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60 lines
1.6 KiB
HTML
60 lines
1.6 KiB
HTML
<!DOCTYPE html>
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<link rel="help" href="https://drafts.csswg.org/css-scroll-snap-1/#valdef-scroll-snap-type-mandatory" />
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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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}
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.child {
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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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</style>
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<div id="scroller">
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<div class="child" style="top: 0px; left: 0px;"></div>
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<div class="child" style="top: 1000px; left: 1000px;"></div>
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<div style="width: 2000px; height: 2000px;"></div>
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</div>
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<script>
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test(() => {
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scroller.scrollSnapType = "both mandatory";
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// Scroll to where the first child is in view.
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scroller.scrollTo(100, 100);
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assert_equals(scroller.scrollLeft, 100);
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assert_equals(scroller.scrollTop, 100);
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// Scroll to where the second child is in view.
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scroller.scrollTo(900, 900);
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assert_equals(scroller.scrollLeft, 900);
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assert_equals(scroller.scrollTop, 900);
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}, "No snapping occurs if there is no valid snap position");
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test(() => {
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scroller.scrollSnapType = "x mandatory";
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for (const target of document.querySelectorAll(".child")) {
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target.scrollSnapAlign = "start none";
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}
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// Scroll to where the first child is in view.
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scroller.scrollTo(100, 100);
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assert_equals(scroller.scrollLeft, 100);
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assert_equals(scroller.scrollTop, 100);
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// Scroll to where the second child is in view.
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scroller.scrollTo(900, 900);
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assert_equals(scroller.scrollLeft, 900);
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assert_equals(scroller.scrollTop, 900);
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}, "No snapping occurs if there is no valid snap position matches scroll-snap-type");
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</script>
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