About Keyboard Navigation & Focus Trap Testing Sandbox
Simulate and verify keyboard navigation patterns following WAI-ARIA APG standards. Includes focus-trapped dialogs, arrow-key tablists, skip navigation links, and live activeElement inspector.
Key Capabilities & Features
- Live document.activeElement focus tracker
- Focus-trapped modal dialog with Escape dismissal
- Accessible WAI-ARIA arrow-key tablist widget
- Hidden skip navigation link simulator
- Custom accessible toggle switch (Space/Enter)
How to Use Keyboard Navigation & Focus Trap Testing Sandbox
Start Keyboard Nav
Press Tab on your keyboard to navigate through the interactive sandbox.
Monitor Focus
Observe the live focus indicator readout and clear outline rings.
Test Escape & Traps
Open the modal dialog and verify focus cannot escape until dismissed.
Privacy & In-Browser Execution Guarantee
All keyboard events and DOM evaluations occur entirely client-side.
Frequently Asked Questions
What is a focus trap?
When a modal dialog is open, keyboard focus must be contained inside the dialog so pressing Tab loops between its elements rather than moving behind the overlay.
What key should close a modal dialog?
WAI-ARIA APG specifies that pressing the Escape key must immediately dismiss any open modal dialog or popup, returning focus to the triggering element.
What is WCAG 2.4.7 Focus Visible?
Any keyboard operable user interface must have a mode of operation where the keyboard focus indicator (outline or ring) is clearly visible on the screen.