What Is WCAG?
The Web Content Accessibility Guidelines (WCAG) provide a framework for achieving usability, with three levels of compliance: A, AA, and AAA. Each level includes guidelines for areas such as text alternatives, captions and transcripts, headings, forms, color contrast, and keyboard-user considerations.
WCAG Level A
Level A is the most basic level, and includes guidelines that focus on ensuring that all web content is perceivable, operable, and understandable. This includes providing text alternatives for images, ensuring that links are identified with text descriptions, and providing captions or transcripts for audio or video.
WCAG Level AA
Level AA builds upon the requirements of level A by adding additional requirements such as using headings to help organize content into a logical structure, providing keyboard usability to all functionality, and maintaining a sufficient contrast ratio between foreground and background colors.
WCAG Level AAA
Level AAA is the highest level of compliance and provides recommendations for more comprehensive ADA usability. This includes using sufficiently descriptive link phrases instead of "click here", adding language attributes to HTML elements to identify different languages used in a web page, fitting complex tables into smaller screens without losing data or context, and making sure that there are no instances where users are locked out due to time limits or an inability to complete a task within a certain amount of time.