CSS Cascade Is One Algorithm, Not Six Separate Rules Developers Memorize

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Most developers learn CSS concepts like specificity, inheritance, and source order in isolation, typically while debugging, rather than as parts of a single unified system. The browser's cascade resolution algorithm processes rules in a fixed sequence: origin and importance first, then layer order, then specificity, and finally source order, with inheritance filling any gaps. Because this sequence is rarely taught end to end, teams often waste time debugging at the wrong stage — for example, fighting specificity battles already decided by layer order. This fragmented understanding leads many teams to build workarounds such as naming conventions and scoping tools to solve problems the browser's own algorithm already handles. Treating the cascade as one ordered engineering contract, rather than a collection of isolated facts, allows teams to design CSS systems predictably and intentionally.

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