diff --git a/index.html b/index.html
index 333669f..fb74c15 100644
--- a/index.html
+++ b/index.html
@@ -10,7 +10,6 @@
 
     <meta name="viewport" content="width=device-width">
 
-    <script async type="module" src="./src/js/index.ts"></script>
     <link rel="stylesheet" href="./dist/index.css" />
   </head>
   <body>
@@ -19,6 +18,7 @@
       <textarea id="input" placeholder="Write some text here!"></textarea>
     </div>
 
-    <button>Fullscreen!</button>
+    <button invoketarget="input" invokeaction="toggleFullScreen">Fullscreen!</button>
+    <script async type="module" src="./src/js/index.ts"></script>
   </body>
 </html>
diff --git a/src/js/index.ts b/src/js/index.ts
index 25b4a21..41edca9 100644
--- a/src/js/index.ts
+++ b/src/js/index.ts
@@ -1,19 +1,10 @@
-function ready(): Promise<void> {
-  return new Promise(resolve => {
-    if (document.readyState === 'complete' || document.readyState === 'interactive') {
-      resolve()
-    } else {
-      document.addEventListener('DOMContentLoaded', () => resolve())
-    }
-  })
-}
-
-await ready()
 const fullScreenButton = document.querySelector('button')
 const input = document.querySelector('textarea')
-fullScreenButton?.addEventListener('click', async () => {
-  await input?.requestFullscreen()
-  input?.focus()
-})
+if (!fullScreenButton.invokeTargetElement) {
+  fullScreenButton?.addEventListener('click', async () => {
+    await input?.requestFullscreen()
+    input?.focus()
+  })
+}
 
 export {}
