blink/web_tests/external/wpt/keyboard-map/resources/iframe-keyboard-map-helper.html - chromium/src/third_party - Git at Google

 <!DOCTYPE html>
 <script>
 'use strict';

 window.onmessage = message => {
   if (message.data === 'Ready') {
     let onSuccess = () => { parent.postMessage('Failure', '*'); };
     let onError = error => {
       if (error.name == 'InvalidStateError') {
         parent.postMessage('Success', '*');
       } else {
         parent.postMessage('Failure', '*');
       }
     };

     navigator.keyboard.getLayoutMap().then(onSuccess, onError);
   }
 };

 </script>
	<!DOCTYPE html>
	<script>
	'use strict';

	window.onmessage = message => {
	if (message.data === 'Ready') {
	let onSuccess = () => { parent.postMessage('Failure', '*'); };
	let onError = error => {
	if (error.name == 'InvalidStateError') {
	parent.postMessage('Success', '*');
	} else {
	parent.postMessage('Failure', '*');
	}
	};

	navigator.keyboard.getLayoutMap().then(onSuccess, onError);
	}
	};

	</script>