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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 00:47:55 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 00:47:55 +0000 |
| commit | 26a029d407be480d791972afb5975cf62c9360a6 (patch) | |
| tree | f435a8308119effd964b339f76abb83a57c29483 /testing/web-platform/tests/css/css-scroll-anchoring/heuristic-with-offset-update.html | |
| parent | Initial commit. (diff) | |
| download | firefox-26a029d407be480d791972afb5975cf62c9360a6.tar.xz firefox-26a029d407be480d791972afb5975cf62c9360a6.zip | |
Adding upstream version 124.0.1.upstream/124.0.1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'testing/web-platform/tests/css/css-scroll-anchoring/heuristic-with-offset-update.html')
| -rw-r--r-- | testing/web-platform/tests/css/css-scroll-anchoring/heuristic-with-offset-update.html | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/testing/web-platform/tests/css/css-scroll-anchoring/heuristic-with-offset-update.html b/testing/web-platform/tests/css/css-scroll-anchoring/heuristic-with-offset-update.html new file mode 100644 index 0000000000..7fcbd983ed --- /dev/null +++ b/testing/web-platform/tests/css/css-scroll-anchoring/heuristic-with-offset-update.html @@ -0,0 +1,58 @@ +<!DOCTYPE html> +<meta charset="utf-8"> +<link rel="help" href="https://drafts.csswg.org/css-scroll-anchoring-1/"> +<script src="/resources/testharness.js"></script> +<script src="/resources/testharnessreport.js"></script> +<html> +<head> + <style type="text/css"> + #scroller { + overflow: scroll; + height: 500px; + height: 500px; + } + #before { + height: 200px; + } + #anchor { + position: relative; + width: 200px; + height: 200px; + margin-bottom: 500px; + background-color: blue; + /* + * To trigger the Gecko bug that's being regression-tested here, we + * need 'top' to start out at a non-'auto' value, so that the + * dynamic change can trigger Gecko's "RecomputePosition" fast path + */ + top: 0px; + } + </style> +</head> +<body> + <div id="scroller"> + <div id="before"> + </div> + <div id="anchor"> + </div> + </div> + + <script type="text/javascript"> + test(() => { + let scroller = document.querySelector('#scroller'); + let before = document.querySelector('#before'); + let anchor = document.querySelector('#anchor'); + + // Scroll down to select #anchor as a scroll anchor + scroller.scrollTop = 200; + + // Adjust the 'top' of #anchor, which should trigger a suppression + anchor.style.top = '10px'; + + // Expand #before and make sure we don't apply an adjustment + before.style.height = '300px'; + assert_equals(scroller.scrollTop, 200); + }, 'Positioned ancestors with dynamic changes to offsets trigger scroll suppressions.'); + </script> +</body> +</html> |