Bogus Combinators.Changes

Draft 4

• In Phase 1:

  • Forbid bogus selectors in selector pseudos at the syntactic level, rather than including them in the definition of "bogus".

  • Forbid bogus extend targets at the syntactic level.

  • Allow leading combinators for selector.extend(), selector.replace(), and selector.unify(). Extending these selectors is required to support plain CSS nesting.

• In Phase 2:

  • Explicitly produce deprecation warnings for syntax that is manually declared as forbidden.

Draft 3

• In Phase 1:

  • Clarify the definition of bogus selectors.

  • Only omit style rules if all of their complex selectors are bogus.

  • Expand the set of selectors that are treated by the extend algorithm as matching nothing to include bogus pseudo selectors, since these can never be transformed into anything useful.

• In Phase 2:

  • Don't throw an error for style rules that contain no children, since this would break nesting.

  • Throw an error for an @extend rule with a bogus extender.

  • Support single leading combinators.

  • Support complex selectors composed of only a single combinator.

  • Allow bogus selectors in selector.append().

Draft 2

• Allow leading combinators in :has().

• Replace our custom Combinator production with the CSS spec's <combinator>.

Draft 1

• Initial draft.