WCAG 2.2 defines conformance requirements for individual web pages (and in some cases, sets of web pages), but does not describe how to evaluate entire websites. It also defines how to make optional conformance claims to cover individual web pages, a series of web pages such as a multi-page form, and multiple related web pages such as a website. This applies when all web pages that are in the scope of a conformance claim have each been evaluated or created in a process that ensures that they each satisfy all the conformance requirements.
WCAG 2 conformance claims cannot be made for entire websites based upon the evaluation of a selected sub-set of web pages and functionality alone, as it is always possible that there will be unidentified conformance errors on these websites. However, in the majority of uses of this evaluation methodology only a sample from a digital product is selected for evaluation. Thus, in the majority of situations, using this methodology alone does not result in being able to make WCAG 2 conformance claims. Guidance on making statements about the outcomes from using this methodology is provided in Step 5.3: Provide an Evaluation Statement (Optional).