chromium/src/third_party/blink/web_tests/fast/frames/srcdoc/srcdoc-beats-src-dom.html - manifest_repos/chromium_src - Git at Google

 <body>
 <script>
 if (window.testRunner)
     testRunner.dumpAsText();

 var ifrm = document.createElement("iframe");
 ifrm.srcdoc = "PASS";
 ifrm.src = "data:text/html,<script>alert(/FAIL/);<\/script>";
 document.body.appendChild(ifrm);
 </script>
 This test passes if it doesn't alert FAIL.
	<body>
	<script>
	if (window.testRunner)
	testRunner.dumpAsText();

	var ifrm = document.createElement("iframe");
	ifrm.srcdoc = "PASS";
	ifrm.src = "data:text/html,<script>alert(/FAIL/);<\/script>";
	document.body.appendChild(ifrm);
	</script>
	This test passes if it doesn't alert FAIL.