<!DOCTYPE html> <!-- webkit-test-runner [ useFlexibleViewport=true AsyncOverflowScrollingEnabled=true ] -->
<html>
<meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no">
<head>
    <script src="../../../../resources/js-test.js"></script>
    <script src="../../../../resources/ui-helper.js"></script>
    <style>
    html, body {
        width: 100%;
        height: 100%;
        margin: 0;
    }

    #scroller {
        overflow: scroll;
        width: 200px;
        height: 200px;
        border: 2px solid black;
    }

    #content {
        width: 100%;
        height: 1000px;
    }
    </style>
    <script>
        jsTestIsAsync = true;

        async function runTest() {
            description("Verifies that calling preventDefault() on touchstart prevents scrolling when the touch event handler is unresponsive for an extended duration. To manually test, attempt to scroll the box; check that touchstart and touchend events were handled, and that the box did not scroll.");

            const scroller = document.getElementById("scroller");

            scroller.addEventListener("touchstart", event => {
                const startTime = Date.now();
                while (1) {
                    if (Date.now() - startTime > 400)
                        break;
                }
                testPassed("Observed touchstart event");
                event.preventDefault();
            });

            scroller.addEventListener("touchend", () => {
                testPassed("Observed touchend event");
                finishJSTest();
            });
            scroller.addEventListener("scroll", () => testFailed("Observed scroll event"), { once : true });

            if (!window.testRunner)
                return;

            const eventStreamData = new UIHelper.EventStreamBuilder()
                .begin(100, 190)
                .move(100, 10, 1)
                .move(100, 190, 1)
                .move(100, 100, 0.5)
                .end()
                .takeResult();

            await UIHelper.sendEventStream(eventStreamData);
        }

        addEventListener("load", runTest);
    </script>
</head>
<body>
    <div id="scroller">
        <div id="content"></div>
    </div>
    <pre id="description"></pre>
    <pre id="console"></pre>
</body>
</html>