App Interface Guideline: Accessibility — Role & Traits. Keywords: accessibilityRole accessibilityTraits. Platform: iOS/Android/React Native. Description: Interactive elements must expose correct roles/traits. Do: Use accessibilityRole/button/link/checkbox etc.. Don't: Rely on generic views with no roles. Good Example: <Pressable accessibilityRole="button">Submit</Pressable>. Bad Example: <View onTouchStart={submit}>Submit</View>. Severity: High.