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chromium/third_party/blink/web_tests/external/wpt/html/browsers/windows/browsing-context-names/resources/choose-_parent-002-iframe.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>HTML Test: browsing context name - parent: nested context</title>
<iframe name="iframeChild" src="open-in-_parent.html"></iframe>