</a></code>" ]»:</p>
+      <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-iterate" id="ref-for-list-iterate⑧">For each</a> <var>attribute</var> of <var>configuration</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-attributes" id="ref-for-dom-sanitizerconfig-attributes④">attributes</a></code>"] do:</p>
       <ol>
        <li data-md>
-        <p>If <var>config</var>[<var>key</var>] exists, set <var>result</var>[<var>key</var>] to the result of running <a data-link-type="dfn" href="#canonicalize-a-sanitizer-element-list" id="ref-for-canonicalize-a-sanitizer-element-list①">canonicalize a sanitizer element list</a> on <var>config</var>[<var>key</var>] with <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#html-namespace" id="ref-for-html-namespace③">HTML namespace</a> as the default namespace.</p>
+        <p>Call <a data-link-type="dfn" href="#sanitizer-allow-an-attribute" id="ref-for-sanitizer-allow-an-attribute①">allow an attribute</a> with <var>attribute</var> and <var>sanitizer</var>.</p>
       </ol>
      <li data-md>
-      <p>For each <var>key</var> of «[
- "<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-attributes" id="ref-for-dom-sanitizerconfig-attributes①②">attributes</a></code>",
- "<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-removeattributes" id="ref-for-dom-sanitizerconfig-removeattributes①⓪">removeAttributes</a></code>" ]»:</p>
+      <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-iterate" id="ref-for-list-iterate⑨">For each</a> <var>attribute</var> of <var>configuration</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-removeattributes" id="ref-for-dom-sanitizerconfig-removeattributes⑤">removeAttributes</a></code>"] do:</p>
       <ol>
        <li data-md>
-        <p>If <var>config</var>[<var>key</var>] exists, set <var>result</var>[<var>key</var>] to the result of running <a data-link-type="dfn" href="#canonicalize-a-sanitizer-element-list" id="ref-for-canonicalize-a-sanitizer-element-list②">canonicalize a sanitizer element list</a> on <var>config</var>[<var>key</var>] with <code>null</code> as
- the default namespace.</p>
+        <p>Call <a data-link-type="dfn" href="#sanitizer-remove-an-attribute" id="ref-for-sanitizer-remove-an-attribute②">remove an attribute</a> with <var>attribute</var> and <var>sanitizer</var>.</p>
       </ol>
      <li data-md>
-      <p>Set <var>result</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-comments" id="ref-for-dom-sanitizerconfig-comments③">comments</a></code>"] to <var>config</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-comments" id="ref-for-dom-sanitizerconfig-comments④">comments</a></code>"].</p>
+      <p>Call <a data-link-type="dfn" href="#sanitizer-set-comments" id="ref-for-sanitizer-set-comments①">set comments</a> with <var>configuration</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-comments" id="ref-for-dom-sanitizerconfig-comments②">comments</a></code>"] and <var>sanitizer</var>.</p>
      <li data-md>
-      <p>Let <var>default</var> be the result of <a data-link-type="dfn" href="#canonicalize-a-configuration" id="ref-for-canonicalize-a-configuration③">canonicalizing a configuration</a> for the <a data-link-type="dfn" href="#built-in-default-config" id="ref-for-built-in-default-config⑤">built-in default config</a>.</p>
+      <p>Call <a data-link-type="dfn" href="#sanitizer-set-data-attributes" id="ref-for-sanitizer-set-data-attributes①">set data attributes</a> with <var>configuration</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-dataattributes" id="ref-for-dom-sanitizerconfig-dataattributes②">dataAttributes</a></code>"] and <var>sanitizer</var>.</p>
      <li data-md>
-      <p>If <var>safe</var>:</p>
-      <ol>
+      <p>Return whether all of the following are true:</p>
+      <ul>
        <li data-md>
-        <p>If <var>config</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-elements" id="ref-for-dom-sanitizerconfig-elements②①">elements</a></code>"] <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#map-exists" id="ref-for-map-exists⑧">exists</a>:</p>
-        <ol>
-         <li data-md>
-          <p>Let <var>elementBlockList</var> be the <a data-link-type="dfn" href="#set-difference" id="ref-for-set-difference①">difference</a> between <a data-link-type="dfn" href="#known-elements" id="ref-for-known-elements③">known elements</a> <var>default</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-elements" id="ref-for-dom-sanitizerconfig-elements②②">elements</a></code>"].</p>
-          <p class="note" role="note"><span class="marker">Note:</span> The "natural" way to enforce the default element list would be
-       to intersect with it. But that would also eliminate any unknown
-       (i.e., non-HTML supplied element, like &lt;foo>). So we
-       construct this helper to be able to use it to subtract any "unsafe"
-       elements.</p>
-         <li data-md>
-          <p>Set <var>result</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-elements" id="ref-for-dom-sanitizerconfig-elements②③">elements</a></code>"] to the <a data-link-type="dfn" href="#set-difference" id="ref-for-set-difference②">difference</a> of <var>result</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-elements" id="ref-for-dom-sanitizerconfig-elements②④">elements</a></code>"] and <var>elementBlockList</var>.</p>
-        </ol>
+        <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-size" id="ref-for-list-size">size</a> of <var>configuration</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-elements" id="ref-for-dom-sanitizerconfig-elements⑨">elements</a></code>"] equals <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-size" id="ref-for-list-size①">size</a> of <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#this" id="ref-for-this②⑥">this</a>'s <a data-link-type="dfn" href="#sanitizer-configuration" id="ref-for-sanitizer-configuration①①">configuration</a>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-elements" id="ref-for-dom-sanitizerconfig-elements①⓪">elements</a></code>"].</p>
        <li data-md>
-        <p>If <var>config</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-removeelements" id="ref-for-dom-sanitizerconfig-removeelements①②">removeElements</a></code>"] <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#map-exists" id="ref-for-map-exists⑨">exists</a>:</p>
-        <ol>
-         <li data-md>
-          <p>Set <var>result</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-elements" id="ref-for-dom-sanitizerconfig-elements②⑤">elements</a></code>"] to the <a data-link-type="dfn" href="#set-difference" id="ref-for-set-difference③">difference</a> of <var>default</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-elements" id="ref-for-dom-sanitizerconfig-elements②⑥">elements</a></code>"]
-  and <var>result</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-removeelements" id="ref-for-dom-sanitizerconfig-removeelements①③">removeElements</a></code>"].</p>
-         <li data-md>
-          <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-remove" id="ref-for-list-remove">Remove</a> "<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-removeelements" id="ref-for-dom-sanitizerconfig-removeelements①④">removeElements</a></code>" from <var>result</var>.</p>
-        </ol>
+        <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-size" id="ref-for-list-size②">size</a> of <var>configuration</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-removeelements" id="ref-for-dom-sanitizerconfig-removeelements⑧">removeElements</a></code>"] equals <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-size" id="ref-for-list-size③">size</a> of <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#this" id="ref-for-this②⑦">this</a>'s <a data-link-type="dfn" href="#sanitizer-configuration" id="ref-for-sanitizer-configuration①②">configuration</a>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-removeelements" id="ref-for-dom-sanitizerconfig-removeelements⑨">removeElements</a></code>"].</p>
        <li data-md>
-        <p>If neither <var>config</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-elements" id="ref-for-dom-sanitizerconfig-elements②⑦">elements</a></code>"] nor <var>config</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-removeelements" id="ref-for-dom-sanitizerconfig-removeelements①⑤">removeElements</a></code>"] <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#map-exists" id="ref-for-map-exists①⓪">exist</a>:</p>
-        <ol>
-         <li data-md>
-          <p>Set <var>result</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-elements" id="ref-for-dom-sanitizerconfig-elements②⑧">elements</a></code>"] to <var>default</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-elements" id="ref-for-dom-sanitizerconfig-elements②⑨">elements</a></code>"].</p>
-        </ol>
+        <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-size" id="ref-for-list-size④">size</a> of <var>configuration</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-replacewithchildrenelements" id="ref-for-dom-sanitizerconfig-replacewithchildrenelements⑦">replaceWithChildrenElements</a></code>"] equals <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-size" id="ref-for-list-size⑤">size</a> of <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#this" id="ref-for-this②⑧">this</a>'s <a data-link-type="dfn" href="#sanitizer-configuration" id="ref-for-sanitizer-configuration①③">configuration</a>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-replacewithchildrenelements" id="ref-for-dom-sanitizerconfig-replacewithchildrenelements⑧">replaceWithChildrenElements</a></code>"].</p>
        <li data-md>
-        <p>If <var>config</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-attributes" id="ref-for-dom-sanitizerconfig-attributes①③">attributes</a></code>"] <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#map-exists" id="ref-for-map-exists①①">exists</a>:</p>
-        <ol>
-         <li data-md>
-          <p>Let <var>attributeBlockList</var> be the <a data-link-type="dfn" href="#set-difference" id="ref-for-set-difference④">difference</a> between <a data-link-type="dfn" href="#known-attributes" id="ref-for-known-attributes③">known attributes</a> and <var>default</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-attributes" id="ref-for-dom-sanitizerconfig-attributes①④">attributes</a></code>"];</p>
-         <li data-md>
-          <p>Set <var>result</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-attributes" id="ref-for-dom-sanitizerconfig-attributes①⑤">attributes</a></code>"] to the <a data-link-type="dfn" href="#set-difference" id="ref-for-set-difference⑤">difference</a> of <var>result</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-attributes" id="ref-for-dom-sanitizerconfig-attributes①⑥">attributes</a></code>"] and <var>attributeBlockList</var>.</p>
-        </ol>
+        <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-size" id="ref-for-list-size⑥">size</a> of <var>configuration</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-attributes" id="ref-for-dom-sanitizerconfig-attributes⑤">attributes</a></code>"] equals <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-size" id="ref-for-list-size⑦">size</a> of <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#this" id="ref-for-this②⑨">this</a>'s <a data-link-type="dfn" href="#sanitizer-configuration" id="ref-for-sanitizer-configuration①④">configuration</a>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-attributes" id="ref-for-dom-sanitizerconfig-attributes⑥">attributes</a></code>"].</p>
        <li data-md>
-        <p>If <var>config</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-removeattributes" id="ref-for-dom-sanitizerconfig-removeattributes①①">removeAttributes</a></code>"] <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#map-exists" id="ref-for-map-exists①②">exists</a>:</p>
-        <ol>
-         <li data-md>
-          <p>Set <var>result</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-attributes" id="ref-for-dom-sanitizerconfig-attributes①⑦">attributes</a></code>"] to the <a data-link-type="dfn" href="#set-difference" id="ref-for-set-difference⑥">difference</a> of <var>default</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-attributes" id="ref-for-dom-sanitizerconfig-attributes①⑧">attributes</a></code>"]
-  and <var>result</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-removeattributes" id="ref-for-dom-sanitizerconfig-removeattributes①②">removeAttributes</a></code>"].</p>
-         <li data-md>
-          <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-remove" id="ref-for-list-remove①">Remove</a> "<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-removeattributes" id="ref-for-dom-sanitizerconfig-removeattributes①③">removeAttributes</a></code>" from <var>result</var>.</p>
-        </ol>
+        <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-size" id="ref-for-list-size⑧">size</a> of <var>configuration</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-removeattributes" id="ref-for-dom-sanitizerconfig-removeattributes⑥">removeAttributes</a></code>"] equals <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-size" id="ref-for-list-size⑨">size</a> of <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#this" id="ref-for-this③⓪">this</a>'s <a data-link-type="dfn" href="#sanitizer-configuration" id="ref-for-sanitizer-configuration①⑤">configuration</a>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-removeattributes" id="ref-for-dom-sanitizerconfig-removeattributes⑦">removeAttributes</a></code>"].</p>
        <li data-md>
-        <p>If neither <var>config</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-attributes" id="ref-for-dom-sanitizerconfig-attributes①⑨">attributes</a></code>"] nor <var>config</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-removeattributes" id="ref-for-dom-sanitizerconfig-removeattributes①④">removeAttributes</a></code>"] <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#map-exists" id="ref-for-map-exists①③">exist</a>:</p>
-        <ol>
-         <li data-md>
-          <p>Set <var>result</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-attributes" id="ref-for-dom-sanitizerconfig-attributes②⓪">attributes</a></code>"] to <var>default</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-attributes" id="ref-for-dom-sanitizerconfig-attributes②①">attributes</a></code>"].</p>
-        </ol>
-      </ol>
+        <p>Either <var>configuration</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-elements" id="ref-for-dom-sanitizerconfig-elements①①">elements</a></code>"] or <var>configuration</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-removeelements" id="ref-for-dom-sanitizerconfig-removeelements①⓪">removeElements</a></code>"] <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#map-exists" id="ref-for-map-exists①">exist</a>,
+or neither, but not both.</p>
+       <li data-md>
+        <p>Either <var>configuration</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-attributes" id="ref-for-dom-sanitizerconfig-attributes⑦">attributes</a></code>"] or <var>configuration</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-removeattributes" id="ref-for-dom-sanitizerconfig-removeattributes⑧">removeAttributes</a></code>"] <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#map-exists" id="ref-for-map-exists②">exist</a>,
+or neither, but not both.</p>
+      </ul>
+    </ol>
+    <p class="note" role="note"><span class="marker">Note:</span> Previous versions of this spec had elaborate definitions of how to
+  canonicalize a config. This has now effectively been moved into the method
+  definitions.</p>
+    <p class="note" role="note"><span class="marker">Note:</span> This operation is defined in terms of the manipulation methods on the <code class="idl"><a data-link-type="idl" href="#sanitizer" id="ref-for-sanitizer①⓪">Sanitizer</a></code>. Those methods remove matching entries from other lists.
