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chromium/third_party/blink/web_tests/external/wpt/contenteditable/synthetic-height-ref.html 

<!doctype html>
<title>CSS test reference</title>
<style>
  div { background: green; border: 1px solid; }
</style>
<div><br></div>
<div><br></div>
<div><br></div>
<div><br></div>