Bug 212049

Summary:	:is() / :where() parsing allows breaking shadow tree encapsulation
Product:	WebKit	Reporter:	Emilio Cobos Álvarez (:emilio) <emilio>
Component:	CSS	Assignee:	Nobody <webkit-unassigned>
Status:	NEW ---
Severity:	Normal	CC:	ahmad.saleem792, bfulgham, koivisto, rniwa, simon.fraser, webkit-bug-importer, zalan
Priority:	P2	Keywords:	BrowserCompat, InRadar, WPTImpact
Version:	WebKit Nightly Build
Hardware:	Unspecified
OS:	Unspecified
Bug Depends on:
Bug Blocks:	148695

Description Emilio Cobos Álvarez (:emilio) 2020-05-18 15:17:06 PDT

I'm adding some tests in https://bugzilla.mozilla.org/show_bug.cgi?id=1632647. But TLDR, these shouldn't probably parse, or if you disagree they probably shouldn't match:

  ::part(foo):is([attr='value'])
  :host(:is(div .foo))

Comment 1 Ahmad Saleem 2023-05-27 09:56:23 PDT

Following WPT test was pushed as part of Mozilla bug: https://github.com/web-platform-tests/wpt/pull/23711/files

and we are only failing single test:

https://wpt.fyi/results/css/selectors/is-where-parsing.html?label=master&label=experimental&aligned&q=is-where-parsing.html

>>> Nested inside :host, with combinators

Don't know whether we have it as separate tracking or not but still adding 'BrowserCompat' and "WPTImpact' tags for future tracking.

Comment 2 Radar WebKit Bug Importer 2024-02-08 13:15:40 PST

<rdar://problem/122574812>