seniorCSS
A/B Testing CSS Architectures safely.
Updated Apr 28, 2026
Short answer
Testing massive CSS refactors requires isolating stylesheets and managing specificity to prevent visual regressions.
Deep explanation
When migrating from legacy monolith CSS to modern modular CSS (or Tailwind), use a routing-level split or scope legacy CSS inside a specific parent class, effectively versioning the CSS delivery.
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