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chromium/third_party/blink/web_tests/external/wpt/css/css-display/display-contents-block-002-ref.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Reftest Reference</title>
<link rel="author" title="Rune Lillesveen" href="mailto:[email protected]">
<p>You should see the word PASS with a 300px top margin below.</p>
<div style="margin-top: 300px">PASS</div>