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Test Info:
<!DOCTYPE html>
<html>
<head>
<script type="text/javascript">
function uu()
{
document.removeEventListener("DOMSubtreeModified", uu);
document.execCommand("undo", false, null);
}
function boom()
{
document.execCommand("selectAll", false, null);
document.execCommand("strikethrough", false, null);
document.addEventListener("DOMSubtreeModified", uu);
document.execCommand("undo", false, null);
}
</script>
</head>
<body contenteditable="true" onload="boom();"><div></div></body>
</html>