Accessibility

ng-if removes content and destroys focused descendants. Before closing a dialog, menu, or editor, choose the element that regains focus. ng-show retains the subtree; verify hidden descendants cannot remain in keyboard order.

Use native buttons, links, labels, headings, and lists before ARIA. Attach AngularTS events to those controls instead of rebuilding their keyboard behavior on generic elements.

Associate errors with controls using aria-describedby. Show invalid state after interaction or submission, retain the invalid value, focus the first invalid control after failed submission, and provide a summary for long forms. Server failures are separate from field constraints.

Use a polite live region for completion or background updates and an alert for failures requiring immediate attention. Do not place an entire keyed list in a live region.

Test direct route entry, route transitions, keyed reordering, loading replacement, reduced motion, zoom, keyboard-only operation, and a screen-reader workflow. Automated rules cannot determine whether focus movement makes sense.