canvas-filter-shadow-expected.html

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<!DOCTYPE html>

<body>

  <canvas id="canvas" width="300" height="300"></canvas>

</body>

<script>

/*

  The expected behavior of filter-generated shadows is tested against

  a drawing using only rectangles that draws the shadows manually.

*/

  var canvas = document.getElementById('canvas');

  var ctx = canvas.getContext('2d');

  ctx.fillStyle = 'red';

  ctx.fillRect(20, 20, 50, 50);

  ctx.fillStyle = 'black';

  ctx.fillRect(10, 10, 50, 50);

</script>