+    The size equality steps in the last step would then catch this.
+    For example: <code>{ allow: ["div", "div"] }</code> would create a Sanitizer with one element in
+    the allow list. The final test would then return false, which would cause
+    the caller to throw an exception.</p>
+    <p class="issue" id="issue-d2a3ab76"><a class="self-link" href="#issue-d2a3ab76"></a> This is still missing error checks for the per-element attribute lists
+    and syntax errors.</p>
+   </div>
+   <div class="algorithm" data-algorithm="canonicalize a sanitizer element with attributes">
+     In order to <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="canonicalize-a-sanitizer-element-with-attributes">canonicalize a sanitizer element with attributes</dfn> a <code class="idl"><a data-link-type="idl" href="#typedefdef-sanitizerelementwithattributes" id="ref-for-typedefdef-sanitizerelementwithattributes②">SanitizerElementWithAttributes</a></code> <var>element</var>, do this: 
+    <ol>
+     <li data-md>
+      <p>Let <var>result</var> be the result of <a data-link-type="dfn" href="#canonicalize-a-sanitizer-element" id="ref-for-canonicalize-a-sanitizer-element②">canonicalize a sanitizer element</a> with <var>element</var>.</p>
      <li data-md>
-      <p>Else (if not <var>safe</var>):</p>
+      <p>If <var>element</var> is a <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#dfn-dictionary" id="ref-for-dfn-dictionary⑥">dictionary</a>:</p>
       <ol>
        <li data-md>
-        <p>If neither <var>config</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-elements" id="ref-for-dom-sanitizerconfig-elements③⓪">elements</a></code>"] nor <var>config</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-removeelements" id="ref-for-dom-sanitizerconfig-removeelements①⑥">removeElements</a></code>"] <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#map-exists" id="ref-for-map-exists①④">exist</a>:</p>
+        <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-iterate" id="ref-for-list-iterate①⓪">For each</a> <var>attribute</var> in <var>element</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerelementnamespacewithattributes-attributes" id="ref-for-dom-sanitizerelementnamespacewithattributes-attributes①">attributes</a></code>"]:</p>
         <ol>
          <li data-md>
-          <p>Set <var>result</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-elements" id="ref-for-dom-sanitizerconfig-elements③①">elements</a></code>"] to <var>default</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-elements" id="ref-for-dom-sanitizerconfig-elements③②">elements</a></code>"].</p>
+          <p><a data-link-type="dfn" href="#sanitizerconfig-add" id="ref-for-sanitizerconfig-add④">Add</a> the result of <a data-link-type="dfn" href="#canonicalize-a-sanitizer-attribute" id="ref-for-canonicalize-a-sanitizer-attribute②">canonicalize a sanitizer attribute</a> with <var>attribute</var> to <var>result</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerelementnamespacewithattributes-attributes" id="ref-for-dom-sanitizerelementnamespacewithattributes-attributes②">attributes</a></code>"].</p>
         </ol>
        <li data-md>
-        <p>If neither <var>config</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-attributes" id="ref-for-dom-sanitizerconfig-attributes②②">attributes</a></code>"] nor <var>config</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-removeattributes" id="ref-for-dom-sanitizerconfig-removeattributes①⑤">removeAttributes</a></code>"] <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#map-exists" id="ref-for-map-exists①⑤">exist</a>:</p>
+        <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-iterate" id="ref-for-list-iterate①①">For each</a> <var>attribute</var> in <var>element</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerelementnamespacewithattributes-removeattributes" id="ref-for-dom-sanitizerelementnamespacewithattributes-removeattributes①">removeAttributes</a></code>"]:</p>
         <ol>
          <li data-md>
-          <p>Set <var>result</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-attributes" id="ref-for-dom-sanitizerconfig-attributes②③">attributes</a></code>"] to <var>default</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerconfig-attributes" id="ref-for-dom-sanitizerconfig-attributes②④">attributes</a></code>"].</p>
+          <p><a data-link-type="dfn" href="#sanitizerconfig-add" id="ref-for-sanitizerconfig-add⑤">Add</a> the result of <a data-link-type="dfn" href="#canonicalize-a-sanitizer-attribute" id="ref-for-canonicalize-a-sanitizer-attribute③">canonicalize a sanitizer attribute</a> with <var>attribute</var> to <var>result</var>["<code class="idl"><a data-link-type="idl" href="#dom-sanitizerelementnamespacewithattributes-removeattributes" id="ref-for-dom-sanitizerelementnamespacewithattributes-removeattributes②">removeAttributes</a></code>"].</p>
         </ol>
       </ol>
-     <li data-md>
-      <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#assert" id="ref-for-assert⑦">Assert</a>: <var>result</var> is <a data-link-type="dfn" href="#sanitizerconfig-valid" id="ref-for-sanitizerconfig-valid②">valid</a>.</p>
-     <li data-md>
-      <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#assert" id="ref-for-assert⑧">Assert</a>: <var>result</var> is <a data-link-type="dfn" href="#sanitizerconfig-canonical" id="ref-for-sanitizerconfig-canonical⑤">canonical</a>.</p>
-     <li data-md>
-      <p>Return <var>result</var>.</p>
-    </ol>
-   </div>
-   <div class="algorithm" data-algorithm="canonicalize a sanitizer element list">
-     In order to <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="canonicalize-a-sanitizer-element-list">canonicalize a sanitizer element list</dfn> <var>list</var>, with a
-default namespace <var>defaultNamespace</var>, run the following steps: 
-    <ol>
-     <li data-md>
-      <p>Let <var>result</var> be a new <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#ordered-set" id="ref-for-ordered-set">ordered set</a>.</p>
-     <li data-md>
-      <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-iterate" id="ref-for-list-iterate⑨">For each</a> <var>name</var> in <var>list</var>, call <a data-link-type="dfn" href="#canonicalize-a-sanitizer-name" id="ref-for-canonicalize-a-sanitizer-name">canonicalize a sanitizer name</a> on <var>name</var> with <var>defaultNamespace</var> and <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#set-append" id="ref-for-set-append">append</a> to <var>result</var>.</p>
      <li data-md>
       <p>Return <var>result</var>.</p>
     </ol>
    </div>
+   <div class="algorithm" data-algorithm="canonicalize a sanitizer element"> In order to <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="canonicalize-a-sanitizer-element">canonicalize a sanitizer element</dfn> a <code class="idl"><a data-link-type="idl" href="#typedefdef-sanitizerelement" id="ref-for-typedefdef-sanitizerelement④">SanitizerElement</a></code> <var>element</var>,
+return the result of <a data-link-type="dfn" href="#canonicalize-a-sanitizer-name" id="ref-for-canonicalize-a-sanitizer-name">canonicalize a sanitizer name</a> with <var>element</var> and the <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#html-namespace" id="ref-for-html-namespace②">HTML namespace</a> as the default namespace. </div>
+   <div class="algorithm" data-algorithm="canonicalize a sanitizer attribute"> In order to <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="canonicalize-a-sanitizer-attribute">canonicalize a sanitizer attribute</dfn> a <code class="idl"><a data-link-type="idl" href="#typedefdef-sanitizerattribute" id="ref-for-typedefdef-sanitizerattribute⑥">SanitizerAttribute</a></code> <var>attribute</var>, 
+return the result of <a data-link-type="dfn" href="#canonicalize-a-sanitizer-name" id="ref-for-canonicalize-a-sanitizer-name①">canonicalize a sanitizer name</a> with <var>attribute</var> and <code>null</code> as the default namespace. </div>
    <div class="algorithm" data-algorithm="canonicalize a sanitizer name">
      In order to <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="canonicalize-a-sanitizer-name">canonicalize a sanitizer name</dfn> <var>name</var>, with a default
 namespace <var>defaultNamespace</var>, run the following steps: 
     <ol>
      <li data-md>
-      <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#assert" id="ref-for-assert⑨">Assert</a>: <var>name</var> is either a <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString①④">DOMString</a></code> or a <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#dfn-dictionary" id="ref-for-dfn-dictionary①①">dictionary</a>.</p>
+      <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#assert" id="ref-for-assert⑥">Assert</a>: <var>name</var> is either a <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString①④">DOMString</a></code> or a <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#dfn-dictionary" id="ref-for-dfn-dictionary⑦">dictionary</a>.</p>
      <li data-md>
       <p>If <var>name</var> is a <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString①⑤">DOMString</a></code>, then return «[ "<code>name</code>" → <var>name</var>, "<code>namespace</code>" → <var>defaultNamespace</var>]».</p>
      <li data-md>
-      <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#assert" id="ref-for-assert①⓪">Assert</a>: <var>name</var> is a <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#dfn-dictionary" id="ref-for-dfn-dictionary①②">dictionary</a> and <var>name</var>["name"] <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#map-exists" id="ref-for-map-exists①⑥">exists</a>.</p>
+      <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#assert" id="ref-for-assert⑦">Assert</a>: <var>name</var> is a <a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#dfn-dictionary" id="ref-for-dfn-dictionary⑧">dictionary</a> and <var>name</var>["name"] <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#map-exists" id="ref-for-map-exists③">exists</a>.</p>
      <li data-md>
-      <p>Return «[ <br> "<code>name</code>" → <var>name</var>["name"], <br> "<code>namespace</code>" → <var>name</var>["namespace"] if it <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#map-exists" id="ref-for-map-exists①⑦">exists</a>, otherwise <var>defaultNamespace</var> <br> ]».</p>
