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Test Info:

<!DOCTYPE html>
<html style="width: 1px;">
<head>
<style>
p:first-letter { }
</style>
<script>
function boom()
{
var p = document.querySelector("p");
document.documentElement.offsetHeight;
p.style.direction = "ltr";
document.documentElement.offsetHeight;
p.style.letterSpacing = "-56px";
document.documentElement.offsetHeight;
}
</script>
</head>
<body onload="boom();">
<p style="direction: rtl; column-count: 3; white-space: pre-line;">x y
</p>
</body>
</html>