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diff --git a/dom/base/crashtests/1508845.html b/dom/base/crashtests/1508845.html
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+<script>
+window.onload=function(){
+ let bigShadowTree = `<div>`;
+ for (let i = 0; i < 10; ++i)
+ bigShadowTree = bigShadowTree + bigShadowTree;
+ b.attachShadow({ mode: 'open' }).innerHTML = bigShadowTree;
+ // Create wrappers for all those elements.
+ [...b.shadowRoot.querySelectorAll('*')].forEach(() => {});
+ document.documentElement.addEventListener('DOMNodeRemoved', function(){
+ window.frames[0].document.body.appendChild(b)
+ })
+ window.frames[0].document.body.appendChild(a)
+}
+</script>
+<mark id='a'>
+<iframe></iframe>
+<div id='b'>