Understanding| www.w3.org
Visible focus styles help us to understand which part of a web page we may be interacting with. You may have seen visible focus styles appear as an outline around a link or a button for example. For people who only use a keyboard to navigate the web, visible focus styles may be one of the few ways to understand where they are in a page and what it is that they are interacting with.| TetraLogical
A design system is a library of styles, components, and patterns used by product teams to consistently and efficiently launch new pages and features. A good system has accessibility embedded throughout and includes documentation, guidelines and implementation notes for accessibility.| TetraLogical