54 lines
1.5 KiB
HTML
54 lines
1.5 KiB
HTML
<!DOCTYPE html>
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<link rel="help" href="https://drafts.csswg.org/css-scroll-snap/#re-snap" />
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<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1948861">
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<style>
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#scroller {
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scroll-snap-type: y mandatory;
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width: 500px;
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height: 200px;
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overflow-y: scroll;
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overflow-x: hidden;
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scrollbar-width: none;
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}
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.child {
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scroll-snap-align: start;
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width: 500px;
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height: 100%;
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}
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video {
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height: 100%;
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}
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</style>
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<div id="container">
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<div id="scroller">
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<div class="child">
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<video src="dummy.webm" controls autoplay>
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</div>
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<div class="child">
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<video src="dummy.webm" controls autoplay>
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</div>
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<div class="child">
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<video src="dummy.webm" controls autoplay>
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</div>
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</div>
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</div>
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<script>
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promise_test(async () => {
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assert_equals(scroller.scrollTop, 0);
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const scrollendPromise = new Promise(resolve => {
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scroller.addEventListener("scrollend", resolve);
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});
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// Try to scroll downward, it will snap to the second green box.
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scroller.scrollBy({ top: 100, behavior: "smooth" });
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await scrollendPromise;
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// Change the parent position style so that the scroll container will
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// be reconstructed.
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container.style.position = "fixed";
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assert_equals(scroller.scrollTop, 200, "Should stay at the last snap point");
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}, "Stay at the last snap point even after reconstrucing the scroll container");
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</script>
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