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Test Info:

<!DOCTYPE html><html><script>
function boom()
{
while (document.documentElement.firstChild)
document.documentElement.firstChild.remove();
document.documentElement.contentEditable = "true";
document.execCommand("strikethrough", false, null);
try { document.execCommand("justifyfull", false, null); } catch(e) { }
document.documentElement.offsetHeight;
try { document.execCommand("delete", false, null); } catch(e) { }
document.execCommand("inserthtml", false, "<span> <\/span>");
}
window.addEventListener("load", boom);
</script></html>