<!DOCTYPE html>
<html style="direction: rtl; -moz-column-width: 1px;"><head><script>
function boom()
{
document.documentElement.offsetHeight;
document.body.style.unicodeBidi = "bidi-override";
document.documentElement.offsetHeight;
}
</script></head><body style="white-space: pre;" onload="boom();">
H
</body></html>