Modern browsers now release new CSS features behind feature flags to gather real-world developer feedback before full adoption. Major browsers like Chrome, Firefox, and Safari have unique ways to handle these flags. Chrome uses chrome://flags to enable broader categories of features, Firefox offers a granular approach through about:config, and Safari presents a dedicated tab in the Develop menu for easier toggling of experimental features. This strategy helps to minimize legacy support issues seen with previous methods like vendor prefixes.
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