<!DOCTYPE html> <!-- webkit-test-runner [ internal:AsyncOverflowScrollingEnabled=true ] -->
<html>
<head>
    <style>
        body {
            height: 1000px;
        }
        
        .scroller {
            width: 200px;
            height: 200px;
            overflow: scroll;
            border: 1px solid black;
        }
        
        .contents {
            width: 100%;
            height: 300%;
        }
        
    </style>
    <script src="../../../resources/js-test-pre.js"></script>
    <script src="../../../resources/ui-helper.js"></script>
    <script>
        jsTestIsAsync = true;

        var overflow;
        async function scrollTest()
        {
            overflow = document.querySelector('.scroller');

            shouldBe('overflow.scrollTop', '0');
            shouldBe('window.pageYOffset', '0');

            if (!window.eventSender) {
                finishJSTest();
                return;
            }

            await UIHelper.mouseWheelScrollAt(100, 100, 0, 0, 0, -20);

            debug('After scroll');
            shouldBe('overflow.scrollTop', '200');
            shouldBe('window.pageYOffset', '0');

            finishJSTest();
        }

        window.addEventListener('load', () => {
            description("Tests a gesture with zero delta on the began event doesn't latch on the document");
            setTimeout(scrollTest, 0);
        }, false);
    </script>
</head>
<body>
    <div class="scroller">
        <div class="contents"></div>
    </div>
<div id="console"></div>
<script src="../../../resources/js-test-post.js"></script>
</body>
</html>