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Test Info:
- Manifest: docshell/base/crashtests/crashtests.list
<script>
window.onload = () => {
b.addEventListener('DOMSubtreeModified', () => {
var o = document.getElementById('a')
var a = o.attributes
for (let j = 0; j < a.length; j++) {
o.setAttribute(a[j].name, 'i')
o.parentNode.appendChild(o)
}
})
b.setAttribute('a', b)
}
</script>
<iframe id='a' sandbox='' allowfullscreen=''></iframe>
<dfn id='b'>