CSS Psuedo Hover After and Beyond
summary
Covers practical, browser-aware recipes for using over 35+ pseudo-classes/elements: :after/:before for icons and tooltips, form states (checked, indeterminate, required, valid/invalid), placeholder and :placeholder-shown, and layout selectors that scale like nth-child arithmetic and quantity queries (including nth-last variants). Explains that :not() preserves argument specificity as :not() specificity behavior, notes IE8 single-colon quirks and vendor-prefixed placeholders, and demos upcoming selectors like :focus-within and :has() with support caveats and simple HTML/CSS examples.
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