How to Handle Keyboard Focus Traps in Modals for Web Accessibility

Web accessibility requires that all interactive elements, including modals, be fully navigable using only a keyboard, as many users with visual or physical disabilities rely on it. A keyboard trap occurs when focus enters a section of a page and cannot be moved out using keyboard controls alone. For modals specifically, intentionally trapping focus inside is correct behavior — Tab should cycle only through elements within the modal, and pressing Esc or a close button must return focus to the element that triggered it. Without a keyboard-accessible exit, the modal becomes a true trap, rendering parts of the page unusable until a reload. The native HTML dialog element, governed by WCAG Success Criterion 2.1.2, handles all of this automatically, eliminating the need for custom keyboard management code.