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chromium/third_party/blink/web_tests/external/wpt/css/css-transforms/transform-iframe-ref.html 

<!DOCTYPE html>
<html>
  <head>
    <title>CSS Reftest Reference</title>
    <link rel="author" title="Clint Talbert" href="mailto:[email protected]">
    <link rel="author" title="Aryeh Gregor" href="mailto:[email protected]">
    <style>
      iframe {
        overflow: hidden;
        height: 200px;
        width: 300px;
      }
    </style>
    <iframe src="about:blank"></iframe>
  </body>
</html>