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chromium/third_party/blink/web_tests/fast/parser/xhtml-close-while-parsing.xhtml 

<html xmlns="http://www.w3.org/1999/xhtml">
<body>
    This tests that the XML parser doesn't fail if window.close() is called from a script tag while parsing.
    <script>
    if (window.testRunner) {
        testRunner.dumpAsText();
        testRunner.setPopupBlockingEnabled(false);
        testRunner.waitUntilDone();
    }
        
    window.open("resources/xhtml-close-while-parsing-target.xhtml");
    </script>
    If you see this text the test has passed.
</body>
</html>