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chromium/third_party/blink/web_tests/external/wpt/css/css-backgrounds/animations/two-background-color-animation-diff-length2-ref.html 

<!DOCTYPE html>
<body>
  <canvas id="canvas" width="100" height="100"></canvas>
</body>
<script>
  var canvas = document.getElementById('canvas');
  var ctx = canvas.getContext('2d');
  ctx.fillStyle = 'rgb(0, 0, 199)';
  ctx.fillRect(0, 0, 100, 100);
</script>