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chromium/third_party/blink/web_tests/external/wpt/css/css-masking/clip-path/clip-path-scaled-video.html 

<!DOCTYPE html>
<html class="reftest-wait">
<meta name="assert" content="There should be no hairline along the edges of clip-path bounding box">
<link rel="help" href="https://drafts.fxtf.org/css-masking/#ClipPathElement">
<link rel="help" href="https://crbug.com/1171601">
<link rel="match" href="clip-path-scaled-video-ref.html">
<script src="/common/reftest-wait.js"></script>
<body style="overflow: hidden">
<p>Expect no hairlines below.</p>
<svg width="700" height="550">
  <!-- Clipping the video-->
  <clipPath id="clip">
    <polygon points="100,100 250,250"/>
  </clipPath>
  <g clip-path="url(#clip)" transform="scale(0.112)">
    <foreignObject width="320" height="240">
      <video src="/media/test.webm" autoplay loop></video>
    </foreignObject>
  </g>
  <g clip-path="url(#clip)" transform="scale(0.345)">
    <foreignObject width="320" height="240">
      <video src="/media/test.webm" autoplay loop></video>
    </foreignObject>
  </g>
  <g clip-path="url(#clip)" transform="scale(0.778)">
    <foreignObject width="320" height="240">
      <video src="/media/test.webm" autoplay loop></video>
    </foreignObject>
  </g>
  <g clip-path="url(#clip)" transform="scale(0.912)">
    <foreignObject width="320" height="240">
      <video src="/media/test.webm" autoplay loop></video>
    </foreignObject>
  </g>
  <g clip-path="url(#clip)" transform="scale(1.678)">
    <foreignObject width="320" height="240">
      <video src="/media/test.webm" autoplay loop></video>
    </foreignObject>
  </g>
  <g clip-path="url(#clip)" transform="scale(3.333)">
    <foreignObject width="320" height="240">
      <video src="/media/test.webm" oncanplaythrough="takeScreenshot()" autoplay loop></video>
    </foreignObject>
  </g>
</svg>
</body>