Direct link to the article Understand why CSS has no effect with the Inactive CSS rules indicator in Firefox DevTools

Understand why CSS has no effect with the Inactive CSS rules indicator in Firefox DevTools

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It’s useful when DevTools tells you that a declaration is invalid. For example, colr: red; isn’t valid because colr isn’t a valid property. Likewise color: rd; isn’t valid because rd isn’t a valid value. For the most part, a browser’s …

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