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LibWeb: Parse media queries! :^)

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While not complete by any means, we are now compatible with the [level 3
spec](https://www.w3.org/TR/css3-mediaqueries/#syntax) and some parts of
[level 4.](https://www.w3.org/TR/mediaqueries-4#mq-syntax)

Compatibility with level 4+ requires:
- Implementing the range syntax: `(800px <= width <= 1200px)`
- Parsing `<general-enclosed>`, which represents syntax that is not yet
used but they may use in the future.
This commit is contained in:
Sam Atkins 2021-09-29 20:54:06 +01:00 • committed by Andreas Kling
parent 2ed0f880ee
commit bd648d082c
2 changed files with 279 additions and 6 deletions
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5
Userland/Libraries/LibWeb/CSS/Parser/Parser.h
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@ -227,7 +227,10 @@ private:
Optional<Selector::Combinator> parse_selector_combinator(TokenStream<StyleComponentValueRule>&);
Result<Selector::SimpleSelector, ParsingResult> parse_simple_selector(TokenStream<StyleComponentValueRule>&);
static NonnullRefPtr<MediaQuery> parse_media_query(TokenStream<StyleComponentValueRule>&);
NonnullRefPtr<MediaQuery> parse_media_query(TokenStream<StyleComponentValueRule>&);
OwnPtr<MediaQuery::MediaCondition> consume_media_condition(TokenStream<StyleComponentValueRule>&);
Optional<MediaQuery::MediaFeature> consume_media_feature(TokenStream<StyleComponentValueRule>&);
Optional<MediaQuery::MediaType> consume_media_type(TokenStream<StyleComponentValueRule>&);
static bool has_ignored_vendor_prefix(StringView const&);