66 lines
1.8 KiB
HTML
66 lines
1.8 KiB
HTML
<!DOCTYPE html>
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<title>
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Not re-snap once after a scroll operation has finished without snapping
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because the scroll destination was outside of the snap proximity threshold.
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</title>
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<!-- This test assumes that all major browsers' default scroll-snap proximity
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thresholds are greater than 200px. -->
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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=1780154">
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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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div {
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position: absolute;
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margin: 0;
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}
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#scroller {
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height: 600px;
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width: 600px;
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overflow: hidden;
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scroll-snap-type: y proximity;
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}
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.snap {
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width: 300px;
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height: 300px;
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background-color: green;
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scroll-snap-align: start;
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}
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.area {
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width: 2000px;
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height: 2000px;
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}
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</style>
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<div id="scroller">
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<div class="area"></div>
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<div class="snap" style="top: 0px;"></div>
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<div class="snap" style="top: 500px;"></div>
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</div>
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<script>
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test(() => {
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// The initial snap position is at (0, 0).
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assert_equals(scroller.scrollTop, 0);
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assert_equals(scroller.scrollLeft, 0);
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// Scroll to a position where it's outside of the scroll-snap proximity
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// threshold, so that it won't trigger snapping.
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scroller.scrollTo(0, 250);
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assert_equals(scroller.scrollTop, 250);
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assert_equals(scroller.scrollLeft, 0);
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// Changing the initial snap target position, but still it's outside of the
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// threshold.
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document.querySelectorAll(".snap")[0].style.top = "10px";
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// Not re-snap to the last snap point.
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assert_equals(scroller.scrollTop, 250);
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assert_equals(scroller.scrollLeft, 0);
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}, "Not re-snap once after a scroll operation has finished without snapping " +
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"because the scroll destination was outside of the snap proximity threshold.");
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</script>
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