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chromium/third_party/blink/web_tests/external/wpt/css/css-paint-api/paint2d-rects.https.html 

<!DOCTYPE html>
<html class="reftest-wait">
<link rel="help" href="https://drafts.css-houdini.org/css-paint-api/">
<link rel="match" href="paint2d-rects-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">
registerPaint('rects', class {
    paint(ctx, geom) {
        ctx.fillStyle = 'green';
        ctx.fillRect(0, 0, geom.width, geom.height);

        ctx.clearRect(40, 40, 20, 20);

        ctx.strokeStyle = 'red';
        ctx.lineWidth = 4;
        ctx.strokeRect(20, 20, 60, 60);
    }
});
</script>

<script>
    importWorkletAndTerminateTestAfterAsyncPaint(CSS.paintWorklet, document.getElementById('code').textContent);
</script>
</body>
</html>