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

<!DOCTYPE html>
<canvas id="c"></canvas>
<script type="text/javascript">
const color = "rgba(120, 45, 200, 0.7)"; // A kind of half purple
const canvas = document.getElementById("c");
const ctx = canvas.getContext("2d");
// Opaque canvases have black backgrounds on pixels that haven't been drawn to
ctx.fillStyle = "black";
ctx.fillRect(0, 0, canvas.width, canvas.height);
ctx.fillStyle = color;
ctx.fillRect(10, 10, 100, 100);
</script>
</html>