Handling Forms & User Input

aria-invalid and aria-describedby are crucial for accessible form validation: 1) aria-invalid indicates invalid fields to screen readers, 2) aria-describedby connects error messages to inputs for screen readers, 3) Ensures validation feedback is accessible to all users, 4) Works with both custom and native validation, 5) Should be updated dynamically as validation state changes, 6) Complements visual error indicators for complete accessibility.