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chromium/third_party/blink/web_tests/fast/forms/color-scheme/href/href-appearance-basic.html 

<!DOCTYPE html>

<head>
    <meta name="color-scheme" content="light dark">
</head>

<body>
    <ul>
        <li><a href="#" id="website1">Website</a></li>
        <li><a href="#" id="website2">Website - Active</a></li>
    </ul>
</body>

<script>
    var website2 = document.getElementById("website2");

    var mouseX = website2.offsetLeft;
    var mouseY = website2.offsetTop;
    eventSender.mouseMoveTo(mouseX, mouseY);
    eventSender.mouseDown();
</script>