gecko-dev/layout/reftests/svg/dynamic-mask-contents-01.svg

<!--
     Any copyright is dedicated to the Public Domain.
     http://creativecommons.org/publicdomain/zero/1.0/
-->
<svg xmlns="http://www.w3.org/2000/svg" onload="startTest()" class="reftest-wait">
  <style>
  .foo .maskrect { fill:white; }
  </style>

  <defs id="d">
    <mask id="m1" maskUnits="objectBoundingBox" maskContentUnits="objectBoundingBox">
      <rect class="maskrect" width="1" height="1"/>
    </mask>
  </defs>

  <rect id="rect" width="100%" height="100%" fill="lime" mask="url(#m1)"/>

  <script>
  function startTest() {
    document.addEventListener("MozReftestInvalidate", doTest, false);
    setTimeout(doTest, 4000); // fallback for running outside reftest
  }

  function doTest() {
    document.getElementById("d").setAttribute("class", "foo");
    document.documentElement.removeAttribute("class");
  }
  </script>
</svg>