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48 lines
1.5 KiB
HTML
48 lines
1.5 KiB
HTML
<!DOCTYPE html>
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<title>`intended direction` scroll snaps only at points ahead of the scroll direction</title>
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<link rel="help" href="https://drafts.csswg.org/css-scroll-snap-1/#scroll-snap-type" />
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<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1766805">
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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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width: 200px;
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height: 100px;
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overflow: scroll;
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scroll-snap-type: x mandatory;
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}
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.snap {
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scroll-snap-align: start;
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background: green;
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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: 100px;"></div>
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<div class="snap" style="left: 0px; width: 20px; height: 100px;">1</div>
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<div class="snap" style="left: 100px; width: 20px; height: 100px;">2</div>
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<div class="snap" style="left: 120px; width: 20px; height: 100px;">3</div>
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<div class="snap" style="left: 300px; width: 20px; height: 100px;">4</div>
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<div class="snap" style="left: 400px; width: 20px; height: 100px;">5</div>
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</div>
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<script>
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test(() => {
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scroller.scrollBy(10, 0);
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assert_equals(scroller.scrollLeft, 100);
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scroller.scrollBy(10, 0);
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assert_equals(scroller.scrollLeft, 120);
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scroller.scrollBy(10, 0);
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// Snaps to the next snap point even if the previous snap point is closer to
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// the current position.
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assert_equals(scroller.scrollLeft, 300);
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}, "`intended direction` scroll snaps only at points ahead of the scroll " +
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"direction");
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</script>
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