1a2c670c32
A scoped style can match the featureless shadow host: * Constructed stylesheets adopted by the shadow DOM * Implicit scope defined in `<style>` at shadow root * Explicit scope with `scope-start` selector of `:host` Hence, they should not be considered non-featureless selector during parse time, adding to featureless host rules when we can determine if we're in one of the above cases. Differential Revision: https://phabricator.services.mozilla.com/D207782
rust-selectors
CSS Selectors library for Rust. Includes parsing and serilization of selectors, as well as matching against a generic tree of elements. Pseudo-elements and most pseudo-classes are generic as well.
Warning: breaking changes are made to this library fairly frequently (13 times in 2016, for example). However you can use this crate without updating it that often, old versions stay available on crates.io and Cargo will only automatically update to versions that are numbered as compatible.
To see how to use this library with your own tree representation,
see Kuchiki’s src/select.rs.
(Note however that Kuchiki is not always up to date with the latest rust-selectors version,
so that code may need to be tweaked.)
If you don’t already have a tree data structure,
consider using Kuchiki itself.