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chromium/third_party/blink/web_tests/accessibility/hang-in-isignored.html 

<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
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<script src="../resources/js-test.js"></script>
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<p id="description"></p>
<div id="console"></div>

<script>

    description("This tests that we will not hang when using accessibility on this page. The idea is that the element tree is deep enough to cause a hang just by accessing elements if something is implemented incorrectly.");

    if (window.accessibilityController) {

        document.getElementById("body").focus();
        var body = accessibilityController.focusedElement;
        
        // if successful, we will NOT hang after this call
        body.childAtIndex(0).childAtIndex(0);
    }

</script>

</body>
</html>