chromium/src/third_party/blink/web_tests/fast/mediastream/resources/MediaDevices-enumerateDevices-iframe-child.html - manifest_repos/chromium_src - Git at Google

 <script>
   navigator.mediaDevices.enumerateDevices().then(devices => {
     window.parent.postMessage(JSON.stringify(devices), "*");
   });
 </script>
	<script>
	navigator.mediaDevices.enumerateDevices().then(devices => {
	window.parent.postMessage(JSON.stringify(devices), "*");
	});
	</script>