chromium/third_party/blink/web_tests/svg/custom/viewport-resource-inval-expected.svg

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  <defs>
    <mask id="mask">
      <rect width="25%" height="25%" fill="white"/>
    </mask>

    <clipPath id="clip">
      <rect x="27%" width="25%" height="25%"/>
    </clipPath>

    <pattern id="pattern" patternUnits="userSpaceOnUse" x="0" y="0" width="800" height="800">
      <rect x="54%" width="25%" height="25%" fill="green"/>
    </pattern>
  </defs>

  <rect width="25%" height="25%" fill="red"/>
  <rect width="800" height="800" fill="green" mask="url(#mask)"/>

  <rect x="27%" width="25%" height="25%" fill="red"/>
  <rect width="800" height="800" fill="green" clip-path="url(#clip)"/>

  <rect x="54%" width="25%" height="25%" fill="red"/>
  <rect width="800" height="800" fill="url(#pattern)"/>
</svg>