88 lines
2.7 KiB
HTML
88 lines
2.7 KiB
HTML
<!DOCTYPE html>
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<title>
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A test case that scrolling to a point on large element where the snap area
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doesn't cover over the snapport
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</title>
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<link rel="help" href="https://drafts.csswg.org/css-scroll-snap-1/#snap-overflow"/>
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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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width: 100%;
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}
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#scroller {
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left: 10px;
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height: 200px;
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width: 100px;
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overflow-y: scroll;
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overflow-x: hidden;
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scroll-snap-type: y mandatory;
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}
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.snap {
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scroll-snap-align: start;
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background-color: green;
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}
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.target {
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background-color: red;
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border-radius: 100%;
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height: 88px;
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top: 536px;
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}
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</style>
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<div id="scroller">
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<div style="height: 2000px;"></div>
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<div class="snap" style="top: 0px; height: 40px;">1</div>
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<div class="snap" style="top: 40px; height: 40px;">2</div>
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<div class="snap" style="top: 80px; height: 1000px;">3</div>
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<div class="snap" style="top: 1080px; height: 40px;">4</div>
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<div class="snap" style="top: 1120px; height: 40px;">5</div>
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<div class="target"></div>
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</div>
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<script>
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test(() => {
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const scroller = document.getElementById("scroller");
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scroller.scrollBy(0, 10);
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// Snap to the first snap point.
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assert_equals(scroller.scrollLeft, 0);
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assert_equals(scroller.scrollTop, 40);
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scroller.scrollBy(0, 10);
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// Snap to the second snap point.
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assert_equals(scroller.scrollLeft, 0);
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assert_equals(scroller.scrollTop, 80);
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scroller.scrollBy(0, 100);
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// Snap to the given scrolling position since the third snap target element
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// is larger than the snapport.
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assert_equals(scroller.scrollLeft, 0);
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assert_equals(scroller.scrollTop, 180);
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scroller.scrollBy(0, 100);
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// Again, snap to the given scrolling position.
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assert_equals(scroller.scrollLeft, 0);
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assert_equals(scroller.scrollTop, 280);
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// Scroll to a point where the third target element is still covering over the
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// snapport.
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scroller.scrollBy(0, 600);
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assert_equals(scroller.scrollLeft, 0);
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// Again, snap to the given scrolling position.
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assert_equals(scroller.scrollTop, 880);
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// Scroll to a point where the third target element is no longer convering
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// over the snapport, rather the forth snap point is in the snapport.
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scroller.scrollBy(0, 10);
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// Now, snap to the forth snap point.
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assert_equals(scroller.scrollLeft, 0);
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assert_equals(scroller.scrollTop, 1080);
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// Scroll back a bit.
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scroller.scrollBy(0, -10);
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// This should snap to the bottom of the 3rd snap area and not all the way
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// back up to its top.
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assert_equals(scroller.scrollLeft, 0);
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assert_equals(scroller.scrollTop, 880);
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}, "snaps to bottom edge of large snap area that doesn't cover the snap port.");
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</script>
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