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Test Info:
- Manifest: docshell/base/crashtests/crashtests.list
<script>
window.onload = () => {
a.addEventListener("DOMSubtreeModified", () => {
document.body.appendChild(b)
document.body.removeChild(b)
window[1]
})
a.type = ""
}
</script>
<embed id="a">
<iframe id="b"></iframe>