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

<!doctype html>
OuterText1
<div>innerText1</div>
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<div><img style="width: 10px; height: 10px; background-color: black"></img></div>
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<script>
  getSelection().setBaseAndExtent(document.body.firstChild, 3, document.body.childNodes[4], 3);
</script>