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chromium/third_party/blink/web_tests/external/wpt/css/filter-effects/morphology-mirrored.html 

<!DOCTYPE html>
<title>feMorphology filter on mirrored content</title>
<link rel="help" href="https://drafts.fxtf.org/filter-effects-1/#feMorphologyElement">
<link rel="match" href="reference/green-100x100.html">
<svg>
  <filter id="dilate" filterUnits="userSpaceOnUse"
          color-interpolation-filters="sRGB">
    <feMorphology operator="dilate" radius="10"/>
  </filter>
  <rect width="100" height="100" fill="red"/>
  <rect x="10" y="10" width="80" height="30" fill="green" filter="url(#dilate)"
        transform="translate(0, 50) scale(1, -1)"/>
  <rect x="10" y="60" width="80" height="30" fill="green" filter="url(#dilate)"
        transform="translate(100, 0) scale(-1, 1)"/>
</svg>