+      <p>Return «[ <br> "<code>name</code>" → <var>name</var>["name"], <br> "<code>namespace</code>" → ( <var>name</var>["namespace"] if it <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#map-exists" id="ref-for-map-exists④">exists</a>, otherwise <var>defaultNamespace</var> ) <br> ]».</p>
     </ol>
    </div>
    <h3 class="heading settled" data-level="3.3" id="alg-support"><span class="secno">3.3. </span><span class="content">Supporting Algorithms</span><a class="self-link" href="#alg-support"></a></h3>
-   <div class="algorithm" data-algorithm="contains" data-algorithm-for="SanitizerConfig"> For the <a data-link-type="dfn" href="#canonicalize-a-sanitizer-name" id="ref-for-canonicalize-a-sanitizer-name①">canonicalized</a> <code class="idl"><a data-link-type="idl" href="#dictdef-sanitizerelementnamespace" id="ref-for-dictdef-sanitizerelementnamespace③">element</a></code> and <code class="idl"><a data-link-type="idl" href="#dictdef-sanitizerattributenamespace" id="ref-for-dictdef-sanitizerattributenamespace②">attribute name</a></code> lists
+   <p>For the <a data-link-type="dfn" href="#canonicalize-a-sanitizer-name" id="ref-for-canonicalize-a-sanitizer-name②">canonicalized</a> <code class="idl"><a data-link-type="idl" href="#dictdef-sanitizerelementnamespace" id="ref-for-dictdef-sanitizerelementnamespace③">element</a></code> and <code class="idl"><a data-link-type="idl" href="#dictdef-sanitizerattributenamespace" id="ref-for-dictdef-sanitizerattributenamespace②">attribute name</a></code> lists
 used in this spec, list membership is based on matching both "<code>name</code>" and "<code>namespace</code>"
-entries:
-A Sanitizer name <var>list</var> <dfn class="dfn-paneled" data-dfn-for="SanitizerConfig" data-dfn-type="dfn" data-noexport id="sanitizerconfig-contains">contains</dfn> an <var>item</var> if there exists an <var>entry</var> of <var>list</var> that is an <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#ordered-map" id="ref-for-ordered-map">ordered map</a>, and where <var>item</var>["name"] <a data-link-type="dfn" href="#set-equal" id="ref-for-set-equal③">equals</a> <var>entry</var>["name"] and <var>item</var>["namespace"] <a data-link-type="dfn" href="#set-equal" id="ref-for-set-equal④">equals</a> <var>entry</var>["namespace"]. </div>
-   <div class="algorithm" data-algorithm="difference" data-algorithm-for="set">
-     Set difference (or set subtraction) is a clone of a set A, but with all members
-removed that occur in a set B:
-To compute the <dfn class="dfn-paneled" data-dfn-for="set" data-dfn-type="dfn" data-noexport id="set-difference">difference</dfn> of two <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#ordered-set" id="ref-for-ordered-set①">ordered sets</a> <var>A</var> and <var>B</var>: 
+entries:</p>
+   <div class="algorithm" data-algorithm="contains" data-algorithm-for="SanitizerConfig"> A Sanitizer name <var>list</var> <dfn class="dfn-paneled" data-dfn-for="SanitizerConfig" data-dfn-type="dfn" data-noexport id="sanitizerconfig-contains">contains</dfn> an <var>item</var> if there exists an <var>entry</var> of <var>list</var> that is an <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#ordered-map" id="ref-for-ordered-map">ordered map</a>, and where <var>item</var>["name"] <a data-link-type="dfn" href="#set-equal" id="ref-for-set-equal①">equals</a> <var>entry</var>["name"] and <var>item</var>["namespace"] <a data-link-type="dfn" href="#set-equal" id="ref-for-set-equal②">equals</a> <var>entry</var>["namespace"]. </div>
+   <div class="algorithm" data-algorithm="remove" data-algorithm-for="SanitizerConfig"> To <dfn class="dfn-paneled" data-dfn-for="SanitizerConfig" data-dfn-type="dfn" data-noexport id="sanitizerconfig-remove">remove</dfn> an <var>item</var> from a <var>list</var> that is an <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#ordered-map" id="ref-for-ordered-map①">ordered map</a>, <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-remove" id="ref-for-list-remove">remove</a> all <var>entry</var> from <var>list</var> where <var>item</var>["name"] <a data-link-type="dfn" href="#set-equal" id="ref-for-set-equal③">equals</a> <var>entry</var>["name"] and <var>item</var>["namespace"] <a data-link-type="dfn" href="#set-equal" id="ref-for-set-equal④">equals</a> <var>entry</var>["namespace"]. </div>
+   <div class="algorithm" data-algorithm="add" data-algorithm-for="SanitizerConfig">
+     To <dfn class="dfn-paneled" data-dfn-for="SanitizerConfig" data-dfn-type="dfn" data-noexport id="sanitizerconfig-add">add</dfn> a <var>name</var> to a <var>list</var>, where <var>name</var> is <a data-link-type="dfn" href="#canonicalize-a-sanitizer-name" id="ref-for-canonicalize-a-sanitizer-name③">canonicalized</a> and <var>list</var> is an <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#ordered-map" id="ref-for-ordered-map②">ordered map</a>: 
     <ol>
      <li data-md>
-      <p>Let <var>set</var> be a new <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#ordered-set" id="ref-for-ordered-set②">ordered set</a>.</p>
+      <p>If <var>list</var> <a data-link-type="dfn" href="#sanitizerconfig-contains" id="ref-for-sanitizerconfig-contains⑦">contains</a> <var>name</var>, then return.</p>
      <li data-md>
-      <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-iterate" id="ref-for-list-iterate①⓪">For each</a> <var>item</var> of <var>A</var>:</p>
-      <ol>
-       <li data-md>
-        <p>If <var>B</var> does not <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-contain" id="ref-for-list-contain④">contain</a> <var>item</var>, then <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#set-append" id="ref-for-set-append①">append</a> <var>item</var> to <var>set</var>.</p>
-      </ol>
-     <li data-md>
-      <p>Return <var>set</var>.</p>
+      <p><a data-link-type="dfn" href="https://infra.spec.whatwg.org/#list-append" id="ref-for-list-append②">Append</a> <var>name</var> to <var>list</var>.</p>
     </ol>
    </div>
-   <div class="algorithm" data-algorithm="equal" data-algorithm-for="set"> Equality for <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#ordered-set" id="ref-for-ordered-set③">ordered sets</a> is equality of its members, but without
-regard to order: <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#ordered-set" id="ref-for-ordered-set④">Ordered sets</a> <var>A</var> and <var>B</var> are <dfn class="dfn-paneled" data-dfn-for="set" data-dfn-type="dfn" data-noexport id="set-equal">equal</dfn> if both <var>A</var> is a <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#set-superset" id="ref-for-set-superset">superset</a> of <var>B</var> and <var>B</var> is a <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#set-superset" id="ref-for-set-superset①">superset</a> of <var>A</var>. </div>
+   <div class="algorithm" data-algorithm="equal" data-algorithm-for="set"> Equality for <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#ordered-set" id="ref-for-ordered-set">ordered sets</a> is equality of its members, but without
+regard to order: <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#ordered-set" id="ref-for-ordered-set①">Ordered sets</a> <var>A</var> and <var>B</var> are <dfn class="dfn-paneled" data-dfn-for="set" data-dfn-type="dfn" data-noexport id="set-equal">equal</dfn> if both <var>A</var> is a <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#set-superset" id="ref-for-set-superset">superset</a> of <var>B</var> and <var>B</var> is a <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#set-superset" id="ref-for-set-superset①">superset</a> of <var>A</var>. </div>
    <h3 class="heading settled" data-level="3.4" id="sanitization-defaults"><span class="secno">3.4. </span><span class="content">Defaults</span><a class="self-link" href="#sanitization-defaults"></a></h3>
-   <p class="note" role="note"><span class="marker">Note:</span> The defaults should follow a certain form, which is checked for at the
-      beginning of <a data-link-type="dfn" href="#canonicalize-a-configuration" id="ref-for-canonicalize-a-configuration④">canonicalize a configuration</a>.</p>
-   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="built-in-default-config">built-in default config</dfn> is as follows:</p>
+   <p>There are four builtins:</p>
+   <ul>
+    <li data-md>
+     <p>The <a data-link-type="dfn" href="#built-in-safe-default-configuration" id="ref-for-built-in-safe-default-configuration">built-in safe default configuration</a>,</p>
+    <li data-md>
+     <p>the <a data-link-type="dfn" href="#built-in-unsafe-default-configuration" id="ref-for-built-in-unsafe-default-configuration">built-in unsafe default configuration</a>,</p>
+    <li data-md>
+     <p>the <a data-link-type="dfn" href="#built-in-safe-baseline-configuration" id="ref-for-built-in-safe-baseline-configuration③">built-in safe baseline configuration</a>, and</p>
+    <li data-md>
+     <p>the <a data-link-type="dfn" href="#navigating-url-attributes-list" id="ref-for-navigating-url-attributes-list①">navigating URL attributes list</a>.</p>
+   </ul>
+   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="built-in-safe-default-configuration">built-in safe default configuration</dfn> is the same as the <a data-link-type="dfn" href="#built-in-safe-baseline-configuration" id="ref-for-built-in-safe-baseline-configuration④">built-in safe baseline configuration</a>.</p>
+   <p class="issue" id="issue-6d9aace7"><a class="self-link" href="#issue-6d9aace7"></a> Determine if this actually holds. <a href="https://github.com/WICG/sanitizer-api/issues/233">[Issue #233]</a></p>
+   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="built-in-unsafe-default-configuration">built-in unsafe default configuration</dfn> is meant to allow anything.
+It is as follows:</p>
 <pre>{
-  elements: [....],
-  attributes: [....],
-  comments: true,
+  allow: [],
+  removeElements: [],
+  attributes: [],
+  removeAttributes: [],
 }
 </pre>
-   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="known-elements">known elements</dfn> are as follows:</p>
-<pre>[
-  { name: "div", namespace: "http://www.w3.org/1999/xhtml" },
-  ...
-]
-</pre>
-   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="known-attributes">known attributes</dfn> are as follows:</p>
-<pre>[
-  { name: "class", namespace: null },
-  ...
