Selectors: Add support for comma-separated selector lists in pseudo-classes #90
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When this project was first written, comma-separated values for pseudo classes (
:not,:where, etc) were not widely supported. The expectation that commas would only separate top-level selectors was creating a syntax error when they were nested, as the tool tried to check the specificty of an interrupted selector, for examplediv:is(.class.This PR updates the parsing to use csstree for selector list parsing, preventing the need to manually split a selector. Additionally, I've added tests and support for specificity values of
:not,:where,:isselectors.