A CSS redundancy analyzer that analyzes redundancy.

Gives you output like:

{.contact .content .primary} and {article, #comments} share 5 rules

If you have multiple selectors sharing five or more rules (properties with the same value), that's likely a good opportunity for optimization (combine into new class or comma separate selectors elsewhere).

Someone should make a hosted version where you just drag-and-drop a .css file to analyze.

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