-]
+   <p>The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="built-in-safe-baseline-configuration">built-in safe baseline configuration</dfn> is meant to block only
+script-content, and nothing else. It is as follows:</p>
+<pre>{
+  removeElements: [
+    { name: "script", namespace: "http://www.w3.org/1999/xhtml" },
+    { name: "script", namespace: "http://www.w3.org/2000/svg" }
+  ],
+  removeAttributes: [....],
+}
 </pre>
-   <p class="note" role="note"><span class="marker">Note:</span> The <a data-link-type="dfn" href="#known-elements" id="ref-for-known-elements④">known elements</a> and <a data-link-type="dfn" href="#known-attributes" id="ref-for-known-attributes④">known attributes</a> should be derived from the
-      HTML5 specification, rather than being explicitly listed here. Currently,
-      there are no mechanics to do so.</p>
    <div>
      The <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="navigating-url-attributes-list">navigating URL attributes list</dfn>, for which "<code>javascript:</code>"
-navigations are unsafe, are as follows: 
+navigations are "unsafe", are as follows: 
     <p>«[ <br> [
-    { "<code>name</code>" → "<code>a</code>", "<code>namespace</code>" → "<a data-link-type="dfn" href="https://infra.spec.whatwg.org/#html-namespace" id="ref-for-html-namespace④">HTML namespace</a>" },
+    { "<code>name</code>" → "<code>a</code>", "<code>namespace</code>" → <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#html-namespace" id="ref-for-html-namespace③">HTML namespace</a> },
     { "<code>name</code>" → "<code>href</code>", "<code>namespace</code>" → <code>null</code> }
   ], <br> [
-    { "<code>name</code>" → "<code>area</code>", "<code>namespace</code>" → "<a data-link-type="dfn" href="https://infra.spec.whatwg.org/#html-namespace" id="ref-for-html-namespace⑤">HTML namespace</a>" },
+    { "<code>name</code>" → "<code>area</code>", "<code>namespace</code>" → <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#html-namespace" id="ref-for-html-namespace④">HTML namespace</a> },
     { "<code>name</code>" → "<code>href</code>", "<code>namespace</code>" → <code>null</code> }
   ], <br> [
-    { "<code>name</code>" → "<code>form</code>", "<code>namespace</code>" → "<a data-link-type="dfn" href="https://infra.spec.whatwg.org/#html-namespace" id="ref-for-html-namespace⑥">HTML namespace</a>" },
+    { "<code>name</code>" → "<code>form</code>", "<code>namespace</code>" → <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#html-namespace" id="ref-for-html-namespace⑤">HTML namespace</a> },
     { "<code>name</code>" → "<code>action</code>", "<code>namespace</code>" → <code>null</code> }
   ], <br> [
-    { "<code>name</code>" → "<code>input</code>", "<code>namespace</code>" → "<a data-link-type="dfn" href="https://infra.spec.whatwg.org/#html-namespace" id="ref-for-html-namespace⑦">HTML namespace</a>" },
+    { "<code>name</code>" → "<code>input</code>", "<code>namespace</code>" → <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#html-namespace" id="ref-for-html-namespace⑥">HTML namespace</a> },
     { "<code>name</code>" → "<code>formaction</code>", "<code>namespace</code>" → <code>null</code> }
   ], <br> [
-    { "<code>name</code>" → "<code>button</code>", "<code>namespace</code>" → "<a data-link-type="dfn" href="https://infra.spec.whatwg.org/#html-namespace" id="ref-for-html-namespace⑧">HTML namespace</a>" },
+    { "<code>name</code>" → "<code>button</code>", "<code>namespace</code>" → <a data-link-type="dfn" href="https://infra.spec.whatwg.org/#html-namespace" id="ref-for-html-namespace⑦">HTML namespace</a> },
     { "<code>name</code>" → "<code>formaction</code>", "<code>namespace</code>" → <code>null</code> }
   ], <br> ]»</p>
    </div>
@@ -1725,39 +1604,39 @@ <h2 class="heading settled" data-level="5" id="ack"><span class="secno">5. </spa
   <h2 class="no-num no-ref heading settled" id="index"><span class="content">Index</span><a class="self-link" href="#index"></a></h2>
   <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="content">Terms defined by this specification</span><a class="self-link" href="#index-defined-here"></a></h3>
   <ul class="index">
+   <li><a href="#sanitizerconfig-add">add</a><span>, in § 3.3</span>
+   <li><a href="#sanitizer-allow-an-attribute">allow an attribute</a><span>, in § 3.2</span>
+   <li><a href="#sanitizerconfig-allow-an-element">allow an element</a><span>, in § 3.2</span>
+   <li><a href="#sanitizer-allowattribute">allowAttribute</a><span>, in § 2.2</span>
+   <li><a href="#dom-sanitizer-allowattribute">allowAttribute(attribute)</a><span>, in § 2.2</span>
+   <li><a href="#sanitizer-allowelement">allowElement</a><span>, in § 2.2</span>
+   <li><a href="#dom-sanitizer-allowelement">allowElement(element)</a><span>, in § 2.2</span>
    <li>
     attributes
     <ul>
      <li><a href="#dom-sanitizerconfig-attributes">dict-member for SanitizerConfig</a><span>, in § 2.3</span>
      <li><a href="#dom-sanitizerelementnamespacewithattributes-attributes">dict-member for SanitizerElementNamespaceWithAttributes</a><span>, in § 2.3</span>
     </ul>
-   <li><a href="#built-in-default-config">built-in default config</a><span>, in § 3.4</span>
-   <li>
-    canonical
-    <ul>
-     <li><a href="#sanitizerconfig-canonical">dfn for SanitizerConfig</a><span>, in § 3.2</span>
-     <li><a href="#sanitizernamelist-canonical">dfn for SanitizerNameList</a><span>, in § 3.2</span>
-     <li><a href="#sanitizernamewithattributeslist-canonical">dfn for SanitizerNameWithAttributesList</a><span>, in § 3.2</span>
-    </ul>
-   <li><a href="#canonicalize-a-configuration">canonicalize a configuration</a><span>, in § 3.2</span>
-   <li><a href="#canonicalize-a-sanitizer-element-list">canonicalize a sanitizer element list</a><span>, in § 3.2</span>
+   <li><a href="#built-in-safe-baseline-configuration">built-in safe baseline configuration</a><span>, in § 3.4</span>
+   <li><a href="#built-in-safe-default-configuration">built-in safe default configuration</a><span>, in § 3.4</span>
+   <li><a href="#built-in-unsafe-default-configuration">built-in unsafe default configuration</a><span>, in § 3.4</span>
+   <li><a href="#canonicalize-a-sanitizer-attribute">canonicalize a sanitizer attribute</a><span>, in § 3.2</span>
+   <li><a href="#canonicalize-a-sanitizer-element">canonicalize a sanitizer element</a><span>, in § 3.2</span>
+   <li><a href="#canonicalize-a-sanitizer-element-with-attributes">canonicalize a sanitizer element with attributes</a><span>, in § 3.2</span>
    <li><a href="#canonicalize-a-sanitizer-name">canonicalize a sanitizer name</a><span>, in § 3.2</span>
    <li><a href="#dom-sanitizerconfig-comments">comments</a><span>, in § 2.3</span>
+   <li><a href="#sanitizer-configuration">configuration</a><span>, in § 2.2</span>
    <li><a href="#sanitizer-constructor">constructor</a><span>, in § 2.2</span>
    <li><a href="#dom-sanitizer-sanitizer">constructor()</a><span>, in § 2.2</span>
-   <li><a href="#dom-sanitizer-sanitizer">constructor(config)</a><span>, in § 2.2</span>
+   <li><a href="#dom-sanitizer-sanitizer">constructor(configuration)</a><span>, in § 2.2</span>
    <li><a href="#sanitizerconfig-contains">contains</a><span>, in § 3.3</span>
    <li><a href="#dom-sanitizerconfig-dataattributes">dataAttributes</a><span>, in § 2.3</span>
-   <li><a href="#set-difference">difference</a><span>, in § 3.3</span>
    <li><a href="#dom-sanitizerconfig-elements">elements</a><span>, in § 2.3</span>
    <li><a href="#set-equal">equal</a><span>, in § 3.3</span>
    <li><a href="#sanitizer-get">get</a><span>, in § 2.2</span>
    <li><a href="#dom-sanitizer-get">get()</a><span>, in § 2.2</span>
-   <li><a href="#sanitizerconfig-get-a-sanitizer-config-from-options">get a sanitizer config from options</a><span>, in § 3</span>
-   <li><a href="#sanitizer-getunsafe">getUnsafe</a><span>, in § 2.2</span>
-   <li><a href="#dom-sanitizer-getunsafe">getUnsafe()</a><span>, in § 2.2</span>
-   <li><a href="#known-attributes">known attributes</a><span>, in § 3.4</span>
-   <li><a href="#known-elements">known elements</a><span>, in § 3.4</span>
+   <li><a href="#sanitizerconfig-get-a-sanitizer-instance-from-options">get a sanitizer instance from options</a><span>, in § 3</span>
+   <li><a href="#handlejavascriptnavigationurls">handleJavascriptNavigationUrls</a><span>, in § 3.1</span>
    <li>
     name
     <ul>
@@ -1777,27 +1656,49 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
    <li><a href="#document-parsehtmlunsafe">parseHTMLUnsafe</a><span>, in § 2.1</span>
    <li><a href="#dom-document-parsehtmlunsafe">parseHTMLUnsafe(html)</a><span>, in § 2.1</span>
    <li><a href="#dom-document-parsehtmlunsafe">parseHTMLUnsafe(html, options)</a><span>, in § 2.1</span>
+   <li><a href="#sanitizerconfig-remove">remove</a><span>, in § 3.3</span>
+   <li><a href="#sanitizer-remove-an-attribute">remove an attribute</a><span>, in § 3.2</span>
+   <li><a href="#sanitizer-remove-an-element">remove an element</a><span>, in § 3.2</span>
+   <li><a href="#sanitizer-removeattribute">removeAttribute</a><span>, in § 2.2</span>
+   <li><a href="#dom-sanitizer-removeattribute">removeAttribute(attribute)</a><span>, in § 2.2</span>
    <li>
     removeAttributes
     <ul>
      <li><a href="#dom-sanitizerconfig-removeattributes">dict-member for SanitizerConfig</a><span>, in § 2.3</span>
      <li><a href="#dom-sanitizerelementnamespacewithattributes-removeattributes">dict-member for SanitizerElementNamespaceWithAttributes</a><span>, in § 2.3</span>
     </ul>
+   <li><a href="#sanitizer-removeelement">removeElement</a><span>, in § 2.2</span>
