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Test Info:
<script type="text/javascript">
function boom()
{
var r = document.documentElement;
r.style.position = "absolute";
r.contentEditable = "true";
r.focus();
r.contentEditable = "false";
r.focus();
r.contentEditable = "true";
document.execCommand("subscript", false, null);
r.contentEditable = "false";
}
window.addEventListener("load", boom, false);
</script>
</div>