Design Principle
Critical mobile actions should be thumb-reachable without covering content, errors, or system navigation.
Principle
Critical mobile actions should be thumb-reachable without covering content, errors, or system navigation.
Design action
Pin primary action, secondary action, or price summary to the bottom safe area; add bottom padding and handle keyboard-open states.
Examples
Positive example: Mobile checkout, detail purchase, form submit, filter apply, and multi-step flows. Counterexample: The sticky bottom bar covers the last form error.
Apply when
Mobile checkout, detail purchase, form submit, filter apply, and multi-step flows. Users need to judge state, scope, risk, or next action quickly.
Source notes
Source note: Synthesized from Apple HIG, Material Design, GOV.UK/Polaris/Atlassian component practices, and interaction accessibility principles. Apple HIG Motion: https://developer.apple.com/design/human-interface-guidelines/motion Material Design Motion: https://m3.material.io/styles/motion/overview/how-it-works GOV.UK Design System Patterns: https://design-system.service.gov.uk/patterns/ Shopify Polaris Patterns: https://polaris-react.shopify.com/patterns Atlassian Empty State: https://atlassian.design/components/empty-state
Agent Directive
Pin primary action, secondary action, or price summary to the bottom safe area; add bottom padding and handle keyboard-open states.