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chromium/third_party/blink/web_tests/external/wpt/css/css-paint-api/top-level-await-ref.html 

<!DOCTYPE html>
<canvas id="output" width="100" height="100" style="background: blue;"></canvas>
<script>
"use strict";
const canvas = document.getElementById('output');
const ctx = canvas.getContext('2d');

ctx.fillStyle = 'green';
ctx.fillRect(0, 0, 100, 100);
</script>