80 lines
2 KiB
HTML
80 lines
2 KiB
HTML
<!DOCTYPE html>
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<title>
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Snap to an area where the element's scroll-margin is visible but not the
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element itself (using both axes snap type)
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</title>
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<link rel="help" href="https://drafts.csswg.org/css-scroll-snap-1/#snap-scope"/>
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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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#left-bottom {
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left: 0px;
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top: 800px;
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/* 800px scroll-margin makes the snap area span to the right end of the
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right-top area */
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scroll-margin-right: 800px;
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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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/* 800px scroll-margin makes the snap area span to the bottom end of the
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left-bottom area */
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scroll-margin-bottom: 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="left-bottom" class="snap"></div>
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<div id="right-top" class="snap"></div>
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</div>
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<script>
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test(() => {
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const scroller = document.getElementById("scroller");
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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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// 750 and 650 are picked as those are closer to top left of the intersection
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// (800, 800) of the snap areas where the browser should snap. This makes the
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// intersection a closer snap option than a covering option that the browser
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// might choose where the snapport is aligned on the bottom and right.
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scroller.scrollTo(650, 750);
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assert_equals(scroller.scrollLeft, 800);
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assert_equals(scroller.scrollTop, 800);
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scroller.scrollTo(750, 650);
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assert_equals(scroller.scrollLeft, 800);
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assert_equals(scroller.scrollTop, 800);
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}, 'Snap to area such that only the scroll margin from both axes\' areas are \
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visible');
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</script>
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