91 lines
2.2 KiB
HTML
91 lines
2.2 KiB
HTML
<!DOCTYPE html>
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<title>
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The scroller should try to resnap to targets for both axes if possible.
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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: 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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#x-axis-target {
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scroll-snap-align: none start;
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background-color: blue;
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width: 100px;
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height: 100px;
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top: 400px;
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left: 200px;
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}
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#y-axis-target {
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scroll-snap-align: start none;
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background-color: green;
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width: 100px;
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height: 100px;
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top: 200px;
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left: 400px;
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}
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#far-x-axis-target {
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scroll-snap-align: none start;
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background-color: blue;
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width: 100px;
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height: 100px;
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top: 1200px;
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left: 300px;
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}
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#far-y-axis-target {
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scroll-snap-align: start none;
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background-color: green;
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width: 100px;
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height: 100px;
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top: 300px;
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left: 1200px;
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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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</style>
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<div id="scroller">
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<div class="area"></div>
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<div id="x-axis-target"></div>
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<div id="y-axis-target"></div>
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<div id="far-x-axis-target"></div>
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<div id="far-y-axis-target"></div>
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</div>
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<script>
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const x_target = document.getElementById("x-axis-target");
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const y_target = document.getElementById("y-axis-target");
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const scroller = document.getElementById("scroller");
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test(t => {
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// The scroller should be snapped to the two closest points on first layout.
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assert_equals(scroller.scrollTop, 200);
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assert_equals(scroller.scrollLeft, 200);
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x_target.style.setProperty("left", "1000px");
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y_target.style.setProperty("top", "1000px");
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// The style change makes it impossible for the scroller to snap to both
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// targets, but at least one of the targets should be preserved. The scroller
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// should then re-evaluate the snap point for the other axis.
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const snapped_to_x = scroller.scrollLeft == 1000 && scroller.scrollTop == 300;
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const snapped_to_y = scroller.scrollTop == 1000 && scroller.scrollLeft == 300;
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assert_true(snapped_to_x || snapped_to_y);
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}, "Scroller should snap to at least one of the targets if unable to snap to both after a layout change.");
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</script>
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