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Test Info:

<!DOCTYPE html>
<html>
<head>
<script>
function boom()
{
document.documentElement.offsetHeight;
document.getElementById("d").focus();
document.getElementById("b").style.display = "inline";
document.getElementById("c").contentEditable = "false";
}
</script>
</head>
<body contenteditable="true" id="b" onload="setTimeout(boom, 200);"><div id="c"><input id="d"></div></body>
</html>