On Input

WCAG 2.1 success criterion 3.2.2 (Level A) requires that changing the setting of any user interface component does not automatically cause a change of context (e.g., submitting a form, navigating to a new page, or moving focus to another component) unless the user has been advised of the behavior before using the component. Common violations include dropdown menus that auto-submit forms on selection, payment fields that auto-submit after a passcode is entered, and inputs that navigate elsewhere on blur. This criterion protects keyboard users, screen reader users, and anyone whose cognitive model of the interface assumes that explicit submit actions are required, and supports the Predictable guideline under the Understandable POUR principle.