How can one improve accessibility of modal windows in a browser?

1. What is modal in browser?
2. How do I make my overlay accessible?
3. How do you focus on a modal window?

What is modal in browser?

A modal (also called a modal window or lightbox) is a web page element that displays in front of and deactivates all other page content. To return to the main content, the user must engage with the modal by completing an action or by closing it.

How do I make my overlay accessible?

Accessibility overlay tools are automated software solutions that claim to detect and fix web accessibility issues. Overlay tools work by modifying the code of a web page with a snippet of JavaScript and usually come in the form of a toolbar, plugin, app, or widget.

How do you focus on a modal window?

tab, shift + tab and enter key and focus should be trapped inside modal and should not go out after pressing tab key multiple times.