<!DOCTYPE html>

<html>
<head>
  <style>
    .box {
        position: relative;
        height: 200px;
        width: 200px;
        background-color: green;
    }
    
    .blurry {
        margin: 50px;
        -webkit-filter: blur(10px);
    }
    
    #change {
        height: 100px;
        width: 100px;
        top: 50px;
        left: 50px;
        background-color: red;
    }
  </style>
  <script src="../../fast/repaint/resources/repaint.js"></script>
  <script>
      if (window.testRunner) {
          testRunner.dumpAsText(true);
          // Force software rendering mode.
          window.testRunner.overridePreference("WebKitAcceleratedCompositingEnabled", "0");
      }

      function repaintTest()
      {
          document.getElementById('change').style.backgroundColor = "green";
      }
  </script>
</head>
<body onload="runRepaintTest()">

  <div class="blurry box">
      <div id="change" class="box">
      </div>
  </div>

</body>
</html>