430332-1.html
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<html>
<body style="font-family:monospace; width:6ch;">
<b>ab</b> cd
<b>ab</b> cd
<b>ab</b> cd
<b>ab</b> cd
<b>ab</b> cd
<b>ab</b> cd
<b>ab</b> cd
<b>ab</b> cd<span id="s">ef</span>
<script>
document.body.clientWidth;
document.getElementById("s").style.fontSize = "200%";
</script>
</body>
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