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Test Info:

<head>
<script>
function boom()
{
document.designMode = 'on';
document.execCommand("indent", false, null);
document.execCommand("insertText", false, "a");
document.execCommand("forwardDelete", false, null);
document.execCommand("justifyfull", false, null);
}
window.addEventListener("load", boom, false);
</script>
</head>
<body> <span class="v"></span></body><body><input type="file" /></body>
</html>