css/css-paint-api/style-first-letter-pseudo.https.html

<!DOCTYPE html>
<html class="reftest-wait">
<link rel="help" href="https://drafts.css-houdini.org/css-paint-api/">
<link rel="match" href="style-first-letter-pseudo-ref.html">
<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
<style>
div {
    color: rgb(0, 255, 0);
    line-height: 1px;
    height: 10px;
}

div::first-letter {
    background-image: paint(geometry);
    color: rgb(255, 0, 0);
    line-height: 2px;
}
</style>
<script src="/common/reftest-wait.js"></script>
<script src="/common/worklet-reftest.js"></script>
<body style="font: 10px/1 Ahem;">
<div>ppp</div>

<script id="code" type="text/worklet">
registerPaint('geometry', class {
    static get inputProperties() {
        return [
            'color',
            'line-height',
        ];
    }
    paint(ctx, geom, styleMap) {
        const properties = [...styleMap.keys()].sort();
        var serializedStrings = [];
        for (let i = 0; i < properties.length; i++) {
            const value = styleMap.get(properties[i]);
            let serialized;
            if (value)
                serialized = properties[i].toString() + ': [' + value.constructor.name + '=' + value.toString() + ']';
            else
                serialized = properties[i].toString() + ': [null]';
            serializedStrings.push(serialized);
        }
        ctx.fillStyle = 'green';
        if (serializedStrings[0] != "color: [CSSStyleValue=rgb(255, 0, 0)]")
            ctx.fillStyle = 'red';
        if (serializedStrings[1] != "line-height: [CSSUnitValue=2px]")
            ctx.fillStyle = 'blue';
        ctx.fillRect(0, 0, geom.width, geom.height);
    }
});
</script>

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