Focus Trap
A focus trap is an accessibility technique in web development that confines keyboard focus within a specific UI element, such as a modal dialog or dropdown menu, preventing users from tabbing outside of it. This ensures that users, especially those relying on assistive technologies like screen readers, can navigate interactive components without losing context or getting stuck in inaccessible parts of the page. It's commonly implemented using JavaScript to manage focus events and DOM elements.
Developers should learn and use focus traps to enhance accessibility and user experience in modal windows, pop-ups, and other interactive overlays, as required by WCAG guidelines for keyboard navigation. This is critical in applications like e-commerce checkouts or admin panels where users must complete actions without distraction. It prevents accessibility issues where keyboard-only users might tab into hidden or background content, improving compliance and usability for all users.