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Test Info:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<script>
function boom()
{
document.documentElement.offsetHeight;
var emptyTail = q.firstChild.splitText(2);
document.documentElement.offsetHeight;
emptyTail.splitText(0);
}
</script>
</head>
<body onload="boom();"><div style="width: 1px; height: 1px;"><div id="q" style="writing-mode: vertical-rl;">R</div></div></body>
</html>