+   <li><a href="#dom-sanitizer-removeelement">removeElement(element)</a><span>, in § 2.2</span>
    <li><a href="#dom-sanitizerconfig-removeelements">removeElements</a><span>, in § 2.3</span>
+   <li><a href="#sanitizerconfig-remove-unsafe">remove unsafe</a><span>, in § 3.2</span>
+   <li><a href="#sanitizer-removeunsafe">removeUnsafe</a><span>, in § 2.2</span>
+   <li><a href="#dom-sanitizer-removeunsafe">removeUnsafe()</a><span>, in § 2.2</span>
+   <li><a href="#sanitizer-replace-an-element-with-its-children">replace an element with its children</a><span>, in § 3.2</span>
+   <li><a href="#sanitizer-replaceelementwithchildren">replaceElementWithChildren</a><span>, in § 2.2</span>
+   <li><a href="#dom-sanitizer-replaceelementwithchildren">replaceElementWithChildren(element)</a><span>, in § 2.2</span>
    <li><a href="#dom-sanitizerconfig-replacewithchildrenelements">replaceWithChildrenElements</a><span>, in § 2.3</span>
+   <li><a href="#safe-and-unsafe">Safe and unsafe</a><span>, in § 1.2</span>
    <li><a href="#sanitize">sanitize</a><span>, in § 3.1</span>
+   <li><a href="#sanitize-core">sanitize core</a><span>, in § 3.1</span>
    <li><a href="#sanitizer">Sanitizer</a><span>, in § 2.2</span>
    <li><a href="#dom-sethtmloptions-sanitizer">sanitizer</a><span>, in § 2.2</span>
    <li><a href="#dom-sanitizer-sanitizer">Sanitizer()</a><span>, in § 2.2</span>
    <li><a href="#typedefdef-sanitizerattribute">SanitizerAttribute</a><span>, in § 2.3</span>
    <li><a href="#dictdef-sanitizerattributenamespace">SanitizerAttributeNamespace</a><span>, in § 2.3</span>
-   <li><a href="#dom-sanitizer-sanitizer">Sanitizer(config)</a><span>, in § 2.2</span>
    <li><a href="#dictdef-sanitizerconfig">SanitizerConfig</a><span>, in § 2.3</span>
+   <li><a href="#dom-sanitizer-sanitizer">Sanitizer(configuration)</a><span>, in § 2.2</span>
    <li><a href="#typedefdef-sanitizerelement">SanitizerElement</a><span>, in § 2.3</span>
    <li><a href="#dictdef-sanitizerelementnamespace">SanitizerElementNamespace</a><span>, in § 2.3</span>
    <li><a href="#dictdef-sanitizerelementnamespacewithattributes">SanitizerElementNamespaceWithAttributes</a><span>, in § 2.3</span>
    <li><a href="#typedefdef-sanitizerelementwithattributes">SanitizerElementWithAttributes</a><span>, in § 2.3</span>
+   <li><a href="#sanitizer-set-a-configuration">set a configuration</a><span>, in § 3.2</span>
    <li><a href="#set-and-filter-html">set and filter HTML</a><span>, in § 3</span>
+   <li><a href="#sanitizer-set-comments">set comments</a><span>, in § 3.2</span>
+   <li><a href="#sanitizer-setcomments">setComments</a><span>, in § 2.2</span>
+   <li><a href="#dom-sanitizer-setcomments">setComments(allow)</a><span>, in § 2.2</span>
+   <li><a href="#sanitizer-set-data-attributes">set data attributes</a><span>, in § 3.2</span>
+   <li><a href="#sanitizer-setdataattributes">setDataAttributes</a><span>, in § 2.2</span>
+   <li><a href="#dom-sanitizer-setdataattributes">setDataAttributes(allow)</a><span>, in § 2.2</span>
    <li>
     setHTML
     <ul>
@@ -1835,20 +1736,13 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
      <li><a href="#dom-element-sethtmlunsafe">method for Element</a><span>, in § 2.1</span>
      <li><a href="#dom-shadowroot-sethtmlunsafe">method for ShadowRoot</a><span>, in § 2.1</span>
     </ul>
-   <li>
-    valid
-    <ul>
-     <li><a href="#sanitizerconfig-valid">dfn for SanitizerConfig</a><span>, in § 3.2</span>
-     <li><a href="#sanitizernamelist-valid">dfn for SanitizerNameList</a><span>, in § 3.2</span>
-    </ul>
   </ul>
   <h3 class="no-num no-ref heading settled" id="index-defined-elsewhere"><span class="content">Terms defined by reference</span><a class="self-link" href="#index-defined-elsewhere"></a></h3>
   <ul class="index">
    <li>
     <a data-link-type="biblio">[]</a> defines the following terms:
     <ul>
-     <li><span class="dfn-paneled" id="dd722468">internal slot</span>
-     <li><span class="dfn-paneled" id="769996cd">parse html from a string</span>
+     <li><span class="dfn-paneled" id="769996cd">parse HTML from a string</span>
      <li><span class="dfn-paneled" id="d354f084">window.toStaticHTML()</span>
     </ul>
    <li>
@@ -1892,33 +1786,24 @@ <h3 class="no-num no-ref heading settled" id="index-defined-elsewhere"><span cla
    <li>
     <a data-link-type="biblio">[INFRA]</a> defines the following terms:
     <ul>
-     <li><span class="dfn-paneled" id="53275e46">append <small>(for list)</small></span>
-     <li><span class="dfn-paneled" id="a3b18719">append <small>(for set)</small></span>
+     <li><span class="dfn-paneled" id="53275e46">append</span>
      <li><span class="dfn-paneled" id="77b4c09a">assert</span>
      <li><span class="dfn-paneled" id="36858240">boolean</span>
      <li><span class="dfn-paneled" id="4943545e">code unit prefix</span>
-     <li><span class="dfn-paneled" id="ae8def21">contain</span>
      <li><span class="dfn-paneled" id="f937b7b6">continue</span>
      <li><span class="dfn-paneled" id="03afaf9c">empty</span>
-     <li><span class="dfn-paneled" id="1243a891">exist</span>
-     <li><span class="dfn-paneled" id="f052b1ea">html namespace</span>
-     <li><span class="dfn-paneled" id="e5ea84f2">intersection</span>
+     <li><span class="dfn-paneled" id="75393c04">exist <small>(for list)</small></span>
+     <li><span class="dfn-paneled" id="1243a891">exist <small>(for map)</small></span>
+     <li><span class="dfn-paneled" id="16d07e10">for each</span>
+     <li><span class="dfn-paneled" id="f052b1ea">HTML namespace</span>
      <li><span class="dfn-paneled" id="f02cd417">iterate</span>
-     <li><span class="dfn-paneled" id="31db57e6">keys</span>
-     <li><span class="dfn-paneled" id="649608b9">list</span>
      <li><span class="dfn-paneled" id="84b454ff">ordered map</span>
      <li><span class="dfn-paneled" id="692595fe">ordered set</span>
      <li><span class="dfn-paneled" id="99c988d6">remove</span>
+     <li><span class="dfn-paneled" id="0204d188">size</span>
      <li><span class="dfn-paneled" id="0698d556">string</span>
-     <li><span class="dfn-paneled" id="5c7fa56b">subset</span>
      <li><span class="dfn-paneled" id="35feaa5b">superset</span>
-     <li><span class="dfn-paneled" id="85a289c7">svg namespace</span>
-     <li><span class="dfn-paneled" id="12d6b9a8">values</span>
-    </ul>
-   <li>
-    <a data-link-type="biblio">[SPEECH-API]</a> defines the following terms:
-    <ul>
-     <li><span class="dfn-paneled" id="d0c88c92">string</span>
+     <li><span class="dfn-paneled" id="85a289c7">SVG namespace</span>
     </ul>
    <li>
     <a data-link-type="biblio">[TRUSTED-TYPES]</a> defines the following terms:
@@ -1955,8 +1840,6 @@ <h3 class="no-num no-ref heading settled" id="normative"><span class="content">N
    <dd>Anne van Kesteren; et al. <a href="https://html.spec.whatwg.org/multipage/"><cite>HTML Standard</cite></a>. Living Standard. URL: <a href="https://html.spec.whatwg.org/multipage/">https://html.spec.whatwg.org/multipage/</a>
    <dt id="biblio-infra">[INFRA]
    <dd>Anne van Kesteren; Domenic Denicola. <a href="https://infra.spec.whatwg.org/"><cite>Infra Standard</cite></a>. Living Standard. URL: <a href="https://infra.spec.whatwg.org/">https://infra.spec.whatwg.org/</a>
-   <dt id="biblio-speech-api">[SPEECH-API]
-   <dd><a href="https://wicg.github.io/speech-api/"><cite>Web Speech API</cite></a>. cg-draft. URL: <a href="https://wicg.github.io/speech-api/">https://wicg.github.io/speech-api/</a>
    <dt id="biblio-trusted-types">[TRUSTED-TYPES]
    <dd>Krzysztof Kotowicz. <a href="https://w3c.github.io/trusted-types/dist/spec/"><cite>Trusted Types</cite></a>. URL: <a href="https://w3c.github.io/trusted-types/dist/spec/">https://w3c.github.io/trusted-types/dist/spec/</a>
    <dt id="biblio-urlpattern">[URLPATTERN]
@@ -1978,9 +1861,22 @@ <h2 class="no-num no-ref heading settled" id="idl-index"><span class="content">I
 
 [<a class="idl-code" data-link-type="extended-attribute" href="https://webidl.spec.whatwg.org/#Exposed"><c- g>Exposed</c-></a>=(<c- n>Window</c->,<c- n>Worker</c->)]
 <c- b>interface</c-> <a href="#sanitizer"><code><c- g>Sanitizer</c-></code></a> {
-  <a href="#dom-sanitizer-sanitizer"><code><c- g>constructor</c-></code></a>(<c- b>optional</c-> <a data-link-type="idl-name" href="#dictdef-sanitizerconfig"><c- n>SanitizerConfig</c-></a> <a href="#dom-sanitizer-sanitizer-config-config"><code><c- g>config</c-></code></a> = {});
+  <a href="#dom-sanitizer-sanitizer"><code><c- g>constructor</c-></code></a>(<c- b>optional</c-> <a data-link-type="idl-name" href="#dictdef-sanitizerconfig"><c- n>SanitizerConfig</c-></a> <a href="#dom-sanitizer-sanitizer-configuration-configuration"><code><c- g>configuration</c-></code></a> = {});
+
+  // Query configuration:
   <a data-link-type="idl-name" href="#dictdef-sanitizerconfig"><c- n>SanitizerConfig</c-></a> <a href="#dom-sanitizer-get"><code><c- g>get</c-></code></a>();
-  <a data-link-type="idl-name" href="#dictdef-sanitizerconfig"><c- n>SanitizerConfig</c-></a> <a href="#dom-sanitizer-getunsafe"><code><c- g>getUnsafe</c-></code></a>();
+
+  // Modify a Sanitizer’s lists and fields:
+  <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-undefined"><c- b>undefined</c-></a> <a href="#dom-sanitizer-allowelement"><code><c- g>allowElement</c-></code></a>(<a data-link-type="idl-name" href="#typedefdef-sanitizerelementwithattributes"><c- n>SanitizerElementWithAttributes</c-></a> <a href="#dom-sanitizer-allowelement-element-element"><code><c- g>element</c-></code></a>);
