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Test Info:

<html xmlns="http://www.w3.org/1999/xhtml" style="white-space: pre;">
<head>
<style>
#f:first-letter { }
#g:first-letter { float:left; }
</style>
<script>
function boom(id)
{
var text = document.getElementById(id).firstChild;
text.splitText(2);
document.documentElement.offsetHeight;
text.splitText(0);
}
</script>
</head>
<body onload="boom('f');boom('g');">
<div id="f">
X</div>
<div id="g">
X</div>
</body>
</html>