modal-focus-trap.js

VanillaJS library for trapping focus within an opened Modal, and returning focus back to the element triggering Modal.

References

• Dialog (Modal) Pattern (www.w3.org)
• Modals (Dialog Windows) (web-accessibility.carnegiemuseums.org)
• Best Practices for Modal Windows (uxmovement.com)
• Where should keyboard focus go in modals? (accessibleweb.com)
• Restoring ActiveElement Focus After A User-Interaction In JavaScript (www.bennadel.com)