+  <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-undefined"><c- b>undefined</c-></a> <a href="#dom-sanitizer-removeelement"><code><c- g>removeElement</c-></code></a>(<a data-link-type="idl-name" href="#typedefdef-sanitizerelement"><c- n>SanitizerElement</c-></a> <a href="#dom-sanitizer-removeelement-element-element"><code><c- g>element</c-></code></a>);
+  <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-undefined"><c- b>undefined</c-></a> <a href="#dom-sanitizer-replaceelementwithchildren"><code><c- g>replaceElementWithChildren</c-></code></a>(<a data-link-type="idl-name" href="#typedefdef-sanitizerelement"><c- n>SanitizerElement</c-></a> <a href="#dom-sanitizer-replaceelementwithchildren-element-element"><code><c- g>element</c-></code></a>);
+  <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-undefined"><c- b>undefined</c-></a> <a href="#dom-sanitizer-allowattribute"><code><c- g>allowAttribute</c-></code></a>(<a data-link-type="idl-name" href="#typedefdef-sanitizerattribute"><c- n>SanitizerAttribute</c-></a> <a href="#dom-sanitizer-allowattribute-attribute-attribute"><code><c- g>attribute</c-></code></a>);
+  <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-undefined"><c- b>undefined</c-></a> <a href="#dom-sanitizer-removeattribute"><code><c- g>removeAttribute</c-></code></a>(<a data-link-type="idl-name" href="#typedefdef-sanitizerattribute"><c- n>SanitizerAttribute</c-></a> <a href="#dom-sanitizer-removeattribute-attribute-attribute"><code><c- g>attribute</c-></code></a>);
+  <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-undefined"><c- b>undefined</c-></a> <a href="#dom-sanitizer-setcomments"><code><c- g>setComments</c-></code></a>(<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-boolean"><c- b>boolean</c-></a> <a href="#dom-sanitizer-setcomments-allow-allow"><code><c- g>allow</c-></code></a>);
+  <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-undefined"><c- b>undefined</c-></a> <a href="#dom-sanitizer-setdataattributes"><code><c- g>setDataAttributes</c-></code></a>(<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-boolean"><c- b>boolean</c-></a> <a href="#dom-sanitizer-setdataattributes-allow-allow"><code><c- g>allow</c-></code></a>);
+
+  // Remove markup that executes script. May modify multiple lists:
+  <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-undefined"><c- b>undefined</c-></a> <a href="#dom-sanitizer-removeunsafe"><code><c- g>removeUnsafe</c-></code></a>();
 };
 
 <c- b>dictionary</c-> <a href="#dictdef-sanitizerelementnamespace"><code><c- g>SanitizerElementNamespace</c-></code></a> {
@@ -2016,6 +1912,12 @@ <h2 class="no-num no-ref heading settled" id="idl-index"><span class="content">I
 };
 
 </pre>
+  <h2 class="no-num no-ref heading settled" id="issues-index"><span class="content">Issues Index</span><a class="self-link" href="#issues-index"></a></h2>
+  <div style="counter-reset:issue">
+   <div class="issue"> This is still missing error checks for the per-element attribute lists
+    and syntax errors. <a class="issue-return" href="#issue-d2a3ab76" title="Jump to section">↵</a></div>
+   <div class="issue"> Determine if this actually holds. <a href="https://github.com/WICG/sanitizer-api/issues/233">[Issue #233]</a> <a class="issue-return" href="#issue-6d9aace7" title="Jump to section">↵</a></div>
+  </div>
 <script>/* Boilerplate: script-dom-helper */
 "use strict";
 function query(sel) { return document.querySelector(sel); }
@@ -2216,72 +2118,70 @@ <h2 class="no-num no-ref heading settled" id="idl-index"><span class="content">I
 "use strict";
 {
 let dfnPanelData = {
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+"1243a891": {"dfnID":"1243a891","dfnText":"exist (for map)","external":true,"refSections":[{"refs":[{"id":"ref-for-map-exists"}],"title":"3. Algorithms"},{"refs":[{"id":"ref-for-map-exists\u2460"},{"id":"ref-for-map-exists\u2461"},{"id":"ref-for-map-exists\u2462"},{"id":"ref-for-map-exists\u2463"}],"title":"3.2. Configuration Processing"}],"url":"https://infra.spec.whatwg.org/#map-exists"},
+"16d07e10": {"dfnID":"16d07e10","dfnText":"for each","external":true,"refSections":[{"refs":[{"id":"ref-for-list-iterate"}],"title":"3. Algorithms"},{"refs":[{"id":"ref-for-list-iterate\u2460"},{"id":"ref-for-list-iterate\u2461"}],"title":"3.1. Sanitization Algorithms"},{"refs":[{"id":"ref-for-list-iterate\u2462"},{"id":"ref-for-list-iterate\u2463"},{"id":"ref-for-list-iterate\u2464"},{"id":"ref-for-list-iterate\u2465"},{"id":"ref-for-list-iterate\u2466"},{"id":"ref-for-list-iterate\u2467"},{"id":"ref-for-list-iterate\u2468"},{"id":"ref-for-list-iterate\u2460\u24ea"},{"id":"ref-for-list-iterate\u2460\u2460"}],"title":"3.2. Configuration Processing"}],"url":"https://infra.spec.whatwg.org/#list-iterate"},
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+"sanitizer-remove-an-attribute": {"dfnID":"sanitizer-remove-an-attribute","dfnText":"remove an attribute","external":false,"refSections":[{"refs":[{"id":"ref-for-sanitizer-remove-an-attribute"}],"title":"2.2. SetHTML options and the configuration object."},{"refs":[{"id":"ref-for-sanitizer-remove-an-attribute\u2460"},{"id":"ref-for-sanitizer-remove-an-attribute\u2461"}],"title":"3.2. Configuration Processing"}],"url":"#sanitizer-remove-an-attribute"},
+"sanitizer-remove-an-element": {"dfnID":"sanitizer-remove-an-element","dfnText":"remove an element","external":false,"refSections":[{"refs":[{"id":"ref-for-sanitizer-remove-an-element"}],"title":"2.2. SetHTML options and the configuration object."},{"refs":[{"id":"ref-for-sanitizer-remove-an-element\u2460"},{"id":"ref-for-sanitizer-remove-an-element\u2461"}],"title":"3.2. Configuration Processing"}],"url":"#sanitizer-remove-an-element"},
+"sanitizer-removeattribute": {"dfnID":"sanitizer-removeattribute","dfnText":"removeAttribute","external":false,"refSections":[],"url":"#sanitizer-removeattribute"},
+"sanitizer-removeelement": {"dfnID":"sanitizer-removeelement","dfnText":"removeElement","external":false,"refSections":[],"url":"#sanitizer-removeelement"},
+"sanitizer-removeunsafe": {"dfnID":"sanitizer-removeunsafe","dfnText":"removeUnsafe","external":false,"refSections":[],"url":"#sanitizer-removeunsafe"},
+"sanitizer-replace-an-element-with-its-children": {"dfnID":"sanitizer-replace-an-element-with-its-children","dfnText":"replace an element with its children","external":false,"refSections":[{"refs":[{"id":"ref-for-sanitizer-replace-an-element-with-its-children"}],"title":"2.2. SetHTML options and the configuration object."},{"refs":[{"id":"ref-for-sanitizer-replace-an-element-with-its-children\u2460"}],"title":"3.2. Configuration Processing"}],"url":"#sanitizer-replace-an-element-with-its-children"},
+"sanitizer-replaceelementwithchildren": {"dfnID":"sanitizer-replaceelementwithchildren","dfnText":"replaceElementWithChildren","external":false,"refSections":[],"url":"#sanitizer-replaceelementwithchildren"},
+"sanitizer-set-a-configuration": {"dfnID":"sanitizer-set-a-configuration","dfnText":"set a configuration","external":false,"refSections":[{"refs":[{"id":"ref-for-sanitizer-set-a-configuration"}],"title":"2.2. SetHTML options and the configuration object."},{"refs":[{"id":"ref-for-sanitizer-set-a-configuration\u2460"},{"id":"ref-for-sanitizer-set-a-configuration\u2461"},{"id":"ref-for-sanitizer-set-a-configuration\u2462"}],"title":"3. Algorithms"}],"url":"#sanitizer-set-a-configuration"},
+"sanitizer-set-comments": {"dfnID":"sanitizer-set-comments","dfnText":"set comments","external":false,"refSections":[{"refs":[{"id":"ref-for-sanitizer-set-comments"}],"title":"2.2. SetHTML options and the configuration object."},{"refs":[{"id":"ref-for-sanitizer-set-comments\u2460"}],"title":"3.2. Configuration Processing"}],"url":"#sanitizer-set-comments"},
+"sanitizer-set-data-attributes": {"dfnID":"sanitizer-set-data-attributes","dfnText":"set data attributes","external":false,"refSections":[{"refs":[{"id":"ref-for-sanitizer-set-data-attributes"}],"title":"2.2. SetHTML options and the configuration object."},{"refs":[{"id":"ref-for-sanitizer-set-data-attributes\u2460"}],"title":"3.2. Configuration Processing"}],"url":"#sanitizer-set-data-attributes"},
+"sanitizer-setcomments": {"dfnID":"sanitizer-setcomments","dfnText":"setComments","external":false,"refSections":[],"url":"#sanitizer-setcomments"},
+"sanitizer-setdataattributes": {"dfnID":"sanitizer-setdataattributes","dfnText":"setDataAttributes","external":false,"refSections":[],"url":"#sanitizer-setdataattributes"},
+"sanitizerconfig-add": {"dfnID":"sanitizerconfig-add","dfnText":"add","external":false,"refSections":[{"refs":[{"id":"ref-for-sanitizerconfig-add"},{"id":"ref-for-sanitizerconfig-add\u2460"},{"id":"ref-for-sanitizerconfig-add\u2461"},{"id":"ref-for-sanitizerconfig-add\u2462"},{"id":"ref-for-sanitizerconfig-add\u2463"},{"id":"ref-for-sanitizerconfig-add\u2464"}],"title":"3.2. Configuration Processing"}],"url":"#sanitizerconfig-add"},
+"sanitizerconfig-allow-an-element": {"dfnID":"sanitizerconfig-allow-an-element","dfnText":"allow an element","external":false,"refSections":[{"refs":[{"id":"ref-for-sanitizerconfig-allow-an-element"}],"title":"2.2. SetHTML options and the configuration object."},{"refs":[{"id":"ref-for-sanitizerconfig-allow-an-element\u2460"}],"title":"3.2. Configuration Processing"}],"url":"#sanitizerconfig-allow-an-element"},
