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Test Info:

<!DOCTYPE html>
<html>
<head>
<script>
function f(event) {
document.removeEventListener("DOMAttrModified", f);
// dumpln(event.attrChange); /* 2 (MutationEvent.ADDITION) */
// dumpln(event.attrName); /* "curpos" */
// dumpln(event.newValue); /* "0" */
// (gdb) break nsGlobalWindow::Dump
dump("[[[[DOMAttrModified\n");
document.removeChild(svgUse);
dump("]]]]\n");
}
var svgUse = document.createElementNS("http://www.w3.org/2000/svg", "use");
document.removeChild(document.documentElement);
document.addEventListener("DOMAttrModified", f);
document.appendChild(svgUse);
</script>
</head>
<body onload="boom();"></body>
</html>