Vladimir Levin
307d89895c
Automatic update from web-platform-tests anchor: Respect needs scroll anchor adjustment in axis This patch ensures that when dealing with remembered scroll offsets we respect whether we need an adjustment in a particular axis. If we don't, we don't include the adjustment in that axis. R=ikilpatrick@chromium.org Bug: 521929404 Change-Id: If49fc4dbc0a27b1d372247f5f8cd2c43a34e4e5d Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7934209 Reviewed-by: Ian Kilpatrick <ikilpatrick@chromium.org> Commit-Queue: Vladimir Levin <vmpstr@chromium.org> Cr-Commit-Position: refs/heads/main@{#1646802} -- wpt-commits: b3097487d7ce5ef273fc65ded30c1b89e3081d71 wpt-pr: 60594
83 lines
2.2 KiB
HTML
83 lines
2.2 KiB
HTML
<!DOCTYPE html>
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<title>CSS Anchor Positioning: Fallback evaluation should only consider scroll adjustment axes</title>
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<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#scroll">
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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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body {
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margin: 0;
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}
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#scroller {
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overflow: scroll;
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width: 400px;
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height: 400px;
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border: 1px solid black;
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}
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#spacer {
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height: 1000px;
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width: 1000px;
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}
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#anchor {
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anchor-name: --anchor;
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width: 100px;
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height: 100px;
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background: blue;
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margin-top: 150px;
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margin-left: 150px;
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}
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#anchored {
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position: fixed;
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position-anchor: --anchor;
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right: anchor(left);
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left: auto;
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top: 150px;
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width: 100px;
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height: 100px;
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background: red;
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position-try-fallbacks: --fallback;
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display: none; /* Hide initially */
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}
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@position-try --fallback {
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background: green;
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left: 0px;
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right: auto;
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}
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</style>
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<div id="scroller">
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<div id="spacer">
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<div id="anchor"></div>
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</div>
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</div>
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<div id="anchored"></div>
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<script>
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promise_test(async () => {
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const anchored = document.getElementById('anchored');
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const scroller = document.getElementById('scroller');
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// 1. Scroll scroller to Y=400 first.
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scroller.scrollTop = 400;
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await new Promise(resolve => requestAnimationFrame(resolve));
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// 2. Show the element. Layout will happen at Y=400, X=0.
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anchored.style.display = 'block';
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await new Promise(resolve => requestAnimationFrame(resolve));
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// Initial state: fits, should be at left 51.
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assert_equals(anchored.getBoundingClientRect().left, 51, 'Initial left should be 51');
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// 3. Scroll scroller horizontally by 300px.
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// The anchor moves left, pushing the anchored element off-screen left.
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// This should trigger the X fallback (move to left 0).
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scroller.scrollLeft = 300;
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// Wait for scroll and layout
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await new Promise(requestAnimationFrame);
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await new Promise(requestAnimationFrame);
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assert_equals(anchored.getBoundingClientRect().left, 0, 'Left after scroll should be 0 (fallback)');
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}, "Horizontal overflow fallback");
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</script>
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