ReadonlyconditionReadonlyregionReadonlytopReadonlyvalidatorFor relational pseudo-class :has() support
The name of the function taking a selector list as argument
Optionalparams: (string | number)[]Optional parameters (e.g., [a, b] for nth-child(An+B of S))
ParserHandler for
@pagerules. It handles properties specified with page contexts. It also does basic cascading (which can be done without information other than the page rules themselves) and stores the result inpagePropsobject as a map from page selectors to sets of properties. This result is later used for adding@pagerules to the real DOM, which are then used by the PDF renderer (Chromium) to determine page sizes.