What is the purpose of ATAG?
The point of the ATAG is to check whether the web author's experience is accessible, and if what they produce can be made accessible to end users. The ATAG guidelines frequently reference WCAG, but the two documents are distinct.
What are the four words that make up the pour acronym for WCAG?
WCAG 2.0 is based on four main guiding principles of accessibility known by the acronym POUR perceivable, operable, understandable, and robust.