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69 lines
1.5 KiB
HTML
69 lines
1.5 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 x-axis 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: x 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-visible {
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left: 0px;
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top: 0px;
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}
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#right-visible {
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left: 800px;
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top: 0px;
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}
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#middle-margin-visible {
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left: 700px;
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top: 800px;
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/* 300px makes snap area visible with margin but non-visible without it */
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scroll-margin-top: 300px;
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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-visible" class="snap"></div>
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<div id="middle-margin-visible" class="snap"></div>
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<div id="right-visible" 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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scroller.scrollTo(500, 0);
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assert_equals(scroller.scrollLeft, 700);
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assert_equals(scroller.scrollTop, 0);
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}, 'Scroll margin should be considered when calculating snap area visibilty \
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while snapping on the x-axis');
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</script>
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