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<!DOCTYPE html>
This test passes if it does not crash.
<script>
var doc1 = document.documentElement;
let iframe1 = document.createElement("iframe");
doc1.appendChild(iframe1);
separateDoc = document.implementation.createDocument("", null);
iframe1.addEventListener("DOMFocusOut", function () { separateDoc.adoptNode(iframe1); });
iframe1.focus();
iframe1 = document.createElement("iframe");
doc1.appendChild(iframe1);
iframe1.focus();
</script>
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