<!DOCTYPE html>
<html>
<head>
<script src="../../resources/js-test.js"></script>
</head>
<body>
<unknown>
<script></script>
<textarea></textarea>
<script>
function onDOMNodeRemoved(e) {
    if (!(e.srcElement instanceof Element))
        return;

    e.srcElement.insertAdjacentHTML('afterbegin', ' ');
    document.execCommand('FontSizeDelta', false, '1px');
}

document.addEventListener("DOMNodeRemoved", onDOMNodeRemoved, false);
document.designMode = "on";
document.execCommand("SelectAll", false)
var unknown = document.getElementsByTagName("unknown")[0];
unknown.textContent = "sss";
unknown.outerHTML = "";
document.execCommand("SelectAll", false);
// Put description() here so as to not upset test condition.
description("Verify that changing the style over an unknown element does not crash.");
</script>
</body>
</html>