color-layers-no-blend-mode-ref.html

<!doctype html>
<style>
.reference { width: 50px; height: 50px; position: relative; display: inline-block; }
.reference > div {
    position: absolute;
    width: 100%;
    height: 100%;
}
</style>
<body>
<script>
    function createReference(colors) {
        const div = document.createElement("div");
        div.className = "reference";
        const layers = colors.map(color => {
            const layer = document.createElement("div");
            layer.style.backgroundColor = color;
            return layer;
        }).toReversed();
        div.append(...layers);
        return div;
    }
    const opaqueColors = [
        "red",
        "blue",
        "green",
        "purple",
        "orange",
        "color(display-p3 1 0.5 0)",
        "currentcolor",
        "canvas",
        "color-mix(in lab, red, blue)",
    ];
    const semiTransparentColors = [
        "rgb(from yellow r g b / 0.5)",
        "rgba(0, 255, 128, 0.6)",
        "color-mix(in lab, purple, rgba(0,0,0,0.5))",
        "hsla(0, 100%, 20%, 0.4)",
    ];

    // Test layering with opaque colors on top (top color wins)
    for (const opaqueColor of opaqueColors) {
        document.body.append(createReference([opaqueColor, ...semiTransparentColors]));
    }
    // Test layering multiple semi-transparent colors
    for (let i = 0; i < semiTransparentColors.length; i++) {
        let sliceUntilEndMinusI = semiTransparentColors.slice(0, semiTransparentColors.length - i);
        let sliceUntilI = semiTransparentColors.slice(0, i);
        let sliceFromIPlusOne = semiTransparentColors.slice(i + 1, semiTransparentColors.length);
        document.body.append(createReference(sliceUntilEndMinusI));

        // Interleave one opaque color.
        for (const opaqueColor of opaqueColors) {
            document.body.append(createReference([...sliceUntilEndMinusI, opaqueColor]));
            if (sliceFromIPlusOne.length)
                document.body.append(createReference([...sliceUntilI, opaqueColor, ...sliceFromIPlusOne]));
        }

        if (sliceFromIPlusOne.length)
            document.body.append(createReference([...sliceUntilI, ...sliceFromIPlusOne]));
    }
</script>
</body>
chromium/third_party/blink/web_tests/external/wpt/css/css-color/color-layers-no-blend-mode-ref.html
