The WGAC stands for "Web Content Accessibility Guidelines (WCAG)"
These guidelines are developed through the W3C process in cooperation with individuals and organizations around the world, with a goal of providing a single shared standard for web content accessibility that meets the needs of individuals, organizations, and governments internationally.
The WCAG documents explain how to make web content more accessible to people with disabilities. Web “content” generally refers to the information in a web page or web application, including:
natural information such as text, images, and sounds
code or markup that defines structure, presentation, etc.