70f8c11ea0
Automatic update from web-platform-tests Ignore layout shifts for adding/removing position:fixed - Treat position:fixed in scrolling LayoutView as layout shift root (by checking CompositingReason::kScrollDependentPosition, which also covers the previous sticky position condition). - Check whether an object was a layout shift root at the beginning of PaintPropertyTreeBuilder::UpdateForSelf(). Previously was_layout_shift_root was incorrect if UpdateFragments() removed PaintProperties() of the FragmentData. - Update layout_shift_root_changed in both UpdateForSelf() and UpdateForChildren(), so that the flag also applies to the object itself if any paint properties in UpdateForSelf() affected layout shift root status. Bug: 1150657 Change-Id: I74a5e3bab93e66483b47eb27a04e7bf2277ee1c9 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2665761 Reviewed-by: Chris Harrelson <chrishtr@chromium.org> Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org> Cr-Commit-Position: refs/heads/master@{#849650} -- wpt-commits: d47b8fbabcc1de1eca266a9aee12f6d348eee93f wpt-pr: 27436
36 lines
1.0 KiB
HTML
36 lines
1.0 KiB
HTML
<!DOCTYPE html>
|
|
<title>Layout Instability: no shift for adding/removing position:fixed</title>
|
|
<link rel="help" href="https://wicg.github.io/layout-instability/" />
|
|
<div id="target" style="width: 100px; height: 100px; background: green;
|
|
position: absolute; top: 200px"></div>
|
|
<div style="height: 2000px"></div>
|
|
<script src="/resources/testharness.js"></script>
|
|
<script src="/resources/testharnessreport.js"></script>
|
|
<script src="resources/util.js"></script>
|
|
<script>
|
|
|
|
promise_test(async () => {
|
|
const watcher = new ScoreWatcher;
|
|
|
|
// Wait for the initial render to complete.
|
|
await waitForAnimationFrames(2);
|
|
|
|
window.scrollTo(0, 1000);
|
|
target.style.position = 'fixed';
|
|
target.style.top = 0;
|
|
|
|
await waitForAnimationFrames(3);
|
|
assert_equals(watcher.score, 0);
|
|
|
|
window.scrollTo(0, 100);
|
|
target.style.position = 'absolute';
|
|
target.style.top = '200px';
|
|
|
|
await waitForAnimationFrames(3);
|
|
assert_equals(watcher.score, 0);
|
|
}, "No shift for adding/removing position:fixed.");
|
|
|
|
</script>
|
|
|
|
|