El número de criterios de conformidad de las diferentes versiones de WCAG 2.x es:
| Versión | A | AA | A + AA | AAA | Total |
|---|---|---|---|---|---|
| 2.0 (11/12/2008) |
25 | 13 | 38 | 23 | 61 |
| 2.1 (5/6/2018) |
30 | 20 | 50 | 28 | 78 |
| 2.2 (5/10/2023) |
31* | 24 | 55 | 31 | 86* |
* WCAG 2.2 añade dos criterios nuevos de nivel A, pero elimina uno (4.1.1 Parsing), tal como se explica en Comparison with WCAG 2.1:
WCAG 2.2 builds on and is backwards compatible with WCAG 2.1, meaning web pages that conform to WCAG 2.2 are at least as accessible as pages that conform to WCAG 2.1. Requirements have been added that build on 2.1 and 2.0. WCAG 2.2 has removed one success criterion, 4.1.1 Parsing. Authors that are required by policy to conform with WCAG 2.0 or 2.1 will be able to update content to WCAG 2.2, but may need to continue to test and report 4.1.1.
Y en Success Criterion 4.1.1 Parsing (Obsolete and removed):
This criterion was originally adopted to address problems that assistive technology had directly parsing HTML. Assistive technology no longer has any need to directly parse HTML. Consequently, these problems either no longer exist or are addressed by other criteria. This criterion no longer has utility and is removed.
