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chromium/third_party/blink/web_tests/external/wpt/css/css-transforms/transform3d-preserve3d-014.html 

<!DOCTYPE html>
<html>
  <head>
    <title>CSS Test (Transforms): Preserve-3D With display:contents intermediate</title>
    <link rel="author" title="Matt Woodrow" href="mailto:[email protected]">
    <link rel="help" href="http://www.w3.org/TR/css-transforms-2/#transform-style-property">
    <meta name="assert" content="This tests that when preserve-3d is specified,
    a 90-degree rotation on the parent plus a 90-degree rotation on the child
    cancel out, adding to a 180-degree rotation (which has no visible effect on
    a lime square). This still happens despite an intermediary div with display:contents.
    scale(2) is added to ensure that the test doesn't pass if the transforms are just ignored.">
    <link rel="match" href="transform-lime-square-ref.html">
  </head>
  <body style="padding:25px">
    <div style="transform: rotatex(90deg); transform-style: preserve-3d">
      <div style="display: contents">
        <div style="transform: rotatex(90deg) scale(2); width: 50px; height: 50px; background: lime"></div>
      </div>
    </div>
  </body>
</html>