Version-sensitive. Every API name, SDK gate and browser-support claim below was verified on 2026-09-08 against primary sources. What against, and when, is in . If that date is old, re-verify before acting on a version number. Mobile Principles Touch-first UX context. Loaded when mobile is detected (web mobile, iOS, Android). Concise rules here. Deep-dive in . --- Touch Targets | Platform | Recommended (design to this) | Hard floor | Spacing | Spec | |---|---|---|---|---| | Apple iOS / iPadOS | 44x44 pt | 28x28 pt | 12 pt padding around bezeled controls, 24 pt around unbezeled ones | Apple HIG…