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chromium/third_party/blink/web_tests/fast/events/tabindex-focus-blur-all.html 

<html>
<script src="resources/tabindex-focus-blur-all.js"></script>

<frameset cols="33%, 33%, *" onload="test()">
<frame src="resources/tabindex-focus-blur-all-frame1.html"/>
<frame src="resources/tabindex-focus-blur-all-frame2.html"/>
<frame src="resources/tabindex-focus-blur-all-frame3.html"/>
</frameset>
</html>