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Automatic update from web-platform-tests Update scroll-margin WPT to stop flakiness Updates test 'external/wpt/css/css-scroll-snap/scroll-margin.html' such that the expected result is consistent. Originally the test's snap areas were equally distant from the scroll position and therefore the area chosen was not consistent. Bug: 964239 Change-Id: I7e8b09719bd526c4e2fb7049131d585ef5e47d8d Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1799387 Reviewed-by: Yi Gu <yigu@chromium.org> Commit-Queue: Kaan Alsan <alsan@google.com> Cr-Commit-Position: refs/heads/master@{#698951} -- wpt-commits: abf6c428d4efa39d5288be0337a26738946b28e4 wpt-pr: 19027
90 lines
2.6 KiB
HTML
90 lines
2.6 KiB
HTML
<!DOCTYPE html>
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<link rel="help" href="https://drafts.csswg.org/css-scroll-snap-1/#scroll-margin" />
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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: 0px;
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}
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#scroller {
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height: 500px;
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width: 500px;
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overflow: hidden;
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scroll-snap-type: both mandatory;
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}
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#target {
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width: 300px;
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height: 300px;
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background-color: blue;
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}
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#another-target {
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width: 300px;
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height: 300px;
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top: 400px;
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left: 400px;
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background-color: blue;
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scroll-snap-align: start;
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}
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</style>
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<div id="scroller">
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<div style="width: 2000px; height: 2000px;"></div>
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<div id="target"></div>
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<div id="another-target"></div>
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</div>
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<script>
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test(() => {
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target.style.scrollSnapAlign = "start";
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target.style.scrollMargin = "100px";
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target.style.left = "300px";
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target.style.top = "300px";
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scroller.scrollTo(0, 0);
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// `target position (300px, 300px)` - `margin (100px, 100px)`.
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assert_equals(scroller.scrollLeft, 200);
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assert_equals(scroller.scrollTop, 200);
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target.style.scrollSnapAlign = "end";
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// `target position (300px, 300px)` + `target size (300px, 300px) +
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// `margin (100px, 100px) - `scroller size (500px, 500px)`.
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scroller.scrollTo(0, 0);
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assert_equals(scroller.scrollLeft, 200);
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assert_equals(scroller.scrollTop, 200);
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}, "Snaps to the positions adjusted by scroll-margin");
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test(() => {
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target.style.left = "0px";
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target.style.top = "0px";
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target.style.scrollSnapAlign = "start";
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// Since the target is at (0px, 0px) in the scroll port, the added margin
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// should not be considered, and the snap points for this snap area should be
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// the closest points in the scroll port (i.e x=0 or y=0).
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target.style.scrollMargin = "200px";
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// Distance from target without margin:
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// `scroll position (150px, 150px)` - `target position (0px, 0px)`
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// = (150px, 150px)
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//
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// Distance from target with margin:
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// `scroll position (150px, 150px)` - [`target position (0px, 0px)` -
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// `target margin (200px, 200px)`]
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// = (350px, 350px)
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//
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// Distance from other target:
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// `other target position (400px, 400px)` - `scroll position (150px, 150px)`
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// = (250px, 250px)
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//
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// Therefore if the "out-of-scrollport" scroll-margin contributes to the
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// calculation, then the other target would be snapped to. However if the
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// scroll-margin is not considered, then the (0px, 0px) target should be
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// snapped to.
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scroller.scrollTo(150, 150);
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assert_equals(scroller.scrollLeft, 0);
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assert_equals(scroller.scrollTop, 0);
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}, "scroll-margin doesn't contribute to the snap position of the element " +
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"if it's outside of the scroll port");
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</script>
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