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

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>CSS Masking: mask-mode with vector image</title>
    <link rel="author" title="Ethan Lin" href="mailto:[email protected]">
    <link rel="author" title="Mozilla" href="https://www.mozilla.org">
    <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">
      div {
        background-color: blue;
        position: absolute;
        margin: 0px;
        padding: 0px;
        width: 100px;
        height: 100px;
        top: 10px;
      }

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

      div.match-alpha {
        left: 120px;
        mask-mode: match-source;
        mask-image: url("#svg-alpha");
      }

      div.luminance-luminance {
        top: 120px;
        left: 10px;
        mask-mode: luminance;
        mask-image: url("#svg-luminance");
      }

      div.luminance-alpha {
        top: 120px;
        left: 120px;
        mask-mode: luminance;
        mask-image: url("#svg-alpha");
      }

      div.alpha-luminance {
        top: 230px;
        left: 10px;
        mask-mode: alpha;
        mask-image: url("#svg-luminance");
      }

      div.alpha-alpha {
        top: 230px;
        left: 120px;
        mask-mode: alpha;
        mask-image: url("#svg-alpha");
      }

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

      #svg-alpha {
        mask-type: alpha;
      }
    </style>
  </head>
  <body>
    <div class="match-luminance"></div>
    <div class="match-alpha"></div>
    <div class="luminance-luminance"></div>
    <div class="luminance-alpha"></div>
    <div class="alpha-luminance"></div>
    <div class="alpha-alpha"></div>
    <svg xmlns="http://www.w3.org/2000/svg">
      <defs>
        <mask id="svg-luminance">
          <rect x="0" y="0" width="100%" height="100%" fill="blue"/>
        </mask>
        <mask id="svg-alpha">
          <rect x="0" y="0" width="100%" height="100%" fill="blue"/>
        </mask>
      </defs>
    </svg>
  </body>
</html>