92 lines
3.1 KiB
HTML
92 lines
3.1 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<title>Noop smooth scrolls don't interrupt ongoing smooth scrolls</title>
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<meta name="viewport" content="width=device-width,minimum-scale=1,initial-scale=1">
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<link rel="help" href="https://drafts.csswg.org/cssom-view/#concept-smooth-scroll">
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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="/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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.scroller {
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height: 200px;
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width: 200px;
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border: solid 1px black;
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background-color: teal;
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overflow-y: scroll;
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overflow-x: hidden;
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position: relative;
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}
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.box {
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height: 50px;
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width: 50px;
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background-color: purple;
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margin-top: 400px;
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}
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.space {
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position: absolute;
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height: 200vh;
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width: 200vw;
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}
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</style>
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<div id="scroller" class="scroller">
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<div class="space"></div>
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<div id="box" class="box"></div>
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</div>
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<script>
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const scroller = document.getElementById("scroller");
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const box = document.getElementById("box");
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async function test_smooth_scroll_nonstop(test, scroll_function, target_offset) {
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await waitForScrollReset(test, scroller);
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await waitForCompositorCommit(test, scroller);
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const scrollend_promise = waitForScrollEndFallbackToDelayWithoutScrollEvent(scroller);
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const MAX_NO_MOVE_DURATION_MS = 1000;
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let resolve_stuck_promise = null;
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const stuck_promise = new Promise((resolve) => {
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resolve_stuck_promise = resolve;
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});
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let last_observed_offset = scroller.scrollTop;
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let last_update_time = performance.now;
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function run_scroll_function() {
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if (scroller.scrollTop != last_observed_offset) {
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last_update_time = performance.now();
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last_observed_offset = scroller.scrollTop;
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} else {
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if (performance.now() - last_update_time > MAX_NO_MOVE_DURATION_MS) {
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resolve_stuck_promise();
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}
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}
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scroll_function();
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}
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// Run the scroll function repeatedly.
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const id = setInterval(run_scroll_function);
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await Promise.any([scrollend_promise, stuck_promise]);
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clearInterval(id);
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assert_equals(scroller.scrollTop, target_offset,
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"scroller reached the target offset");
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}
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promise_test(async (t) => {
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const target_offset = box.offsetTop;
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const scroll_function = () => {
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scroller.scrollTo({ top: target_offset, behavior: "smooth" });
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}
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await test_smooth_scroll_nonstop(test, scroll_function, target_offset);
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}, "noop scrollTo doesn't interrupt ongoing smooth scroll.");
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promise_test(async (t) => {
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const target_offset = box.offsetTop;
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const scroll_function = () => {
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box.scrollIntoView({ block: "start", behavior: "smooth" });
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}
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await test_smooth_scroll_nonstop(test, scroll_function, target_offset);
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}, "noop scrollIntoView doesn't interrupt ongoing smooth scroll.");
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</script>
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</body>
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</html>
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