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104 lines
3.3 KiB
HTML
104 lines
3.3 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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<meta name="viewport" content="user-scalable=no">
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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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}
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:root {
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overflow: scroll;
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scroll-snap-type: both mandatory;
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}
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.scroller {
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overflow: scroll;
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scroll-snap-type: both mandatory;
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padding: 0px;
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}
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#outer {
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left: 1000px;
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top: 1000px;
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width: 600px;
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height: 600px;
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}
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#out-snap-1 {
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scroll-snap-align: start;
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left: 1200px;
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top: 1200px;
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width: 10px;
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height: 10px;
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}
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#out-snap-2 {
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scroll-snap-align: start;
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left: 1100px;
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top: 1100px;
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width: 10px;
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height: 10px;
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}
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#inner {
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left: 1000px;
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top: 1000px;
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width: 400px;
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height: 400px;
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}
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.space {
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left: 0px;
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top: 0px;
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width: 3000px;
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height: 3000px;
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}
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#target {
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scroll-snap-align: end;
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left: 800px;
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top: 800px;
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width: 200px;
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height: 200px;
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}
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</style>
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<div class="space"></div>
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<div id="out-snap-1"></div>
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<div id="out-snap-2"></div>
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<div class="scroller" id="outer">
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<div class="space"></div>
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<div class="scroller" id="inner">
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<div class="space"></div>
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<div id="target"></div>
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</div>
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</div>
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<script>
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var outer = document.getElementById("outer");
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var inner = document.getElementById("inner");
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var target = document.getElementById("target");
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test(() => {
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// Initial layout triggers a scroll snap. Reset position before calling
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// scrollIntoView.
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window.scrollTo(0, 0);
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outer.scrollTo(0, 0);
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inner.scrollTo(0, 0);
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target.scrollIntoView({inline: "start", block: "start"});
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// Although the scrollIntoView specified "start" as the alignment, the target
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// has "end" as its snap-alignment. So the inner scroller finishes with "end"
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// alignment
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assert_equals(inner.scrollLeft, 1000 - inner.clientWidth, "ScrollIntoView lands on the target's snap position regardless of the specified alignment.");
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assert_equals(inner.scrollTop, 1000 - inner.clientHeight, "ScrollIntoView lands on the target's snap position regardless of the specified alignment.");
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// Since there is no snap points defined in the outer scroller, the outer
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// scroller finishes with "start" alignment, as specified in scrollIntoView.
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// Note that the "start" alignment aligns the target's top-left corner
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//(inner.left + inner.clientWidth - target.width, inner.top + inner.clientHeight - target.height)
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// with the outer scroller's top-left corner.
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assert_equals(outer.scrollLeft, 800 + inner.clientWidth, "ScrollIntoView ends with the specified alignment if no snap position is specified.");
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assert_equals(outer.scrollTop, 800 + inner.clientHeight, "ScrollIntoView ends with the specified alignment if no snap position is specified.");
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// Although the scrollIntoView specified "start" as the alignment, the window
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// has two other elements with snap points. So the window finishes with the
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// closest snap point.
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assert_equals(window.scrollX, 1100, "ScrollIntoView lands on the snap position closest to the specified alignment.");
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assert_equals(window.scrollY, 1100, "ScrollIntoView lands on the snap position closest to the specified alignment.");
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}, "All the scrollers affected by scrollIntoView should land on a snap position if one exists. Otherwise, land according to the specified alignment");
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</script>
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