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chromium/third_party/blink/web_tests/accessibility/virtual-node-child-removal.html 

<!DOCTYPE html>
<html>
<body>

<script src="../resources/testharness.js"></script>
<script src="../resources/testharnessreport.js"></script>

<div id="main">main</div>

<script>
test(function() {
    var main = document.getElementById("main");

    var button_accNode = new AccessibleNode();
    button_accNode.role = "button";
    main.accessibleNode.appendChild(button_accNode);

    var axMain = accessibilityController.accessibleElementById("main");
    var axButton = axMain.childAtIndex(0);
    button_accNode.role = "radio";
    // Upon removing button_accNode, we should make sure it is detached from
    // document and all reference in cache is cleared so no DCHECK or crash
    // occurs.
    main.accessibleNode.removeChild(button_accNode);
});
</script>

</body>
</html>