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Test Info:

<!doctype html>
<html>
<head>
<link rel=match href="cross-shadow-boundary-select-document-ref.html">
</head>
<div></div>
<script>
const root = document.querySelector("div").attachShadow({mode: "open"});
root.innerHTML = "CONTENT";
getSelection().setBaseAndExtent(document, 0, root.firstChild, 2);
</script>
</html>