WCAG 2.1 stands for Web Content Accessibility Guidelines.
The standard that Danish web accessibility legislation follows is called WCAG (Web Content Accessibility Guidelines). The WCAG standard rests on four core principles.
A website must be: 1) perceivable, 2) operable, 3) understandable, and 4) robust.
The four principles are broken down into 13 guidelines, each with its own success criteria, against which accessibility is measured.