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<!DOCTYPE html>
<head>
<script>
function doTest() {
var d = document.createElement("div");
d.textContent = "This is a test";
var l = document.getElementById("l");
l.textContent = "before";
l.appendChild(d);
l.appendChild(document.createTextNode("after"));
}
</script>
</head>
<body onload="doTest()">
<fieldset>
<legend style="border: 2px solid green">This is a test</legend>
First fieldset
</fieldset>
<fieldset>
<legend id="l" style="border: 2px solid green"></legend>
First fieldset
</fieldset>
</body>