LayoutTests/fast/scrolling/mac/keyboard-scrolling-with-mouse-scroll.html

<!DOCTYPE html> <!-- webkit-test-runner [ useFlexibleViewport=true EventHandlerDrivenSmoothKeyboardScrollingEnabled=true ] -->

<html>

<head>
    <script src="../../../resources/ui-helper.js"></script>
    <script src="../../../resources/js-test.js"></script>
    <meta name="viewport" content="initial-scale=1.5, user-scalable=no">
    <script>
        if (window.testRunner) {
            testRunner.dumpAsText();
            testRunner.waitUntilDone();
        }
        
        async function runTest()
        {
            eventSender.monitorWheelEvents();
            if (!window.testRunner || !testRunner.runUIScript)
                return;

            await UIHelper.rawKeyDown("downArrow");
            
            setTimeout(async () => {
                await UIHelper.rawKeyUp("downArrow");
                const startingPosition = window.scrollY;

                await UIHelper.mouseWheelScrollAt(0, 0, 0, 0, 0, 0);

                const position = window.scrollY;
                if (Math.abs(startingPosition - position) < 20)
                    debug("Successful.");
                else
                    debug("Unsuccessful. window.scrollY after wheel event == " + position + "; window.scrollY before wheel event == " + startingPosition);

                testRunner.notifyDone();
            }, 100);
        }
    </script>
</head>

<body onload="runTest()">
    <div style="height: 5000px;">
    </div>
</body>

</html>