merge_pr_59094

Add more table tests for css-backgrounds (#59094)

WebKit export of following commits for table tests:

https://commits.webkit.org/305987@main
https://commits.webkit.org/310609@main
https://commits.webkit.org/306956@main

merge_pr_59131

Add shadowrootslotassignment serialization test (#59131)

merge_pr_59130

Add a crashtest.

Differential Revision: https://phabricator.services.mozilla.com/D292156

bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=2026295
gecko-commit: 79aac377851e8a23f4dd6779b7dfe6f77d1e5296
gecko-commit-git: 32a1808c6ddf2fdf1a8511fa16627b9ad4a1abf9
gecko-reviewers: dholbert

merge_pr_59116

WebKit export of https://bugs.webkit.org/show_bug.cgi?id=289438 (#59116)

merge_pr_59115

WebKit export of https://bugs.webkit.org/show_bug.cgi?id=310587 (#59115)

merge_pr_59111

WebKit export of https://bugs.webkit.org/show_bug.cgi?id=304911 (#59111)

merge_pr_59110

WebKit export of https://bugs.webkit.org/show_bug.cgi?id=305066 (#59110)

merge_pr_59107

WebKit export of https://bugs.webkit.org/show_bug.cgi?id=301023

merge_pr_59106

WebKit export of https://bugs.webkit.org/show_bug.cgi?id=311942 (#59106)

• WebKit export of https://bugs.webkit.org/show_bug.cgi?id=311942

merge_pr_59101

Fix children hint computation for style queries.

We can't just early-return CASCADE_SELF now, it's not sound in presence
of container queries if the custom properties or container-name changes.

While at it, improve custom properties reset property diffing, so that
changes to non-inherited custom properties get optimized the same way as
regular properties.

Differential Revision: https://phabricator.services.mozilla.com/D292405

bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=2029949
gecko-commit: a333985c4f995181ee3b279d034a6e894f6f32ad
gecko-commit-git: b655a605eb335ac3f1bf44511704f09965582b1e
gecko-reviewers: diegociudadreale