A keyboard trap is a focused website component that a person can enter with a keyboard but cannot leave using a keyboard. Fix it by providing a clear keyboard exit, restoring focus when an action hides or removes the focused element, and testing the interaction without a mouse. A modal dialog is a special case: keeping focus inside while it is open can be correct, as long as people can operate and dismiss it and focus returns to a useful place.
What counts as a keyboard trap?
WCAG Success Criterion 2.1.2, No Keyboard Trap (Level A), requires that if keyboard focus can move to a page component, users can also move it away using a keyboard interface. If leaving requires more than standard keys or methods, the page must tell users how to exit. Read the W3C explanation of No Keyboard Trap.
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A component that temporarily contains focus is not automatically a failure. The important distinction is whether the containment is intentional and whether the user has an effective keyboard route to complete or leave the interaction.
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Find the trap or lost focus with a keyboard
- Start before the interaction and press Tab until focus reaches the component. Use Shift+Tab to move in reverse.
- Note where focus enters, which keys move it within the component, what happens at its apparent boundary, and whether a visible focus indicator shows the current location.
- Try the widget’s documented keyboard controls as well as Tab. Some composite widgets use arrow keys for movement within the control; custom ARIA widgets require authors to provide their keyboard support. See W3C’s guidance on developing a keyboard interface.
- Continue through the interaction that closes, hides, or changes the component. Check whether focus lands on a useful control or appears to disappear.
Decide whether focus containment is intentional
Modal dialog
While a modal dialog is open, Tab may move through its focusable controls and wrap from the last control to the first; Shift+Tab wraps in the opposite direction. This keeps keyboard focus in the active dialog rather than letting it wander behind the modal. The WAI-ARIA Dialog (Modal) Pattern describes this behavior; its modal dialog example lists Escape as a close command.
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Do not “fix” an active modal by allowing focus to move behind it. Instead, make sure its controls work, provide a usable dismissal route, and return focus sensibly when it closes.
Nonmodal component
A menu, widget, or other nonmodal component should not hold focus in a way that prevents users from reaching the rest of the page. Ensure the keyboard interaction allows an exit. If that exit uses a nonstandard method, explain it where users can find the instruction.
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Restore focus after an action
Focus can seem to vanish when an action hides or removes the element that currently has it. If the browser can no longer focus that element, it may place focus on the document body, leaving the user unsure where they are. When closing a dialog, removing a menu, or deleting a focused item, deliberately move focus to an appropriate element that remains available.
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- When a dialog closes, return focus to its invoking control if that control is still present and usable.
- If the invoking control no longer exists, choose another logical destination, such as the next relevant control in the interface.
- When deleting a focused item from a list, consider moving focus to the following item. W3C’s keyboard-interface guidance discusses focus persistence and logical destinations.
Choose native or custom dialog behavior
W3C’s HTML dialog technique describes browser-managed behavior for a modal dialog: focus moves into it, content outside is inert while it is modal, Escape dismisses it, and focus returns to the invoking element if that element remains on the page. A custom ARIA dialog needs authors to provide comparable behavior.
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| Behavior | HTML dialog |
Custom ARIA dialog |
|---|---|---|
| Focus entry and return | The W3C technique describes browser-managed focus entry and return to the invoking element if it remains present. W3C H102 | Authors must implement focus movement and a sensible return destination. W3C keyboard-interface guidance |
| Outside content while modal | Outside content is inert during modal display under the documented technique. W3C H102 | The custom implementation must prevent interaction with content behind the active modal. WAI-ARIA Dialog (Modal) Pattern |
| Keyboard containment | The documented technique includes focus within the modal. W3C H102 | Authors must implement the modal focus sequence. WAI-ARIA Dialog (Modal) Pattern |
| Escape dismissal | The documented technique describes Escape dismissal. W3C H102 | Authors must provide a keyboard dismissal path; Escape is listed in the APG modal example. WAI-ARIA modal dialog example |
| Focus-management code | The browser manages behaviors described by the technique, though the implementation still needs to use the element correctly. W3C H102 | Authors supply the equivalent focus management and keyboard interaction. W3C keyboard-interface guidance |
H102 is a documented technique, not the only way to meet WCAG. Whichever approach you use, verify the behavior in the browsers and assistive technologies your site supports.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Check the repaired interaction and focus order
- Use only the keyboard to enter the component, operate it, and leave it.
- Confirm focus remains visibly indicated as it moves.
- Close the dialog or remove the focused item, then verify focus lands on an available, logical control.
- Continue through surrounding content. WCAG Success Criterion 2.4.3 requires a sequential focus order that preserves meaning and operability; it does not have to exactly match the visual layout. See the W3C explanation of Focus Order.
These checks are an initial review, not proof of full accessibility conformance. W3C’s Easy Checks can help with a first review, alongside its broader accessibility principles.
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