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chromium/third_party/blink/web_tests/external/wpt/css/css-transforms/transform3d-rotatey-ref.html 

<!DOCTYPE html>
<html>
  <head>
    <title>CSS Reftest Reference</title>
    <link rel="author" title="Matt Woodrow" href="mailto:[email protected]">
    <link rel="author" title="Aryeh Gregor" href="mailto:[email protected]">
  </head>
  <body>
    <div style="transform: rotatey(45deg); width: 100px; height: 100px;
      background: lime"></div>
  </body>
</html>