diff --git a/demo/Menu.tsx b/demo/Menu.tsx
new file mode 100644
index 00000000..2c719d5d
--- /dev/null
+++ b/demo/Menu.tsx
@@ -0,0 +1,73 @@
+import { toggleMark } from "prosemirror-commands";
+import type { MarkType } from "prosemirror-model";
+import type { EditorState } from "prosemirror-state";
+import React, { ReactNode } from "react";
+
+import { useEditorEventCallback, useEditorState } from "../src/index.js";
+
+// lifted from:
+// https://github.com/ProseMirror/prosemirror-example-setup/blob/master/src/menu.ts#L58
+function isMarkActive(mark: MarkType, state: EditorState): boolean {
+  const { from, $from, to, empty } = state.selection;
+  return empty
+    ? !!mark.isInSet(state.storedMarks || $from.marks())
+    : state.doc.rangeHasMark(from, to, mark);
+}
+
+export function Button(props: {
+  className?: string;
+  children?: ReactNode;
+  isActive: boolean;
+  title: string;
+  onClick: () => void;
+}) {
+  return (
+    <button
+      type="button"
+      title={props.title}
+      aria-pressed={props.isActive}
+      className={`button ${props.className}`}
+      onClick={props.onClick}
+    >
+      <span className="visually-hidden">{props.title}</span>
+      <span aria-hidden>{props.children}</span>
+    </button>
+  );
+}
+
+export default function Menu() {
+  const state = useEditorState();
+
+  const toggleBold = useEditorEventCallback((view) => {
+    if (!view) return;
+    const toggleBoldMark = toggleMark(view.state.schema.marks["strong"]);
+    toggleBoldMark(view.state, view.dispatch, view);
+  });
+
+  const toggleItalic = useEditorEventCallback((view) => {
+    if (!view) return;
+    const toggleItalicMark = toggleMark(view.state.schema.marks["em"]);
+    toggleItalicMark(view.state, view.dispatch, view);
+  });
+
+  return (
+    <div className="menu">
+      <Button
+        className="bold"
+        title="Bold (⌘b)"
+        isActive={!!state && isMarkActive(state.schema.marks["strong"], state)}
+        onClick={toggleBold}
+      >
+        B
+      </Button>
+      <Button
+        className="italic"
+        title="Italic (⌘i)"
+        isActive={!!state && isMarkActive(state.schema.marks["em"], state)}
+        onClick={toggleItalic}
+      >
+        I
+      </Button>
+    </div>
+  );
+}
diff --git a/demo/main.css b/demo/main.css
index f419ecc3..fc18c35e 100644
--- a/demo/main.css
+++ b/demo/main.css
@@ -1,5 +1,5 @@
 .ProseMirror {
-  border: thin solid black;
+  border: thin solid #ccc;
   border-radius: 0.25rem;
   padding: 1rem;
   outline: none;
@@ -11,3 +11,46 @@ main {
   width: 80%;
   max-width: 700px;
 }
+
+.menu {
+  display: flex;
+  margin-bottom: 5px;
+}
+
+.button {
+  cursor: pointer;
+  width: 36px;
+  height: 36px;
+  margin-right: 5px;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  box-shadow: none;
+  border: thin solid #ccc;
+  border-radius: 0.25rem;
+  color: black;
+  background-color: white;
+
+  &[aria-pressed="true"] {
+    background-color: #ddd;
+    color: blue;
+  }
+}
+
+.button.bold {
+  font-weight: 700;
+}
+
+.button.italic {
+  font-style: italic;
+}
+
+.visually-hidden {
+  clip: rect(0 0 0 0);
+  clip-path: inset(50%);
+  height: 1px;
+  overflow: hidden;
+  position: absolute;
+  white-space: nowrap;
+  width: 1px;
+}
diff --git a/demo/main.tsx b/demo/main.tsx
index 10d94ad9..34ff93c1 100644
--- a/demo/main.tsx
+++ b/demo/main.tsx
@@ -5,6 +5,7 @@ import {
   liftEmptyBlock,
   newlineInCode,
   splitBlock,
+  toggleMark,
 } from "prosemirror-commands";
 import { keymap } from "prosemirror-keymap";
 import { Schema } from "prosemirror-model";
@@ -22,6 +23,7 @@ import {
 import { ReactNodeViewConstructor } from "../src/nodeViews/createReactNodeViewConstructor.js";
 import { react } from "../src/plugins/react.js";
 
+import Menu from "./Menu.js";
 import "./main.css";
 
 const schema = new Schema({
@@ -32,6 +34,20 @@ const schema = new Schema({
     list_item: { content: "paragraph+", toDOM: () => ["li", 0] },
     text: { group: "inline" },
   },
+  marks: {
+    em: {
+      parseDOM: [{ tag: "em" }],
+      toDOM() {
+        return ["em", 0];
+      },
+    },
+    strong: {
+      parseDOM: [{ tag: "strong" }],
+      toDOM() {
+        return ["strong", 0];
+      },
+    },
+  },
 });
 
 const editorState = EditorState.create({
@@ -54,6 +70,8 @@ const editorState = EditorState.create({
       ),
       "Shift-Enter": baseKeymap.Enter,
       "Shift-Tab": liftListItem(schema.nodes.list_item),
+      "Mod-b": toggleMark(schema.marks["strong"]),
+      "Mod-i": toggleMark(schema.marks["em"]),
     }),
     react(),
   ],
@@ -101,13 +119,13 @@ function DemoEditor() {
 
   return (
     <main>
-      <h1>React ProseMirror Demo</h1>
       <ProseMirror
         mount={mount}
         state={state}
         nodeViews={nodeViews}
         dispatchTransaction={dispatchTransaction}
       >
+        <Menu />
         <div ref={setMount} />
         {renderNodeViews()}
       </ProseMirror>