74 lines
2.6 KiB
HTML
74 lines
2.6 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<title>Fling within a large target is not interrupted by scroll snap</title>
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<link rel="help" href="https://drafts.csswg.org/css-scroll-snap/"/>
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<script src="/resources/testdriver.js"></script>
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<script src="/resources/testdriver-actions.js"></script>
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<script src="/resources/testdriver-vendor.js"></script>
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<script src="/dom/events/scrolling/scroll_support.js"></script>
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</head>
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<body>
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<style>
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main {
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scroll-snap-type: y;
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overflow: auto;
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height: 100vh;
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}
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div {
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scroll-snap-align: start;
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width: 80vw;
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height: 800vh;
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background: yellow;
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border: solid black 3px;
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}
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</style>
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<main id="scroller">
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<div></div>
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</main>
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<script>
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promise_test(async (t) => {
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await waitForCompositorReady();
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const scroller = document.getElementById("scroller");
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assert_equals(scroller.scrollTop, 0, "scroller not initially scrolled");
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let initial_scroll_top = scroller.scrollTop;
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let last_scroll_top = initial_scroll_top;
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const scroll_listener = () => {
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assert_greater_than_equal(scroller.scrollTop, last_scroll_top,
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"fling did not move backwards.");
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last_scroll_top = scroller.scrollTop;
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}
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scroller.addEventListener("scroll", scroll_listener);
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// We expect pointercancel to be triggered when scrolling starts due to
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// the touch-fling. If we instead get a pointerup event, we know that
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// scrolling isn't happening and we can immediately fail the test instead
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// of waiting for a timeout.
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const pointer_promise = () => {
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return new Promise((resolve, reject) => {
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document.addEventListener("pointerup", reject, { once: true });
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document.addEventListener("pointercancel", resolve, { once: true });
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});
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};
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try {
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const scrollend_promise = waitForScrollendEventNoTimeout(scroller);
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await touchFlingInTarget(/*pixels_to_scroll*/100, scroller, "down");
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await pointer_promise;
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await scrollend_promise;
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} catch(e) {
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assert_unreached("Failed to trigger touch fling.");
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}
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assert_greater_than(last_scroll_top, initial_scroll_top,
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"received at least one scroll update.");
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assert_greater_than_equal(scroller.scrollTop, last_scroll_top,
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"fling did not move backwards at the end of the scroll.");
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}, "fling within a large area is not interrupted by scroll snap");
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</script>
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</body>
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</html>
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