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chromium/third_party/blink/web_tests/fast/events/focusingUnloadedFrame.html 

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Frameset//EN"
"http://www.w3.org/TR/html4/frameset.dtd">
<html>
<head>


<script>
onload = function() {
    if (!window.testRunner)
        return;

    testRunner.dumpAsText();
    testRunner.dumpChildFrames();
    
    var modifiers = ["altKey"];
    eventSender.keyDown("\t", modifiers);
    eventSender.keyDown("\t", modifiers);
}
</script>

</head>
<frameset>
    <frame src="resources/frontpage.html">  <!-- A page containing a link -->
    <frame src="resources/notfound.html">   <!-- A page that can't be found -->
</frameset>
</html>