chromium/src/third_party/blink/web_tests/http/tests/media/autoplay/resources/webaudio-iframe-with-gesture.html - manifest_repos/chromium_src - Git at Google

 <!DOCTYPE html>
 <html>
 <style>
 html, body { width: 100%; height: 100%; }
 </style>
 <body>
 <script>
 document.body.addEventListener('click', () => {
   let result = 'failed';

   try {
     const ac = new AudioContext();
     result = ac.state;
   } catch (e) {
     result = 'creation_failed';
   }

   top.postMessage(result, '*');
 }, { once: true });
 </script>
	<!DOCTYPE html>
	<html>
	<style>
	html, body { width: 100%; height: 100%; }
	</style>
	<body>
	<script>
	document.body.addEventListener('click', () => {
	let result = 'failed';

	try {
	const ac = new AudioContext();
	result = ac.state;
	} catch (e) {
	result = 'creation_failed';
	}

	top.postMessage(result, '*');
	}, { once: true });
	</script>