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chromium/third_party/blink/web_tests/fast/frames/set-parent-src-synchronously-xhtml.xhtml 

<html xmlns="http://www.w3.org/1999/xhtml">
<body>
This test fails if we crash or any text below this is visible (the iframe should detach itself from the page).
<iframe id="parent" src="resources/set-src-to-javascript-url.xhtml"></iframe>
</body>
</html>