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chromium/third_party/blink/web_tests/external/wpt/css/css-masking/mask-image/mask-mode-to-mask-type-svg.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Masking: mask-mode with SVG &lt;mask></title>
<link rel="help" href="https://www.w3.org/TR/css-masking-1/#propdef-mask-mode">
<link rel="match" href="mask-mode-to-mask-type-ref.html">
<meta name="fuzzy" content="maxDifference=0-1;totalPixels=0-30000">
<meta name="assert" content="Test checks the fallback logic between mask-mode and mask-type.">
<style type="text/css">
  body {
    padding: 0;
    margin: 0;
  }

  rect {
    fill: blue;
    width: 100px;
    height: 100px;
  }

  rect.match-luminance {
    x: 10px;
    y: 10px;
    mask-mode: match-source;
    mask-image: url("#svg-luminance");
  }

  rect.match-alpha {
    x: 120px;
    y: 10px;
    mask-mode: match-source;
    mask-image: url("#svg-alpha");
  }

  rect.luminance-luminance {
    x: 10px;
    y: 120px;
    mask-mode: luminance;
    mask-image: url("#svg-luminance");
  }

  rect.luminance-alpha {
    x: 120px;
    y: 120px;
    mask-mode: luminance;
    mask-image: url("#svg-alpha");
  }

  rect.alpha-luminance {
    x: 10px;
    y: 230px;
    mask-mode: alpha;
    mask-image: url("#svg-luminance");
  }

  rect.alpha-alpha {
    x: 120px;
    y: 230px;
    mask-mode: alpha;
    mask-image: url("#svg-alpha");
  }

  #svg-luminance {
    mask-type: luminance;
  }

  #svg-alpha {
    mask-type: alpha;
  }
</style>
<svg width="220" height="330">
  <rect class="match-luminance"/>
  <rect class="match-alpha"/>
  <rect class="luminance-luminance"/>
  <rect class="luminance-alpha"/>
  <rect class="alpha-luminance"/>
  <rect class="alpha-alpha"/>

  <mask id="svg-luminance" maskContentUnits="objectBoundingBox">
    <rect width="100%" height="100%" fill="blue"/>
  </mask>
  <mask id="svg-alpha" maskContentUnits="objectBoundingBox">
    <rect width="100%" height="100%" fill="blue"/>
  </mask>
</svg>