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Test Info:
- Manifest: dom/base/crashtests/crashtests.list
<title>Ensure GetCommonFlattenedTreeAncestorForSelection won't crash when the provided contents are equal</title>
<script>
window.addEventListener("DOMContentLoaded", () => {
let b = a.attachShadow({mode: "open"})
let c = document.getSelection()
b.append(null)
c.setBaseAndExtent(a, 1, b, 1)
})
</script>
<blockquote id="a">