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115 lines
3.6 KiB
HTML
115 lines
3.6 KiB
HTML
<!DOCTYPE html>
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<link rel="help" href="https://drafts.csswg.org/css-scroll-snap-1/#scroll-snap-type" />
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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: 400px;
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height: 350px;
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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: 1000px;
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height: 1000px;
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}
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#target {
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width: 200px;
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height: 200px;
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left: 300px;
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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="target"></div>
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</div>
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<script>
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const scroller_width = scroller.clientWidth;
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const scroller_height = scroller.clientHeight;
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[
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["horizontal-tb", 300, 500 - scroller_height],
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["vertical-lr", 500 - scroller_width, 300],
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["vertical-rl", scroller_width - 700, 300]
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].forEach(([writing_mode, left, top]) => {
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test(() => {
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const target_left = getComputedStyle(target).left;
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scroller.style.writingMode = writing_mode;
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target.style.scrollSnapAlign = "end start";
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if (writing_mode == "vertical-rl") {
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target.style.left = (scroller_width - 700) + "px";
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scroller.scrollTo(-500, 0);
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} else {
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scroller.scrollTo(0, 0);
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}
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assert_equals(scroller.scrollLeft, left, "aligns correctly on x");
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assert_equals(scroller.scrollTop, top, "aligns correctly on y");
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target.style.left = target_left;
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scroller.style.writingMode = "";
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}, "Snaps correctly for " + writing_mode +
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" writing mode with 'scroll-snap-align: end start' alignment");
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});
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[
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["horizontal-tb", 500 - scroller_width, 300],
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["vertical-lr", 300, 500 - scroller_height],
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["vertical-rl", target.clientWidth - 700, 500 - scroller_height]
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].forEach(([writing_mode, left, top]) => {
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test(() => {
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const target_left = getComputedStyle(target).left;
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scroller.style.writingMode = writing_mode;
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target.style.scrollSnapAlign = "start end";
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if (writing_mode == "vertical-rl") {
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target.style.left = (scroller_width - 700) + "px";
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scroller.scrollTo(-500, 0);
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} else {
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scroller.scrollTo(0, 0);
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}
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assert_equals(scroller.scrollLeft, left, "aligns correctly on x");
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assert_equals(scroller.scrollTop, top, "aligns correctly on y");
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target.style.left = target_left;
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scroller.style.writingMode = "";
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}, "Snaps correctly for " + writing_mode +
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" writing mode with 'scroll-snap-align: start end' alignment");
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});
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test(() => {
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const target_left = getComputedStyle(target).left;
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scroller.style.direction = "rtl";
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target.style.scrollSnapAlign = "end start";
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target.style.left = (scroller_width - 700) + "px";
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scroller.scrollTo(-500, 0);
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assert_equals(scroller.scrollLeft, target.clientWidth - 700,
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"aligns correctly on x");
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assert_equals(scroller.scrollTop, 500 - scroller_height,
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"aligns correctly on y");
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target.style.left = target_left;
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scroller.style.direction = "";
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}, "Snaps correctly for 'direction: rtl' with 'scroll-snap-align: end start' " +
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"alignment");
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test(() => {
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const target_left = getComputedStyle(target).left;
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scroller.style.direction = "rtl";
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target.style.scrollSnapAlign = "start end";
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target.style.left = (scroller_width - 700) + "px";
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scroller.scrollTo(-500, 0);
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assert_equals(scroller.scrollLeft, scroller_width - 700,
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"aligns correctly on x");
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assert_equals(scroller.scrollTop, 300, "aligns correctly on y");
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target.style.left = target_left;
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scroller.style.direction = "";
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}, "Snaps correctly for 'direction: rtl' with 'scroll-snap-align: start end' " +
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"alignment");
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</script>
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