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Bug 1878762 [wpt PR 44405] - [css-scroll-snap-2] Prioritize inner snap targets, a=testonly

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[css-scroll-snap-2] Prioritize inner snap targets

Prefer nested snap targets, per step 5[1].

The change to scroll_snap_data_unittest.cc is to make the scroll's
ending position a little closer to outside small_2. Otherwise, either
snapping to the bottom of small_2 or out of it is a viable option.

[1] https://github.com/w3c/csswg-drafts/issues/9622#issue-2006578282

Bug: 323840828
Change-Id: Ic2c41e7a4b47a74e85581c8f3b5eb88a42719219
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5269646
Reviewed-by: Steve Kobes <skobes@chromium.org>
Commit-Queue: David Awogbemila <awogbemila@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1260782}

--

wpt-commits: 4719225513d3ac5575b147324de4f366f60a92fe
wpt-pr: 44405
This commit is contained in:
David Awogbemila 2024-02-15 16:45:07 +00:00 committed by moz-wptsync-bot
parent a5b025f3bf
commit 02328f9dbd
1 changed files with 148 additions and 0 deletions
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148
testing/web-platform/tests/css/css-scroll-snap/snap-after-relayout/multiple-aligned-targets/prefer-inner-target.html Normal file
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<!DOCTYPE html>
<html>
<head>
<link rel="help" href="https://drafts.csswg.org/css-scroll-snap" />
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/dom/events/scrolling/scroll_support.js"></script>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-actions.js"></script>
<script src="/resources/testdriver-vendor.js"></script>
<script src="resources/common.js" ></script>
</head>
<body>
<style>
.scroller {
overflow: scroll;
position: relative;
height: 400px;
width: 400px;
border:solid 1px black;
scroll-snap-type: y mandatory;
}
.no-snap { scroll-snap-align: none }
.scroller div:focus {
border: solid 1px red;
}
.large-space {
height: 300vh;
width: 300vw;
position: absolute;
}
.target {
scroll-snap-align: start;
position: absolute;
width: 100px;
height: 100px;
border: solid 1px black;
}
.top {
top: 0px;
}
.left {
left: 0px;
}
.right {
left: 200px;
}
.bottom {
top: 200px;
}
.inner {
text-align: right;
}
.inner1 {
height: 150px;
width: 150px;
top: 150px;
left: 100px;
background-color: blue;
}
.inner2 {
height: 100px;
width: 100px;
top: 150px;
left: 100px;
background-color: pink;
}
.inner3 {
height: 75px;
width: 75px;
top: 150px;
left: 100px;
background-color: green;
}
.inner4 {
height: 50px;
width: 50px;
top: 150px;
left: 100px;
background-color: grey;
}
.outer {
height: 200px;
width: 200px;
top: 150px;
left: 50px;
left: 50px;
background-color: yellow;
}
</style>
<div id="scroller" class="scroller">
<div class="large-space"></div>
<div class="top left target">Top Left</div>
<div class="top right target">Top Right</div>
<div class="outer target" id="outer">Outer</div>
<div class="inner inner1 target" id="inner1">I1</div>
<div class="inner inner2 target" id="inner2">I2</div>
<div class="inner inner3 target" id="inner3">I3</div>
<div class="inner inner4 target" id="inner4">I4</div>
</div>
<script>
function cleanup() {
inner.style.top = 100;
outer.style.top = 100;
}
window.onload = (async () => {
const inner1 = document.getElementById("inner1");
const inner2 = document.getElementById("inner2");
const inner3 = document.getElementById("inner3");
const inner4 = document.getElementById("inner4");
const outer = document.getElementById("outer");
const scroller = document.getElementById("scroller");
promise_test(async (t) => {
await waitForCompositorCommit();
await runScrollSnapSelectionVerificationTest(t, scroller,
[inner1, inner2, inner3, inner4, outer], inner4, "y");
// Push inner4 outside the snapport. It should no longer be considered
// the snap target; inner3 is next in line.
inner4.style.left = "500px";
await runScrollSnapSelectionVerificationTest(t, scroller,
[inner1, inner2, inner3, inner4, outer], inner3, "y");
inner4.style.left = "100px";
}, "snap container selects innermost area as snap target");
promise_test(async (t) => {
t.add_cleanup(() => {
outer.style.top = "150px";
});
await waitForCompositorCommit();
// Move outer target below inner targets.
outer.style.top = "400px";
// Snap to now-below outer target.
scroller.scrollTop = outer.offsetTop;
runLayoutSnapSeletionVerificationTest(t, scroller,
[inner1, inner2, inner3, inner4], outer, "y");
}, "snap container follows selected snap target after layout change " +
"(the pre-existing snap target should not be overriden because of " +
"the innermost area)");
});
</script>
</body>
</html>