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

<!DOCTYPE html>
<html class="reftest-wait">
<link rel="help" href="https://html.spec.whatwg.org/#calling-scripts">
<link rel="match" href="top-level-await-ref.html">
<style>
#output {
    width: 100px;
    height: 100px;
    background-image: paint(rects);
    background-color: blue;
}
</style>
<script src="/common/reftest-wait.js"></script>
<script src="/common/worklet-reftest.js"></script>
<body>
<div id="output"></div>

<script id="code" type="text/worklet">
// This will cause a syntax error, and the paint processor will never get registered, in browsers
// without top-level await support.
await 1;

registerPaint('rects', class {
    async paint(ctx, geom) {
        ctx.fillStyle = 'green';
        ctx.fillRect(0, 0, geom.width, geom.height);
    }
});
</script>

<script>
"use strict";
importWorkletAndTerminateTestAfterAsyncPaint(CSS.paintWorklet, document.getElementById('code').textContent);
</script>