1989520 - [wpt-sync] Sync PR 54873 - Make anchor-pos scroll snapshot test pass for run-snapshot-post-layout

Status: NEW

(Testing :: web-platform-tests, task, P4)

Description

[Web Platform Test Sync Bot [:wpt-sync] (Matrix: #interop:mozilla.org)]

Sync web-platform-tests PR 54873 into mozilla-central (this bug is closed when the sync is complete).

PR: https://github.com/web-platform-tests/wpt/pull/54873
Details from upstream follow.

Rune Lillesveen <[e-mail]> wrote:

Make anchor-pos scroll snapshot test pass for run-snapshot-post-layout

Let a style and layout update happen for a frame before expecting that
scroll snapshotting happened.

Preparing for proposed change:

https://github.com/whatwg/html/pull/11613

Bug: 384523570
Change-Id: Ie0575420a686903efdae5e88c27e1c593518820c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6954082
Commit-Queue: Rune Lillesveen \<[e-mail]>
Reviewed-by: Morten Stenshorne \<[e-mail]>
Cr-Commit-Position: refs/heads/main@{#1515992}

Comment 1

[Web Platform Test Sync Bot [:wpt-sync] (Matrix: #interop:mozilla.org)]

Attachment: Notable wpt changes

# CI Results

Ran 11 Firefox configurations based on mozilla-central, and Firefox, Chrome, and Safari on GitHub CI

Total 368 tests

## Status Summary

### Firefox
`OK`  : 1[GitHub] 228[Gecko-android-em-14-x86_64-debug-geckoview, Gecko-android-em-14-x86_64-lite-opt-geckoview, Gecko-android-em-14-x86_64-opt-geckoview, Gecko-linux2404-64-debug, Gecko-linux2404-64-opt, Gecko-windows11-32-24h2-debug, Gecko-windows11-32-24h2-opt, Gecko-windows11-64-24h2-debug, Gecko-windows11-64-24h2-opt]
`PASS`: 1[GitHub] 26[Gecko-linux2204-64-wayland-debug, Gecko-linux2204-64-wayland-opt] 12569[Gecko-windows11-32-24h2-debug, Gecko-windows11-32-24h2-opt] 12614[Gecko-windows11-64-24h2-debug, Gecko-windows11-64-24h2-opt] 12615[Gecko-android-em-14-x86_64-debug-geckoview, Gecko-android-em-14-x86_64-lite-opt-geckoview, Gecko-android-em-14-x86_64-opt-geckoview] 12616[Gecko-linux2404-64-debug, Gecko-linux2404-64-opt]
`FAIL`: 3[GitHub] 960[Gecko-windows11-32-24h2-debug, Gecko-windows11-32-24h2-opt] 1027[Gecko-android-em-14-x86_64-debug-geckoview, Gecko-android-em-14-x86_64-lite-opt-geckoview, Gecko-android-em-14-x86_64-opt-geckoview, Gecko-linux2404-64-debug, Gecko-linux2404-64-opt] 1029[Gecko-windows11-64-24h2-debug, Gecko-windows11-64-24h2-opt]

### Chrome
`OK`  : 1
`PASS`: 4

### Safari
`OK`  : 1
`PASS`: 4

## Links
[Gecko CI (Treeherder)](https://treeherder.mozilla.org/#/jobs?repo=try&revision=a456489cd4a3e268afd409a537d5b89ed886f7b0)
[GitHub PR Head](https://wpt.fyi/results/?sha=a9d0b4bc4a1d963a27de18ce8d9375ced84eb4eb&label=pr_head)
[GitHub PR Base](https://wpt.fyi/results/?sha=a9d0b4bc4a1d963a27de18ce8d9375ced84eb4eb&label=pr_base)

## Details

### Firefox-only Failures
* [/css/css-anchor-position/anchor-scroll-js-expose.html](https://wpt.live/css/css-anchor-position/anchor-scroll-js-expose.html) [[wpt.fyi](https://wpt.fyi/results/css/css-anchor-position/anchor-scroll-js-expose.html)]
  * Range.getBoundingClientRect() returns the actual rendered location: `FAIL` [`Gecko-android-em-14-x86_64-debug-geckoview`, `Gecko-android-em-14-x86_64-lite-opt-geckoview`, `Gecko-android-em-14-x86_64-opt-geckoview`, `Gecko-windows11-32-24h2-debug`, `Gecko-windows11-32-24h2-opt`, `Gecko-windows11-64-24h2-debug`, `Gecko-windows11-64-24h2-opt`, `GitHub`], `PASS` [`Gecko-linux2404-64-debug`, `Gecko-linux2404-64-opt`] linked bugs:Bug 1798455, Bug 1834726

(See attachment for full changes)