FileAPI/support/url-origin.html - external/w3c/web-platform-tests.git - Git at Google

 <!DOCTYPE html>
 <script>
 const blob = new Blob(["Test Blob"]);
 const url = URL.createObjectURL(blob);
 window.parent.postMessage({url: url}, '*');
 </script>
	<!DOCTYPE html>
	<script>
	const blob = new Blob(["Test Blob"]);
	const url = URL.createObjectURL(blob);
	window.parent.postMessage({url: url}, '*');
	</script>