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chromium/third_party/blink/web_tests/external/wpt/html/canvas/element/manual/filters/tentative/canvas-filter-object-blur.html 

<head>
    <link rel="match" href="canvas-filter-object-blur-expected.html">
</head>
<body>
  <canvas id="canvas" width="300" height="300"></canvas>
</body>
<script>
  var canvas = document.getElementById('canvas');
  var ctx = canvas.getContext('2d');
  ctx.filter = new CanvasFilter({name: "gaussianBlur", stdDeviation: 2});
  ctx.fillStyle = 'yellow';
  ctx.fillRect(10,10,100,100);
  ctx.filter = new CanvasFilter({name: "gaussianBlur", stdDeviation: 5});
  ctx.fillStyle = 'magenta';
  ctx.fillRect(120, 10, 100, 100);
  ctx.filter = new CanvasFilter([
    {name: "gaussianBlur", stdDeviation: 5},
    {name: "gaussianBlur", stdDeviation: 10}]);
  ctx.fillStyle = 'cyan';
  ctx.fillRect(10, 120, 100, 100);
  ctx.filter = 'none';
  ctx.fillStyle = 'black';
  ctx.fillRect(120, 120, 100, 100);
</script>