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chromium/third_party/blink/web_tests/fast/canvas/canvas-no-alpha-invalidation-expected.html 

<!DOCTYPE html>
<p>Expect to see a black square below this line.</p>
<canvas id = 'c' width='100' height='100'></canvas>
<script>
document.getElementById('c').getContext('2d').fillRect(0, 0, 100, 100);
</script>