Support CSS selector pseudo-classes #135
Description
Pseudo-selectors, like :focus, :focus-within, etc are not implemented.
Gost-DOM uses https://github.com/gost-dom/css to implement CSS selectors. This is derived from https://github.com/ericchiang/css - which doesn't appear to be maintained.
TODO: Research what the current library supports.
It's entirely possible that this library doesn't support pseudo-selectors at all, but it's possible it could implement classes such as :odd/:nth. It wouldn't know anything about :focus - maybe the caller can supply that context? Newer selectors, like :has are unlikely to work (AFAIK, this has been added since the library was last updated)