Bug 110763

Summary: [Shadow]: @host rules defined within @media selectors are not applied
Product: WebKit Reporter: Steve Orvell <sorvell>
Component: DOMAssignee: Web Components Team <webcomponents-bugzilla>
Status: RESOLVED CONFIGURATION CHANGED    
Severity: Normal CC: dglazkov, dominicc, ericbidelman, rniwa, tabatkins, tasak, webcomponents-bugzilla
Priority: P2 Keywords: HasReduction
Version: 528+ (Nightly build)   
Hardware: Mac (Intel)   
OS: Unspecified   
Bug Depends on:    
Bug Blocks: 59827    
Attachments:
Description Flags
reduction none

Steve Orvell
Reported 2013-02-25 09:50:45 PST
Created attachment 190076 [details] reduction With a construction like this, an @host rule is not applied. @media screen and (max-width: 800px) { @host { * { background: green; } } } See the attached reduction and resize the window > and < 800px width to observe results.
Attachments
reduction (763 bytes, text/html)
2013-02-25 09:50 PST, Steve Orvell 		no flags
Details
View All Add attachment proposed patch, testcase, etc.
Takashi Sakamoto
Comment 1 2013-03-08 00:33:43 PST
Currently CSSGrammar.y.in cannot parse @host in @media. So we need to modify CSSGrammar.y.in (maybe, adding host to block_valid_rule). However if we change the place of @host with @media's (I'm not sure whether this is a valid css code or not), i.e. @host { @media screen and (max-width: 800px) { * { background: green; } } } we need to change RuleSet.cpp (i.e. RuleSet::addChildRules).
Dimitri Glazkov (Google)
Comment 2 2013-03-08 09:21:15 PST
Tab, can you chime in on what's valid syntax or not?
Dominic Cooney
Comment 3 2013-03-10 22:25:17 PDT
We are seeking clarification from the spec: <https://www.w3.org/Bugs/Public/show_bug.cgi?id=21242> Given a lawyerly reading of that, @host rules should not be parsed in a stylesheet at all because the 'host' production, though defined, is not used in the 'stylesheet' production.
Ryosuke Niwa
Comment 4 2019-10-04 22:52:36 PDT
@host isn't a thing anymore.
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