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

<canvas id="c" width="200" height="100"></canvas>
<script>
// Test that validates that the shadow offset is not modified when doing a scale
// with or without a filter.
// Note: The color seem pretty randome. That's to add robustness to the test.
const canvas = document.getElementById('c')
const ctx = canvas.getContext('2d')
ctx.filter = 'none';
ctx.shadowOffsetX = 10;
ctx.shadowOffsetY = 10;
ctx.shadowColor = 'rgba(75,27,42,0.5)';
ctx.fillStyle = 'rgba(27,75,42,0.5)';
ctx.fillRect(0, 0, 40, 40);

ctx.filter = 'hue-rotate(180deg)';
ctx.fillRect(100, 0, 40, 40);
</script>