Add selector specificity tests pinning cascade ordering#4091
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Lock in the CSS 2.1 specificity the internal Selector AST computes (id 100, class / attribute / pseudo 10, element 1, universal 0; combinators sum, selector lists report the maximum). Cascade order depends on these values, so the replacement parser planned for Phase 3 step 2 must reproduce them.
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These tests pin the CSS 2.1 specificity that the internal Selector AST computes: 100 for an id, 10 for a class, attribute or pseudo-class, 1 for an element, and 0 for the universal selector, with combinators summing their operands and a selector list reporting the maximum.
Cascade ordering depends on these values, so locking them in keeps the parser replacement planned for the next step from silently shifting selector precedence.
The change is test-only and touches no production code.
Contributes to #3980.