css/css-paint-api/paint2d-composite.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-composite-ref.html">
<style>
    div {
        display: inline-block;
        width: 80px;
        height: 80px;
    }
    #source-over { background-image: paint(source-over); }
    #source-in { background-image: paint(source-in); }
    #source-out { background-image: paint(source-out); }
    #source-atop { background-image: paint(source-atop); }
    #destination-over { background-image: paint(destination-over); }
    #destination-in { background-image: paint(destination-in); }
    #destination-out { background-image: paint(destination-out); }
    #destination-atop { background-image: paint(destination-atop); }
    #lighter { background-image: paint(lighter); }
    #xor { background-image: paint(xor); }
</style>
<script src="/common/reftest-wait.js"></script>
<script src="/common/worklet-reftest.js"></script>
<body>
<div id="source-over"></div>
<div id="source-in"></div>
<div id="source-out"></div>
<div id="source-atop"></div>
<br>
<div id="destination-over"></div>
<div id="destination-in"></div>
<div id="destination-out"></div>
<div id="destination-atop"></div>
<br>
<div id="lighter"></div>
<div id="xor"></div>

<script id="code" type="text/worklet">
var compositeOps = [
    'source-over',
    'source-in',
    'source-out',
    'source-atop',
    'destination-over',
    'destination-in',
    'destination-out',
    'destination-atop',
    'lighter',
    'xor'
];

function doPaint(ctx, op) {
    ctx.fillStyle = 'red';
    ctx.fillRect(5, 5, 40, 40);

    ctx.globalCompositeOperation = op;

    ctx.fillStyle = 'deepskyblue';
    ctx.beginPath();
    ctx.arc(45,45,20,0,Math.PI*2,true);
    ctx.fill();
}

for (var i = 0; i < compositeOps.length; i++) {
    let op = compositeOps[i];
    registerPaint(op, class { paint(ctx, geom) { doPaint(ctx, op); } });
}
</script>

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