+"sanitizerconfig-contains": {"dfnID":"sanitizerconfig-contains","dfnText":"contains","external":false,"refSections":[{"refs":[{"id":"ref-for-sanitizerconfig-contains"},{"id":"ref-for-sanitizerconfig-contains\u2460"},{"id":"ref-for-sanitizerconfig-contains\u2461"},{"id":"ref-for-sanitizerconfig-contains\u2462"},{"id":"ref-for-sanitizerconfig-contains\u2463"},{"id":"ref-for-sanitizerconfig-contains\u2464"},{"id":"ref-for-sanitizerconfig-contains\u2465"}],"title":"3.1. Sanitization Algorithms"},{"refs":[{"id":"ref-for-sanitizerconfig-contains\u2466"}],"title":"3.3. Supporting Algorithms"}],"url":"#sanitizerconfig-contains"},
+"sanitizerconfig-get-a-sanitizer-instance-from-options": {"dfnID":"sanitizerconfig-get-a-sanitizer-instance-from-options","dfnText":"get a sanitizer instance from options","external":false,"refSections":[{"refs":[{"id":"ref-for-sanitizerconfig-get-a-sanitizer-instance-from-options"},{"id":"ref-for-sanitizerconfig-get-a-sanitizer-instance-from-options\u2460"}],"title":"2.1. Sanitizer API"},{"refs":[{"id":"ref-for-sanitizerconfig-get-a-sanitizer-instance-from-options\u2461"}],"title":"3. Algorithms"}],"url":"#sanitizerconfig-get-a-sanitizer-instance-from-options"},
+"sanitizerconfig-remove": {"dfnID":"sanitizerconfig-remove","dfnText":"remove","external":false,"refSections":[{"refs":[{"id":"ref-for-sanitizerconfig-remove"},{"id":"ref-for-sanitizerconfig-remove\u2460"},{"id":"ref-for-sanitizerconfig-remove\u2461"},{"id":"ref-for-sanitizerconfig-remove\u2462"},{"id":"ref-for-sanitizerconfig-remove\u2463"},{"id":"ref-for-sanitizerconfig-remove\u2464"},{"id":"ref-for-sanitizerconfig-remove\u2465"},{"id":"ref-for-sanitizerconfig-remove\u2466"},{"id":"ref-for-sanitizerconfig-remove\u2467"},{"id":"ref-for-sanitizerconfig-remove\u2468"}],"title":"3.2. Configuration Processing"}],"url":"#sanitizerconfig-remove"},
+"sanitizerconfig-remove-unsafe": {"dfnID":"sanitizerconfig-remove-unsafe","dfnText":"remove unsafe","external":false,"refSections":[{"refs":[{"id":"ref-for-sanitizerconfig-remove-unsafe"}],"title":"2.2. SetHTML options and the configuration object."},{"refs":[{"id":"ref-for-sanitizerconfig-remove-unsafe\u2460"}],"title":"3.1. Sanitization Algorithms"},{"refs":[{"id":"ref-for-sanitizerconfig-remove-unsafe\u2461"}],"title":"3.2. Configuration Processing"}],"url":"#sanitizerconfig-remove-unsafe"},
 "set-and-filter-html": {"dfnID":"set-and-filter-html","dfnText":"set and filter HTML","external":false,"refSections":[{"refs":[{"id":"ref-for-set-and-filter-html"},{"id":"ref-for-set-and-filter-html\u2460"},{"id":"ref-for-set-and-filter-html\u2461"},{"id":"ref-for-set-and-filter-html\u2462"}],"title":"2.1. Sanitizer API"}],"url":"#set-and-filter-html"},
-"set-difference": {"dfnID":"set-difference","dfnText":"difference","external":false,"refSections":[{"refs":[{"id":"ref-for-set-difference"},{"id":"ref-for-set-difference\u2460"},{"id":"ref-for-set-difference\u2461"},{"id":"ref-for-set-difference\u2462"},{"id":"ref-for-set-difference\u2463"},{"id":"ref-for-set-difference\u2464"},{"id":"ref-for-set-difference\u2465"}],"title":"3.2. Configuration Processing"}],"url":"#set-difference"},
-"set-equal": {"dfnID":"set-equal","dfnText":"equal","external":false,"refSections":[{"refs":[{"id":"ref-for-set-equal"}],"title":"3.1. Sanitization Algorithms"},{"refs":[{"id":"ref-for-set-equal\u2460"},{"id":"ref-for-set-equal\u2461"}],"title":"3.2. Configuration Processing"},{"refs":[{"id":"ref-for-set-equal\u2462"},{"id":"ref-for-set-equal\u2463"}],"title":"3.3. Supporting Algorithms"}],"url":"#set-equal"},
+"set-equal": {"dfnID":"set-equal","dfnText":"equal","external":false,"refSections":[{"refs":[{"id":"ref-for-set-equal"}],"title":"3.1. Sanitization Algorithms"},{"refs":[{"id":"ref-for-set-equal\u2460"},{"id":"ref-for-set-equal\u2461"},{"id":"ref-for-set-equal\u2462"},{"id":"ref-for-set-equal\u2463"}],"title":"3.3. Supporting Algorithms"}],"url":"#set-equal"},
 "shadowroot-sethtml": {"dfnID":"shadowroot-sethtml","dfnText":"setHTML","external":false,"refSections":[],"url":"#shadowroot-sethtml"},
 "shadowroot-sethtmlunsafe": {"dfnID":"shadowroot-sethtmlunsafe","dfnText":"setHTMLUnsafe","external":false,"refSections":[],"url":"#shadowroot-sethtmlunsafe"},
-"typedefdef-sanitizerattribute": {"dfnID":"typedefdef-sanitizerattribute","dfnText":"SanitizerAttribute","external":false,"refSections":[{"refs":[{"id":"ref-for-typedefdef-sanitizerattribute"},{"id":"ref-for-typedefdef-sanitizerattribute\u2460"},{"id":"ref-for-typedefdef-sanitizerattribute\u2461"},{"id":"ref-for-typedefdef-sanitizerattribute\u2462"}],"title":"2.3. The Configuration Dictionary"}],"url":"#typedefdef-sanitizerattribute"},
-"typedefdef-sanitizerelement": {"dfnID":"typedefdef-sanitizerelement","dfnText":"SanitizerElement","external":false,"refSections":[{"refs":[{"id":"ref-for-typedefdef-sanitizerelement"},{"id":"ref-for-typedefdef-sanitizerelement\u2460"}],"title":"2.3. The Configuration Dictionary"}],"url":"#typedefdef-sanitizerelement"},
-"typedefdef-sanitizerelementwithattributes": {"dfnID":"typedefdef-sanitizerelementwithattributes","dfnText":"SanitizerElementWithAttributes","external":false,"refSections":[{"refs":[{"id":"ref-for-typedefdef-sanitizerelementwithattributes"}],"title":"2.3. The Configuration Dictionary"}],"url":"#typedefdef-sanitizerelementwithattributes"},
+"typedefdef-sanitizerattribute": {"dfnID":"typedefdef-sanitizerattribute","dfnText":"SanitizerAttribute","external":false,"refSections":[{"refs":[{"id":"ref-for-typedefdef-sanitizerattribute"},{"id":"ref-for-typedefdef-sanitizerattribute\u2460"}],"title":"2.2. SetHTML options and the configuration object."},{"refs":[{"id":"ref-for-typedefdef-sanitizerattribute\u2461"},{"id":"ref-for-typedefdef-sanitizerattribute\u2462"},{"id":"ref-for-typedefdef-sanitizerattribute\u2463"},{"id":"ref-for-typedefdef-sanitizerattribute\u2464"}],"title":"2.3. The Configuration Dictionary"},{"refs":[{"id":"ref-for-typedefdef-sanitizerattribute\u2465"}],"title":"3.2. Configuration Processing"}],"url":"#typedefdef-sanitizerattribute"},
+"typedefdef-sanitizerelement": {"dfnID":"typedefdef-sanitizerelement","dfnText":"SanitizerElement","external":false,"refSections":[{"refs":[{"id":"ref-for-typedefdef-sanitizerelement"},{"id":"ref-for-typedefdef-sanitizerelement\u2460"}],"title":"2.2. SetHTML options and the configuration object."},{"refs":[{"id":"ref-for-typedefdef-sanitizerelement\u2461"},{"id":"ref-for-typedefdef-sanitizerelement\u2462"}],"title":"2.3. The Configuration Dictionary"},{"refs":[{"id":"ref-for-typedefdef-sanitizerelement\u2463"}],"title":"3.2. Configuration Processing"}],"url":"#typedefdef-sanitizerelement"},
+"typedefdef-sanitizerelementwithattributes": {"dfnID":"typedefdef-sanitizerelementwithattributes","dfnText":"SanitizerElementWithAttributes","external":false,"refSections":[{"refs":[{"id":"ref-for-typedefdef-sanitizerelementwithattributes"}],"title":"2.2. SetHTML options and the configuration object."},{"refs":[{"id":"ref-for-typedefdef-sanitizerelementwithattributes\u2460"}],"title":"2.3. The Configuration Dictionary"},{"refs":[{"id":"ref-for-typedefdef-sanitizerelementwithattributes\u2461"}],"title":"3.2. Configuration Processing"}],"url":"#typedefdef-sanitizerelementwithattributes"},
 };
 
 document.addEventListener("DOMContentLoaded", ()=>{
@@ -2745,125 +2672,130 @@ <h2 class="no-num no-ref heading settled" id="idl-index"><span class="content">I
 "use strict";
 {
 let refsData = {
-"#built-in-default-config": {"export":true,"for_":[],"level":"1","normative":true,"shortname":"sanitizer-api","spec":"sanitizer-api-1","status":"local","text":"built-in default config","type":"dfn","url":"#built-in-default-config"},
-"#canonicalize-a-configuration": {"export":true,"for_":[],"level":"1","normative":true,"shortname":"sanitizer-api","spec":"sanitizer-api-1","status":"local","text":"canonicalize a configuration","type":"dfn","url":"#canonicalize-a-configuration"},
-"#canonicalize-a-sanitizer-element-list": {"export":true,"for_":[],"level":"1","normative":true,"shortname":"sanitizer-api","spec":"sanitizer-api-1","status":"local","text":"canonicalize a sanitizer element list","type":"dfn","url":"#canonicalize-a-sanitizer-element-list"},
-"#canonicalize-a-sanitizer-name": {"export":true,"for_":[],"level":"1","normative":true,"shortname":"sanitizer-api","spec":"sanitizer-api-1","status":"local","text":"canonicalize a sanitizer name","type":"dfn","url":"#canonicalize-a-sanitizer-name"},
-"#dictdef-sanitizerattributenamespace": {"export":true,"for_":[],"level":"1","normative":true,"shortname":"sanitizer-api","spec":"sanitizer-api-1","status":"local","text":"SanitizerAttributeNamespace","type":"dictionary","url":"#dictdef-sanitizerattributenamespace"},
-"#dictdef-sanitizerconfig": {"export":true,"for_":[],"level":"1","normative":true,"shortname":"sanitizer-api","spec":"sanitizer-api-1","status":"local","text":"SanitizerConfig","type":"dictionary","url":"#dictdef-sanitizerconfig"},
-"#dictdef-sanitizerelementnamespace": {"export":true,"for_":[],"level":"1","normative":true,"shortname":"sanitizer-api","spec":"sanitizer-api-1","status":"local","text":"SanitizerElementNamespace","type":"dictionary","url":"#dictdef-sanitizerelementnamespace"},
-"#dictdef-sanitizerelementnamespacewithattributes": {"export":true,"for_":[],"level":"1","normative":true,"shortname":"sanitizer-api","spec":"sanitizer-api-1","status":"local","text":"SanitizerElementNamespaceWithAttributes","type":"dictionary","url":"#dictdef-sanitizerelementnamespacewithattributes"},
-"#dictdef-sethtmloptions": {"export":true,"for_":[],"level":"1","normative":true,"shortname":"sanitizer-api","spec":"sanitizer-api-1","status":"local","text":"SetHTMLOptions","type":"dictionary","url":"#dictdef-sethtmloptions"},
-"#dom-element-sethtml": {"export":true,"for_":["Element"],"level":"1","normative":true,"shortname":"sanitizer-api","spec":"sanitizer-api-1","status":"local","text":"setHTML(html)","type":"method","url":"#dom-element-sethtml"},
