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Test Info:

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<!--
user_pref("dom.webcomponents.enabled", true);
-->
<script>
function boom() {
var x = document.createElementNS("http://www.mozilla.org/xbl", "children");
x.appendChild(document.createTextNode("t"));
document.body.attachShadow({ mode: "open" }).appendChild(x);
}
</script>
</head>
<body onload="boom();"></body>
</html>