The ADA guidelines provide the foundation that organizations need to achieve digital accessibility best approaches, however they are not exhaustive. They do not provide direction for all of the accessibility challenges that people with disabilities face. They also fail to provide detailed technical instructions. With these limitations in mind, there is a ray of hope.
The guidelines are broken down by four main principles: perceivable, operable, understandable, and robust. Under each principle, there are guidelines that provide specific goals a website should work toward. Under each guideline, there are testable success criteria. Those criteria are graded A, AA, or AAA. This grade shows the level of conformity to accessibility, AAA being the highest. The law only requires A and AA guidelines to be met.