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chromium/third_party/blink/web_tests/external/wpt/selection/shadow-dom/cross-shadow-boundary-1.html 

<!doctype html>
<head>
<link rel="match" href="cross-shadow-boundary-1-ref.html"/>
</head>
OuterText
<div id="host"></div>
<script>
  document.getElementById("host").attachShadow({mode: "open"}).innerHTML = "innerText";
  getSelection().selectAllChildren(document.body);
</script>