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Test Info:

<!DOCTYPE html>
<html>
<head>
<script type="text/javascript">
function boom()
{
document.getElementById("div").focus();
document.execCommand("bold", false, null);
}
</script>
</head>
<body onload="boom();">
<div id="div" style="position: absolute" contenteditable="true"></div>
</body>
</html>