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121 lines
3.3 KiB
HTML
121 lines
3.3 KiB
HTML
<!DOCTYPE html>
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<title>
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Updating the snap alignment of a snap container's content should make the snap
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container resnap accordingly.
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</title>
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<link rel="help" href="https://drafts.csswg.org/css-scroll-snap/#re-snap" />
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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: 0;
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}
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#scroller {
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height: 200px;
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width: 200px;
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overflow: hidden;
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scroll-snap-type: both mandatory;
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}
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#initial-target {
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width: 300px;
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height: 300px;
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top: 100px;
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left: 100px;
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background-color: green;
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scroll-snap-align: start;
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}
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#other-target {
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width: 300px;
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height: 300px;
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top: 300px;
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left: 300px;
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background-color: red;
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scroll-snap-align: start;
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}
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.area {
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width: 2000px;
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height: 2000px;
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}
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.snap-area {
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scroll-snap-align: start !important;
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}
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</style>
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<div id="scroller">
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<div class="area"></div>
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<div id="initial-target"></div>
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<div id="other-target"></div>
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</div>
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<script>
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const initial_target = document.getElementById("initial-target");
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const other_target = document.getElementById("other-target");
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const scroller = document.getElementById("scroller");
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function cleanup() {
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initial_target.style.setProperty("scroll-snap-align", "start");
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other_target.style.setProperty("scroll-snap-align", "start");
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initial_target.removeAttribute("class");
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}
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test(t => {
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t.add_cleanup(cleanup);
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scroller.scrollTo(0,0);
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assert_equals(scroller.scrollTop, 100);
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assert_equals(scroller.scrollLeft, 100);
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initial_target.style.setProperty("scroll-snap-align", "end");
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// target.top + target.height - scroller.height
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assert_equals(scroller.scrollTop, 200);
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assert_equals(scroller.scrollLeft, 200);
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}, "Changing the current target's snap alignment should make the scroller"
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+ " resnap to it even if another snap position is closer to the current offset");
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test(t => {
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t.add_cleanup(cleanup);
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scroller.scrollTo(0,0);
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assert_equals(scroller.scrollTop, 100);
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assert_equals(scroller.scrollLeft, 100);
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initial_target.style.setProperty("scroll-snap-align", "none");
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assert_equals(scroller.scrollTop, 300);
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assert_equals(scroller.scrollLeft, 300);
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}, "Removing the current target's snap alignment should make the scroller"
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+ " resnap to a new snap area.");
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test(t => {
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t.add_cleanup(cleanup);
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initial_target.style.setProperty("scroll-snap-align", "none");
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other_target.style.setProperty("scroll-snap-align", "none");
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scroller.scrollTo(0,0);
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assert_equals(scroller.scrollTop, 0);
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assert_equals(scroller.scrollLeft, 0);
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initial_target.style.setProperty("scroll-snap-align", "start");
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assert_equals(scroller.scrollTop, 100);
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assert_equals(scroller.scrollLeft, 100);
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}, "Changing an element snap alignment from none to start should make the"
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+ "scroller resnap.");
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test(t => {
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t.add_cleanup(cleanup);
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initial_target.style.setProperty("scroll-snap-align", "none");
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other_target.style.setProperty("scroll-snap-align", "none");
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scroller.scrollTo(0,0);
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assert_equals(scroller.scrollTop, 0);
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assert_equals(scroller.scrollLeft, 0);
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initial_target.classList.add("snap-area");
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assert_equals(scroller.scrollTop, 100);
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assert_equals(scroller.scrollLeft, 100);
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}, "Changing an element snap alignment from none to start by adding a class"
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+ " should make the scroller resnap.");
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</script>
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