chromium/third_party/blink/web_tests/external/wpt/css/css-pseudo/marker-variable-computed-style.html

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8" />
    <link rel="author" title="Karl Dubost" href="https://github.com/karlcow" />
    <link rel="help" href="https://drafts.csswg.org/css-pseudo/#marker-pseudo" />
    <link rel="help" href="https://drafts.csswg.org/css-variables/#defining-variables" />
    <script src="/resources/testharness.js"></script>
    <script src="/resources/testharnessreport.js"></script>
    <title>::marker with variables</title>
    <style>
        .firstTest::marker {
            --alpha: 0.75;
            color: rgba(0 128 0 / var(--alpha));
        }

        .secondTest::marker {
            --color: rgb(0 128 0);
            color: var(--color);
        }
    </style>
</head>

<body>
    <ul>
        <li class="firstTest">Item 1</li>
        <li class="secondTest">Item 2</li>
    </ul>
    <script>
        test(() => {
            let firstTest = document.querySelector('.firstTest');
            let markerStyle = getComputedStyle(firstTest, '::marker');
            assert_equals(markerStyle.color, "rgba(0, 128, 0, 0.75)", "color is green with 0.75 opacity.");
        }, `getComputedStyle() for opacity defined by variable in ::marker`);
        test(() => {
            let secondTest = document.querySelector('.secondTest');
            let markerStyle = getComputedStyle(secondTest, '::marker');
            assert_equals(markerStyle.color, "rgb(0, 128, 0)", "color is green.");
        }, `getComputedStyle() for color defined by variable in ::marker`);
    </script>
</body>

</html>