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<!DOCTYPE html>
<html class="reftest-wait">
  <head>
    <meta charset="utf-8">
    <title>CSS Masking: mask invalidation.</title>
    <style type="text/css">
      div.outer {
        position: absolute;
        background-color: purple;
        border: solid purple;
        width: 200px;
        height: 200px;
      }

      div.mask {
        mask-image: url(#m1);
      }

      div.inner {
        width: 5px;
        height: 5px;
        border: 1px solid transparent;
        will-change: transform;
      }

    </style>
  </head>
  <body>
    <div id="d1" class="outer mask"><div class="inner"></div></div>
    <script type="text/javascript">
      function changeMask()
      {
        document.getElementById("r1").setAttribute("width", "50");
        document.getElementById("r1").setAttribute("height", "50");
        document.getElementById("r1").setAttribute("x", "100");
        document.getElementById("r1").setAttribute("y", "100");

        document.documentElement.removeAttribute("class");
      }

      document.addEventListener("MozReftestInvalidate",
                                changeMask);
    </script>
    <svg height="0">
      <mask id="m1" x="0" y="0" width="1" height="1">
        <rect id="r1" x="50" y="50" width="100" height="100" style="stroke:none; fill: #ffffff;"/>
      </mask>
    </svg>
  </body>
</html>