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chromium/third_party/blink/web_tests/external/wpt/svg/painting/will-change-under-mask.html 

<!DOCTYPE html>
<meta name="assert" content="will-change descendants should not affect masking">
<link rel="match" href="../struct/reftests/reference/green-100x100.html">
<svg width="200" height="200">
  <mask id="mask">
    <rect x="0" y="0" width="100" height="50" fill="white"/>
    <rect x="0" y="50" width="100" height="50" fill="black"/>
  </mask>
  <rect x="0" y="0" width="100" height="50" fill="red" />
  <rect x="0" y="50" width="100" height="50" fill="green" />
  <g mask="url('#mask')">
    <rect style="will-change: transform;" x="0" y="0" width="100" height="50" fill="green" />
    <rect style="will-change: transform;" x="0" y="50" width="100" height="50" fill="red" />
  </g>
</svg>