8.11 WCAG 2.1 Success Criterion 2.1.2 − No Keyboard Trap

Often people with disabilities can only use a keyboard to control a webpage. Ensure the keyboard can be used to control or dismiss dialogue boxes, popups or other windows.

Before Rectification

Websites often have popup windows, such as for help content as shown in this example. A keyboard user may become trapped in the popup without an easy way to return to the main content.

After Rectification

By incorporating a Close button in the popup window, users can escape the trap of that window by using the Tab key to move to the Close button and press Enter.

WCAG 2.1 Reference:

https://www.w3.org/WAI/WCAG21/Understanding/no-keyboard-trap