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86 lines
2 KiB
HTML
86 lines
2 KiB
HTML
<!DOCTYPE html>
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<link rel="help" href="https://drafts.csswg.org/css-scroll-snap-1" />
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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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#right-top {
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left: 800px;
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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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}
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#right-bottom {
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left: 1800px;
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top: 1800px;
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scroll-margin-top: 1000px;
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scroll-margin-left: 1000px;
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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="right-top" class="snap"></div>
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<div id="left-bottom" class="snap"></div>
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<div id="right-bottom" class="snap"></div>
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</div>
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<script>
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var scroller = document.getElementById("scroller");
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test(() => {
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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(300, 0);
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assert_equals(scroller.scrollLeft, 800);
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assert_equals(scroller.scrollTop, 0);
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}, 'Only snap to visible area on X axis, even when the non-visible ones are closer');
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test(() => {
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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(0, 300);
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assert_equals(scroller.scrollLeft, 0);
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assert_equals(scroller.scrollTop, 800);
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}, 'Only snap to visible area on Y axis, even when the non-visible ones are closer');
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test(() => {
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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(300, 300);
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assert_equals(scroller.scrollLeft, 800);
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assert_equals(scroller.scrollTop, 800);
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}, 'snap to snap area inflated by scroll-margin, even when the non-visible ones are closer');
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</script>
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