line-dash-scale-with-page-zoom.html

<!DOCTYPE html>
<html>
<script src="./resources/test-runner-paint-worklet.js"></script>
<style>
html, body { margin: 0; padding: 0; }
.container {
  width: 200px;
  height: 200px;
}

#canvas-shadow {
  background-image: paint(shadow);
}
</style>
<body>
<div id="canvas-shadow" class="container"></div>

<script id="code" type="text/worklet">
registerPaint('shadow', class {
    paint(ctx) {
        ctx.lineWidth = 10;
        ctx.setLineDash([5, 15]);
        ctx.lineDashOffset = 2;

        // The values should not be affected by the browser zoom when queried
        // from JS.
        if (ctx.lineWidth == 10 && ctx.lineDashOffset == 2 &&
            ctx.getLineDash()[0] == 5 && ctx.getLineDash()[1] == 15) {
            ctx.beginPath();
            ctx.moveTo(0, 50);
            ctx.lineTo(200, 50);
            ctx.stroke();
        }
    }
});
</script>

<script>
    document.body.style.zoom = "200%"
    importPaintWorkletThenEndTest(document.getElementById('code').textContent);
</script>
</body>
</html>

chromium/third_party/blink/web_tests/http/tests/csspaint/line-dash-scale-with-page-zoom.html