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chromium/third_party/blink/web_tests/fast/forms/color-scheme/scrollbar/dynamic-color-scheme-change.html 

<!DOCTYPE html>

<head>
    <meta name="color-scheme" content="light dark">
    <meta name="fuzzy" content="0-10;0-10">
    <script src="../../../../resources/run-after-layout-and-paint.js"></script>
    <script>
        // TODO(wangxianzhu): Direct invalidation of overflow control cc::Layers
        // are not tracked by under-invaldiation checking.
        if (window.internals)
            internals.runtimeFlags.paintUnderInvalidationCheckingEnabled = false;

        function endTest() {
            if (window.testRunner)
                testRunner.notifyDone();
        }

        function doTest() {
            window.internals.setForcedColorsAndDarkPreferredColorScheme(document);
            runAfterLayoutAndPaint(endTest);
        }

        runAfterLayoutAndPaint(doTest);

        if (window.testRunner)
            testRunner.waitUntilDone();
    </script>
</head>

<body style="height:5000px; width:5000px">
    <div style="width: 200px; height: 150px; overflow: scroll; background: white">
        <div style="height: 1000px; width: 1000px"></div>
    </div>
    <div style="width: 200px; height: 150px; overflow: scroll">
        <div style="height: 1000px; width: 1000px"></div>
    </div>
    <div style="width: 200px; height: 150px; overflow: scroll; will-change: scroll-position">
        <div style="height: 1000px; width: 1000px"></div>
    </div>
</body>