-"#dom-element-sethtmlunsafe": {"export":true,"for_":["Element"],"level":"1","normative":true,"shortname":"sanitizer-api","spec":"sanitizer-api-1","status":"local","text":"setHTMLUnsafe(html)","type":"method","url":"#dom-element-sethtmlunsafe"},
-"#dom-sanitizerconfig-attributes": {"export":true,"for_":["SanitizerConfig"],"level":"1","normative":true,"shortname":"sanitizer-api","spec":"sanitizer-api-1","status":"local","text":"attributes","type":"dict-member","url":"#dom-sanitizerconfig-attributes"},
-"#dom-sanitizerconfig-comments": {"export":true,"for_":["SanitizerConfig"],"level":"1","normative":true,"shortname":"sanitizer-api","spec":"sanitizer-api-1","status":"local","text":"comments","type":"dict-member","url":"#dom-sanitizerconfig-comments"},
-"#dom-sanitizerconfig-dataattributes": {"export":true,"for_":["SanitizerConfig"],"level":"1","normative":true,"shortname":"sanitizer-api","spec":"sanitizer-api-1","status":"local","text":"dataAttributes","type":"dict-member","url":"#dom-sanitizerconfig-dataattributes"},
-"#dom-sanitizerconfig-elements": {"export":true,"for_":["SanitizerConfig"],"level":"1","normative":true,"shortname":"sanitizer-api","spec":"sanitizer-api-1","status":"local","text":"elements","type":"dict-member","url":"#dom-sanitizerconfig-elements"},
-"#dom-sanitizerconfig-removeattributes": {"export":true,"for_":["SanitizerConfig"],"level":"1","normative":true,"shortname":"sanitizer-api","spec":"sanitizer-api-1","status":"local","text":"removeAttributes","type":"dict-member","url":"#dom-sanitizerconfig-removeattributes"},
-"#dom-sanitizerconfig-removeelements": {"export":true,"for_":["SanitizerConfig"],"level":"1","normative":true,"shortname":"sanitizer-api","spec":"sanitizer-api-1","status":"local","text":"removeElements","type":"dict-member","url":"#dom-sanitizerconfig-removeelements"},
-"#dom-sanitizerconfig-replacewithchildrenelements": {"export":true,"for_":["SanitizerConfig"],"level":"1","normative":true,"shortname":"sanitizer-api","spec":"sanitizer-api-1","status":"local","text":"replaceWithChildrenElements","type":"dict-member","url":"#dom-sanitizerconfig-replacewithchildrenelements"},
-"#dom-sanitizerelementnamespace-name": {"export":true,"for_":["SanitizerElementNamespace"],"level":"1","normative":true,"shortname":"sanitizer-api","spec":"sanitizer-api-1","status":"local","text":"name","type":"dict-member","url":"#dom-sanitizerelementnamespace-name"},
-"#dom-sanitizerelementnamespace-namespace": {"export":true,"for_":["SanitizerElementNamespace"],"level":"1","normative":true,"shortname":"sanitizer-api","spec":"sanitizer-api-1","status":"local","text":"namespace","type":"dict-member","url":"#dom-sanitizerelementnamespace-namespace"},
-"#dom-sanitizerelementnamespacewithattributes-attributes": {"export":true,"for_":["SanitizerElementNamespaceWithAttributes"],"level":"1","normative":true,"shortname":"sanitizer-api","spec":"sanitizer-api-1","status":"local","text":"attributes","type":"dict-member","url":"#dom-sanitizerelementnamespacewithattributes-attributes"},
-"#dom-sanitizerelementnamespacewithattributes-removeattributes": {"export":true,"for_":["SanitizerElementNamespaceWithAttributes"],"level":"1","normative":true,"shortname":"sanitizer-api","spec":"sanitizer-api-1","status":"local","text":"removeAttributes","type":"dict-member","url":"#dom-sanitizerelementnamespacewithattributes-removeattributes"},
-"#known-attributes": {"export":true,"for_":[],"level":"1","normative":true,"shortname":"sanitizer-api","spec":"sanitizer-api-1","status":"local","text":"known attributes","type":"dfn","url":"#known-attributes"},
-"#known-elements": {"export":true,"for_":[],"level":"1","normative":true,"shortname":"sanitizer-api","spec":"sanitizer-api-1","status":"local","text":"known elements","type":"dfn","url":"#known-elements"},
-"#navigating-url-attributes-list": {"export":true,"for_":[],"level":"1","normative":true,"shortname":"sanitizer-api","spec":"sanitizer-api-1","status":"local","text":"navigating url attributes list","type":"dfn","url":"#navigating-url-attributes-list"},
-"#sanitize": {"export":true,"for_":[],"level":"1","normative":true,"shortname":"sanitizer-api","spec":"sanitizer-api-1","status":"local","text":"sanitize","type":"dfn","url":"#sanitize"},
-"#sanitizer": {"export":true,"for_":[],"level":"1","normative":true,"shortname":"sanitizer-api","spec":"sanitizer-api-1","status":"local","text":"Sanitizer","type":"interface","url":"#sanitizer"},
-"#sanitizerconfig-canonical": {"export":true,"for_":["SanitizerConfig"],"level":"1","normative":true,"shortname":"sanitizer-api","spec":"sanitizer-api-1","status":"local","text":"canonical","type":"dfn","url":"#sanitizerconfig-canonical"},
-"#sanitizerconfig-contains": {"export":true,"for_":["SanitizerConfig"],"level":"1","normative":true,"shortname":"sanitizer-api","spec":"sanitizer-api-1","status":"local","text":"contains","type":"dfn","url":"#sanitizerconfig-contains"},
-"#sanitizerconfig-get-a-sanitizer-config-from-options": {"export":true,"for_":["SanitizerConfig"],"level":"1","normative":true,"shortname":"sanitizer-api","spec":"sanitizer-api-1","status":"local","text":"get a sanitizer config from options","type":"dfn","url":"#sanitizerconfig-get-a-sanitizer-config-from-options"},
-"#sanitizerconfig-valid": {"export":true,"for_":["SanitizerConfig"],"level":"1","normative":true,"shortname":"sanitizer-api","spec":"sanitizer-api-1","status":"local","text":"valid","type":"dfn","url":"#sanitizerconfig-valid"},
-"#sanitizernamelist-canonical": {"export":true,"for_":["SanitizerNameList"],"level":"1","normative":true,"shortname":"sanitizer-api","spec":"sanitizer-api-1","status":"local","text":"canonical","type":"dfn","url":"#sanitizernamelist-canonical"},
-"#sanitizernamelist-valid": {"export":true,"for_":["SanitizerNameList"],"level":"1","normative":true,"shortname":"sanitizer-api","spec":"sanitizer-api-1","status":"local","text":"valid","type":"dfn","url":"#sanitizernamelist-valid"},
-"#sanitizernamewithattributeslist-canonical": {"export":true,"for_":["SanitizerNameWithAttributesList"],"level":"1","normative":true,"shortname":"sanitizer-api","spec":"sanitizer-api-1","status":"local","text":"canonical","type":"dfn","url":"#sanitizernamewithattributeslist-canonical"},
-"#set-and-filter-html": {"export":true,"for_":[],"level":"1","normative":true,"shortname":"sanitizer-api","spec":"sanitizer-api-1","status":"local","text":"set and filter html","type":"dfn","url":"#set-and-filter-html"},
-"#set-difference": {"export":true,"for_":["set"],"level":"1","normative":true,"shortname":"sanitizer-api","spec":"sanitizer-api-1","status":"local","text":"difference","type":"dfn","url":"#set-difference"},
-"#set-equal": {"export":true,"for_":["set"],"level":"1","normative":true,"shortname":"sanitizer-api","spec":"sanitizer-api-1","status":"local","text":"equal","type":"dfn","url":"#set-equal"},
-"#typedefdef-sanitizerattribute": {"export":true,"for_":[],"level":"1","normative":true,"shortname":"sanitizer-api","spec":"sanitizer-api-1","status":"local","text":"SanitizerAttribute","type":"typedef","url":"#typedefdef-sanitizerattribute"},
-"#typedefdef-sanitizerelement": {"export":true,"for_":[],"level":"1","normative":true,"shortname":"sanitizer-api","spec":"sanitizer-api-1","status":"local","text":"SanitizerElement","type":"typedef","url":"#typedefdef-sanitizerelement"},
-"#typedefdef-sanitizerelementwithattributes": {"export":true,"for_":[],"level":"1","normative":true,"shortname":"sanitizer-api","spec":"sanitizer-api-1","status":"local","text":"SanitizerElementWithAttributes","type":"typedef","url":"#typedefdef-sanitizerelementwithattributes"},
-"https://dom.spec.whatwg.org/#comment": {"export":true,"for_":[],"level":"1","normative":true,"shortname":"dom","spec":"dom","status":"current","text":"Comment","type":"interface","url":"https://dom.spec.whatwg.org/#comment"},
-"https://dom.spec.whatwg.org/#concept-attribute-local-name": {"export":true,"for_":["Attr"],"level":"1","normative":true,"shortname":"dom","spec":"dom","status":"current","text":"local name","type":"dfn","url":"https://dom.spec.whatwg.org/#concept-attribute-local-name"},
-"https://dom.spec.whatwg.org/#concept-attribute-namespace": {"export":true,"for_":["Attr"],"level":"1","normative":true,"shortname":"dom","spec":"dom","status":"current","text":"namespace","type":"dfn","url":"https://dom.spec.whatwg.org/#concept-attribute-namespace"},
-"https://dom.spec.whatwg.org/#concept-document-content-type": {"export":true,"for_":["Document"],"level":"1","normative":true,"shortname":"dom","spec":"dom","status":"current","text":"content type","type":"dfn","url":"https://dom.spec.whatwg.org/#concept-document-content-type"},
-"https://dom.spec.whatwg.org/#concept-element-attribute": {"export":true,"for_":["Element"],"level":"1","normative":true,"shortname":"dom","spec":"dom","status":"current","text":"attribute list","type":"dfn","url":"https://dom.spec.whatwg.org/#concept-element-attribute"},
-"https://dom.spec.whatwg.org/#concept-element-local-name": {"export":true,"for_":["Element"],"level":"1","normative":true,"shortname":"dom","spec":"dom","status":"current","text":"local name","type":"dfn","url":"https://dom.spec.whatwg.org/#concept-element-local-name"},
-"https://dom.spec.whatwg.org/#concept-element-namespace": {"export":true,"for_":["Element"],"level":"1","normative":true,"shortname":"dom","spec":"dom","status":"current","text":"namespace","type":"dfn","url":"https://dom.spec.whatwg.org/#concept-element-namespace"},
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