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chromium/third_party/blink/web_tests/external/wpt/css/css-conditional/support/at-media-dynamic-001-inner.html 

<!doctype html>
<title>Reftest Reference</title>
<style>
  html { background: red; overflow: hidden; }
  @media (max-width: 100px) {
    html { background: green; }
  }
</style>