chromium/third_party/blink/web_tests/fast/canvas/canvas-filter-undefined-expected.html

<canvas id="canvas" width="100" height="100"></canvas>
<script>
var canvas = document.getElementById('canvas');
var ctx = canvas.getContext('2d');
ctx.fillStyle = '#0f0';
ctx.fillRect(0, 0, 90, 90);
</script>