Why Large CSS Stylesheets Become Unmanageable Over Time

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Large CSS stylesheets tend to grow indefinitely because adding new rules feels safe while deleting old ones carries risk, creating a one-way ratchet of accumulation. Unlike compiled languages that flag unused variables or imports, CSS has no built-in feedback mechanism to signal when a rule has become irrelevant. Developers write defensive selectors and leave dead rules in place because the language offers no easy way to prove nothing depends on them across all pages and states. Over time, with multiple contributors, this silence compounds into thousands of lines of ambiguous, potentially vestigial code that no one dares remove. The article argues that explicit architectural boundaries, such as layer-based organisation, can make dead code easier to locate and safely delete.

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