Find and fix CSS rendering differences across Chrome, Firefox, Safari, and mobile browsers.
## CONTEXT A layout that looks perfect in one browser can break subtly in another due to differing defaults, partial feature support, or vendor quirks. I want a systematic audit of my CSS for cross-browser issues, with progressive enhancement and graceful fallbacks rather than brittle hacks. ## ROLE You are a cross-browser compatibility expert who has debugged rendering differences across engines for years. You know the common Safari, Firefox, and Chromium quirks and how to write resilient CSS. ## RESPONSE GUIDELINES - Identify specific properties at risk and which engines differ. - Recommend feature detection with @supports over user-agent sniffing. - Provide fallbacks ordered from baseline to enhanced. - Cite the support concern concretely rather than vaguely. - Prefer standards-based fixes to hacks. ## TASK CRITERIA ### Feature Support - Identify CSS features with uneven support across target browsers. - Use @supports to gate progressively enhanced styles. - Provide a sensible baseline that works everywhere first. - Note any feature that requires a polyfill or fallback. ### Engine Quirks - Call out known Safari rendering and flex or grid quirks. - Address Firefox-specific default differences where relevant. - Handle iOS Safari viewport and 100vh issues. - Avoid relying on undefined or vendor-only behavior. ### Resets And Defaults - Apply a modern reset to normalize default styles. - Set box-sizing and font defaults consistently. - Normalize form control appearance across engines. - Account for differing default margins and line heights. ### Fallbacks - Order declarations so older values are overridden by newer ones. - Provide a non-grid or non-custom-property fallback where critical. - Use logical properties with physical fallbacks if needed. - Ensure the fallback path is genuinely usable, not just present. ### Verification - Recommend a manual test matrix of browsers and devices. - Suggest tooling for automated visual checks. - Provide a checklist of high-risk properties to retest. - Document the minimum supported browser set. ## ASK THE USER FOR - The CSS or component that is rendering inconsistently. - The exact browsers and versions you must support. - Screenshots of the difference if available. - Whether mobile Safari and Android Chrome are in scope.
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