paint-function-this-value.https.html

<!DOCTYPE html>
<html class="reftest-wait">
<meta charset="utf-8">
<title>Paint callback is invoked with `this` value of `paintInstance`</title>
<link rel="help" href="https://drafts.css-houdini.org/css-paint-api-1/#invoke-a-paint-callback">
<link rel="match" href="parse-input-arguments-ref.html">
<style>
.container {
  width: 100px;
  height: 100px;
}

#canvas-geometry {
  background-image: paint(geometry);
}
</style>
<script src="/common/reftest-wait.js"></script>
<script src="/common/worklet-reftest.js"></script>
<body>
<div id="canvas-geometry" class="container"></div>

<script id="code" type="text/worklet">
let paintInstance;

registerPaint('geometry', class {
    constructor() {
        paintInstance = this;
    }
    paint(ctx, geom) {
        if (this === paintInstance)
            ctx.fillStyle = 'green';
        else
            ctx.fillStyle = 'red';
        ctx.fillRect(0, 0, geom.width, geom.height);
    }
});
</script>

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

chromium/third_party/blink/web_tests/external/wpt/css/css-paint-api/paint-function-this-value.https.html