WPT import https://crrev.com/c/1005997 introduced new failures in external/wpt/css:

List of new failures:
external/wpt/css/vendor-imports/mozilla/mozilla-central-reftests/ib-split/remove-from-split-inline-6.html [ Failure ]
external/wpt/css/vendor-imports/mozilla/mozilla-central-reftests/ib-split/split-inner-inline-2.html [ Failure ]
external/wpt/css/vendor-imports/mozilla/mozilla-central-reftests/ib-split/emptyspan-4.html [ Failure ]
external/wpt/css/vendor-imports/mozilla/mozilla-central-reftests/ib-split/emptyspan-1.html [ Failure ]

This import contains upstream changes from 8c503e75150f239ea2884392d26740a284859d1c to 827efec49afed216d98738b9cc60f63ca2bfc401:
WPT-fy Intel/user-timing/ tests: https://github.com/w3c/web-platform-tests/commit/827efec49afed216d98738b9cc60f63ca2bfc401
Test descendant invalidation for :host(..). bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1452640 gecko-commit: 00ac14e011212f55d75afd6043ac8e41636dec5f gecko-integration-branch: central gecko-reviewers: xidorn: https://github.com/w3c/web-platform-tests/commit/51615f8f71fc55884b36feb5c945a475402e73b9 [affecting this directory]
added special keys note (#10403): https://github.com/w3c/web-platform-tests/commit/e50487174bea36de374e7acecaceb260fd448b82
Revert "Enable ConsumeGestureOnNavigation by default": https://github.com/w3c/web-platform-tests/commit/1e801bf543872315879cefe3d755d83834eff0b1
Enable ConsumeGestureOnNavigation by default: https://github.com/w3c/web-platform-tests/commit/1a57aefa6587cf01691408a6d74cfd2ccecc915f
[css-typed-om] Add support for fill & stroke properties.: https://github.com/w3c/web-platform-tests/commit/d577e28a3e8db5d31b0e35ab3dcbd33304c1680f [affecting this directory]
[css-typed-om] Add support for font properties.: https://github.com/w3c/web-platform-tests/commit/e62fc73167b0c090d687e7c4c632745c5e98860a [affecting this directory]
[css-typed-om] Fix unsupported values in non-list-valued properties.: https://github.com/w3c/web-platform-tests/commit/cb4e20750f10c57702db9cfcf418dc5b33448489 [affecting this directory]
Implement deprecation of content type sniffing for workers.: https://github.com/w3c/web-platform-tests/commit/d9a9bcf8b69debee46db030d75a1217325a9ca77
Make sure table flex/grid items recalculate min/max widths.: https://github.com/w3c/web-platform-tests/commit/069680cf1da5c762e912246dbcc2d82a280cd48d [affecting this directory]
Fix #10388: Make resources/test use the upstream config (#10393): https://github.com/w3c/web-platform-tests/commit/429e62ef8b9b392e55faca0c44411159214307a9
Test box-shadow serialization (#9519): https://github.com/w3c/web-platform-tests/commit/5a93530d4db27df7a3154d9a5b75a0f36d592c6a [affecting this directory]
Tests for non-functional :host selector.: https://github.com/w3c/web-platform-tests/commit/149eff782b2a2c90c2250f656a0385849bf81fb7 [affecting this directory]
Add external WPT test for cross-origin requests: https://github.com/w3c/web-platform-tests/commit/46abbd55aa879ee92ce2f830819569936d9f531f
In HTML documents, always make sure we a body (#10376): https://github.com/w3c/web-platform-tests/commit/d258fe90d63872a39ea6c3b59074810c01bbf862
Test self.event in workers: https://github.com/w3c/web-platform-tests/commit/3543c82551c1c1c152885844b00b0af0d0e38864
Move the config into its own class (#10231): https://github.com/w3c/web-platform-tests/commit/bfef1f20a419d24633e48d24c14e6a7503e1d48c
Check for circular deps (#10334): https://github.com/w3c/web-platform-tests/commit/ad4ef4f58d232848a2acbde645a89d05fa3e3bcf
Remove generate_tests from NodeIterator.html (#10380): https://github.com/w3c/web-platform-tests/commit/509d7ab80243012857d1b19eda0e6f3b25f33e8e
Add tests for mathematical functions in <img sizes="">: https://github.com/w3c/web-platform-tests/commit/cc9648dde51ca42dfa40d1ff05c017dd3966929f
Add tests for Event.returnValue: https://github.com/w3c/web-platform-tests/commit/24f49ff15e22f7d81dbb87908efa0b5970b7add6
Add tests for Event.srcElement: https://github.com/w3c/web-platform-tests/commit/13597c4af7ac923309e740920cd42bed88113e5f
Avoid async/await in /webstorage/idlharness.html: https://github.com/w3c/web-platform-tests/commit/95992cd324d80acc68707b203be8c6cc2aebc6d5
Properly define EventInit in /webvr/idlharness.https.html: https://github.com/w3c/web-platform-tests/commit/2b8e0e7004fa407892b0966d2ae3d1ce68aaf678
service worker: Add tests for inteception of workers after redirects.: https://github.com/w3c/web-platform-tests/commit/6fe36d79072d5261ea504435b0dfedaf39f5805a
Make LazyFC assertions actually hold.: https://github.com/w3c/web-platform-tests/commit/fc7c0b7d097b3f584889127fd6ea350a1980cc7a [affecting this directory]
Correct serialization of box-shadow and text-shadow: https://github.com/w3c/web-platform-tests/commit/a835486e59a94236a55107fe34925079b33ef247 [affecting this directory]
Sync Mozilla tests as of https://hg.mozilla.org/mozilla-central/rev/b4bc6b2401738b78fd47127a4c716bb9178e1a09 . (#10358): https://github.com/w3c/web-platform-tests/commit/8f9d8e97bc197888e5f396f971e1c5e7c83f11b3 [affecting this directory]
Part 1: Add a web-platform test that shows shape-outside: border-box float areas are correctly clipped to margin rects. bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1328236 gecko-commit: b5bc270f37953f60d40f821b0593ff2e6200e343 gecko-integration-branch: central gecko-reviewers: dholbert: https://github.com/w3c/web-platform-tests/commit/85191e103da96e4b18301f088728dbc4f25f5e1e [affecting this directory]