chromium/src/third_party/blink/web_tests/fast/events/touch/resources/frame-touchevent-forwarder.html - manifest_repos/chromium_src - Git at Google

 <!DOCTYPE html>
 <style>
 html {
   border: 1px solid blue;
   box-sizing: border-box;
   width: 100%;
   height: 100%;
 }
 </style>
 <script>
     document.addEventListener('touchstart', function(e) {
         parent.onTouchStart(e);
     });
 </script>
 Iframe
	<!DOCTYPE html>
	<style>
	html {
	border: 1px solid blue;
	box-sizing: border-box;
	width: 100%;
	height: 100%;
	}
	</style>
	<script>
	document.addEventListener('touchstart', function(e) {
	parent.onTouchStart(e);
	});
	</script>
	Iframe