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73 lines
2 KiB
HTML
73 lines
2 KiB
HTML
<!DOCTYPE html>
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<link rel="help" href="https://drafts.csswg.org/css-scroll-snap-1/#scroll-margin" />
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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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scroll-snap-type: both mandatory;
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}
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#target {
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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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#another-target {
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width: 300px;
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height: 300px;
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top: 400px;
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left: 400px;
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background-color: blue;
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scroll-snap-align: start;
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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: 2000px;"></div>
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<div id="target"></div>
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<div id="another-target"></div>
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</div>
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<script>
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test(() => {
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target.style.scrollSnapAlign = "start";
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target.style.scrollMargin = "100px";
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target.style.left = "300px";
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target.style.top = "300px";
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scroller.scrollTo(0, 0);
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// `target position (300px, 300px)` - `margin (100px, 100px)`.
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assert_equals(scroller.scrollLeft, 200);
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assert_equals(scroller.scrollTop, 200);
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target.style.scrollSnapAlign = "end";
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// `target position (300px, 300px)` + `target size (300px, 300px) +
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// `margin (100px, 100px) - `scroller size (500px, 500px)`.
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scroller.scrollTo(0, 0);
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assert_equals(scroller.scrollLeft, 200);
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assert_equals(scroller.scrollTop, 200);
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}, "Snaps to the positions adjusted by scroll-margin");
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test(() => {
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target.style.left = "0px";
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target.style.top = "0px";
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target.style.scrollSnapAlign = "start";
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target.style.scrollMargin = "100px";
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// Scroll to the position between #target and #another-target elements but
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// if the scroll-margin 100px contributed to the snap start-aligned snap
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// position it will be farther than #another-target.
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scroller.scrollTo(200, 200);
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assert_equals(scroller.scrollLeft, 0);
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assert_equals(scroller.scrollTop, 0);
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}, "scroll-margin doesn't contribute to the snap position of the element " +
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"if it's outside of the scroll port");
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</script>
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