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chromium/third_party/blink/web_tests/fast/canvas/reset-after-flush.html 

<!DOCTYPE html>
<p>Resetting after flush shouldn't preserve previous drawing.</p>
<canvas id="canvas" width="100" height="100"></canvas>
<script>

const canvas = document.getElementById('canvas');
const ctx = canvas.getContext('2d');

ctx.fillStyle = 'red';
ctx.fillRect(0, 0, 16, 16);

canvas.toDataURL();  // Forces a flush.

ctx.reset();

ctx.fillStyle = 'blue';
ctx.fillRect(32, 0, 16, 16);
</script>