Accessibility testing checks whether a digital product can be used by people with disabilities and with assistive technologies such as screen readers, keyboard-only navigation, voice input, or magnifiers. It goes beyond visual appearance: a page may look fine and still fail if controls are unlabeled, focus order is broken, or content is not exposed with semantic HTML.
In cyber security and product defense, accessibility testing matters because unusable interfaces create operational risk and compliance risk. It helps teams find barriers before release, when they are cheaper to fix. Attackers may also benefit from inaccessible flows, since confusing forms, weak error handling, and inconsistent navigation can hide defects in login, recovery, or payment paths. Good testing combines automated checks with manual review by users and testers who rely on assistive tools, ensuring the service is both secure and actually operable.