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Automatic update from web-platform-testsSnap Point selection should satisfy visibility requirement. According to spec, https://www.w3.org/TR/css-scroll-snap-1/#snap-scope we should only consider the snap points of visible snap areas. This patch implements the visibility requirement by adding a field of visible region for each snap point. It also handles the case of visibility conflict when snapping to two axes individually. Bug: 778257 Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.android:android_optional_gpu_tests_rel Change-Id: I7a3d2aa6b9c1293df3f05118152f105fa3265d29 Reviewed-on: https://chromium-review.googlesource.com/814874 Commit-Queue: Sandra Sun <sunyunjia@chromium.org> Reviewed-by: Jeremy Roman <jbroman@chromium.org> Reviewed-by: Ali Juma <ajuma@chromium.org> Reviewed-by: Majid Valipour <majidvp@chromium.org> Cr-Commit-Position: refs/heads/master@{#543111} wpt-commits: 343fd25cd72c64ed30da54b650220cca7338cd57 wpt-pr: 9821 wpt-commits: 343fd25cd72c64ed30da54b650220cca7338cd57 wpt-pr: 9821
70 lines
1.5 KiB
HTML
70 lines
1.5 KiB
HTML
<!DOCTYPE html>
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<link rel="help" href="https://drafts.csswg.org/css-scroll-snap-1" />
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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: 600px;
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width: 600px;
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overflow: scroll;
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scroll-snap-type: both mandatory;
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}
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#space {
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width: 2000px;
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height: 2000px;
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}
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.snap {
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width: 200px;
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height: 200px;
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background-color: blue;
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scroll-snap-align: start;
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}
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#left-top {
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left: 0px;
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top: 0px;
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}
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#right-top {
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left: 800px;
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top: 0px;
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}
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#left-bottom {
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left: 0px;
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top: 800px;
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}
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</style>
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<div id="scroller">
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<div id="space"></div>
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<div id="left-top" class="snap"></div>
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<div id="right-top" class="snap"></div>
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<div id="left-bottom" class="snap"></div>
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</div>
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<script>
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var scroller = document.getElementById("scroller");
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test(() => {
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scroller.scrollTo(0, 0);
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assert_equals(scroller.scrollLeft, 0);
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assert_equals(scroller.scrollTop, 0);
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scroller.scrollTo(300, 0);
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assert_equals(scroller.scrollLeft, 800);
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assert_equals(scroller.scrollTop, 0);
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}, 'Only snap to visible area on X axis, even when the non-visible ones are closer');
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test(() => {
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scroller.scrollTo(0, 0);
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assert_equals(scroller.scrollLeft, 0);
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assert_equals(scroller.scrollTop, 0);
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scroller.scrollTo(0, 300);
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assert_equals(scroller.scrollLeft, 0);
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assert_equals(scroller.scrollTop, 800);
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}, 'Only snap to visible area on Y axis, even when the non-visible ones are closer');
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</script>
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