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Test Info:

<html xmlns="http://www.w3.org/1999/xhtml" style="width: 1px; white-space: pre-wrap;">y
<style>
html:first-letter { }
</style><script>
window.addEventListener("load", function(){
document.documentElement.offsetHeight;
document.documentElement.style.direction = "rtl";
document.documentElement.offsetHeight;
document.documentElement.style.margin = "3em";
document.documentElement.offsetHeight;
}, false);
</script></html>