<!DOCTYPE html> <!-- webkit-test-runner [ AsyncOverflowScrollingEnabled=true ] -->
<html>
<head>
    <style>
        .container {
            width: 150px;
            height: 400px;
            border: 1px solid black;
            padding: 10px;
            margin: 20px;
            overflow-x: scroll;
            scroll-snap-type: y mandatory;
        }

        .box {
            margin: 20px;
            width: 100px;
            height: 100px;
            scroll-snap-align: start;
            background-color: blue;
        }
    </style>
    <script src="../../../resources/js-test.js"></script>
    <script src="../../../resources/ui-helper.js"></script>
    <script>
        jsTestIsAsync = true;
        
        let container = undefined;
        async function runTest()
        {
            let firstScroll = true;
            container = document.getElementById('container');
            container.addEventListener('scroll', () => {
                if (firstScroll) {
                    shouldBeTrue('container.scrollTop > 0');
                    shouldBeTrue('window.internals.isScrollSnapInProgress(container)');
                }
                firstScroll = false;
            });
            
            debug('Scroll-snap offsets for \'container\': ' + window.internals.scrollSnapOffsets(container));

            debug('Initial state:');
            shouldBeFalse('window.internals.isScrollSnapInProgress(container)');

            debug('');
            debug('Sending wheel events');
            await UIHelper.mouseWheelScrollAt(100, 100);

            finishJSTest();
        }

        window.addEventListener('load', () => {
            if (window.testRunner)
                setTimeout(runTest, 0);
        }, false);
    </script>
</head>
<body>
    <div id="container" class="container">
        <div class="contents">
            <div class="box"></div>
            <div class="box"></div>
            <div class="box"></div>
            <div class="box"></div>
            <div class="box"></div>
            <div class="box"></div>
            <div class="box"></div>
            <div class="box"></div>
        </div>
    </div>
    <div id="console"></div>
</body>
</html>