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It's an ID selector, not a general selector. Implementation next...
&& needs to consume all the words *and* all the verifiers. It means the sub-verifiers must all occur, in any order; each may eat zero or more contiguous words. Also note that words can't be null here.
A b expression is just a sequence of numbers separated by 'b''s. It may not include anything else, as is obvious from the verifier method itself. So the old code could incorrectly match 1b2a3b4 as a single b (&&) expression, and then fail in the verifier. Note also that if we use more complex patterns, && binds more strongly than ||, so it would be wrong to allow this even if we could support it.
Similarly, 'a' (||) may only join numbered expressions. This was true until 'b' (&&) was introduced. Simplify the code and make sure it is still true: 1a2a3a4 is a valid || expression, but 1a2b3 is not valid at all, just like 1b2a3.
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This goes a bit further than #445. It documents the syntax and limitations and also fixes some potentially confusing bugs in future parsing rules. It is not urgent. CSS tests pass.