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<!DOCTYPE html>
<html>
<body>
<fieldset id="fs1"><legend>#2</legend></fieldset>
<fieldset id="fs2"><legend>#1</legend><legend>#2</legend></fieldset>
<script>
document.body.offsetHeight;
var fs1 = document.getElementById("fs1");
var l = document.createElement("legend");
l.textContent = "#1";
fs1.insertBefore(l, fs1.firstChild);
var fs2 = document.getElementById("fs2");
fs2.removeChild(fs2.firstChild);
</script>
</body>
</html>
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