<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>CSS Masking: mask-composite: compose svg mask</title>
    <link rel="author" title="CJ Ku" href="mailto:cku@mozilla.com">
    <link rel="author" title="Mozilla" href="https://www.mozilla.org">
    <link rel="help" href="http://www.w3.org/TR/css-masking-1/#the-mask-composite">
    <link rel="match" href="mask-composite-1-ref.html">
    <meta name="assert" content="Test checks that vector-mask-image can be composed correctly by different mask-composite value.">
    <svg height="0">
      <mask id="rectMask" x="0" y="0" width="100" height="100" >
        <rect x="0" y="50" width="100" height="50" style="stroke:none; fill: #ffffff"/>
      </mask>
    </svg>
    <style type="text/css">
      div {
        background-color: blue;
        position: absolute;
        margin: 0px;
        padding: 0px;
        width: 100px;
        height: 100px;
        top:10px;
        mask-image: url(#rectMask),
                    url(#rectMask);
      }

      div.add {
        left: 10px;
        mask-composite: add;
      }

      div.subtract {
        left: 120px;
        mask-composite: subtract;
      }

      div.intersect {
        left: 230px;
        mask-composite: intersect;
      }

      div.exclude {
        left: 340px;
        mask-composite: exclude;
      }
    </style>
  </head>
  <body>
    <div class="add"></div>
    <div class="subtract"></div>
    <div class="intersect"></div>
    <div class="exclude"></div>
  </body>
</html>
