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This is a Public Working Draft of a document that defines the Relative Priority checkpoints in ATAG 2.0 (now a working draft) will refer to the various versions of WCAG.
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The Authoring Tools Accessibility Guidelines v2.0 (ATAG 2.0) includes five "Relative Priority Checkpoints":
These checkpoints refer to the Web Content Accessibility Guidelines (WCAG) as the "benchmark" for what constitues accessible content. However, it is important to notice that the ATAG 2.0 guidelines document, does not specify a version of WCAG with which to conform. Instead, it is left up to the evaluator to choose a whichever version of WCAG (listed in this document) is appropriate for their circumstances. This should help developers conform to ATAG 2.0, even if they have been working towards WCAG version 1.0. In addition, if future versions of WCAG are released, it will necessitate a new version of this note, rather than a new version of ATAG.
In order to be clear about which version of WCAG has been chosen for an evaluation, the version of WCAG used as the benchmark must be included in any ATAG 2.0 conformance claim. An example of an ATAG conformance statement might be:
"Authoring_tool_name conforms at Level Double-A to ATAG 2.0 with respect to WCAG 1.0.
Currently, only WCAG 1.0 is a W3C Recommendation. Another version, WCAG 2.0, has a number of improvements over WCAG 1.0, but is still in development. Developers and evaluators should be aware that these two versions of WCAG have different conformance schemes. This means there are two different ways of determining the Level of the ATAG 2.0 Relative Priority checkpoints, as described below:
Relative Priority checkpoints in ATAG 2.0, can be met with respect to WCAG 2.0 at one of the three following levels:
- Relative Priority - Level 1:
- The Relative Priority checkpoint has satisfied all WCAG 2.0 "Level 1" success criteria.
- Relative Priority - Level 2:
- The Relative Priority checkpoint has satisfied all WCAG 2.0 "Level 1" and "Level 2" success criteria.
- Relative Priority - Level 3:
- The Relative Priority checkpoint has satisfied all WCAG 2.0 success criteria ("Level 1", "Level 2", and "Level 3").
Relative Priority checkpoints in ATAG 2.0, can be met with respect to WCAG 1.0 at one of the three following levels:
- Relative Priority - Level 1:
- The Relative Priority checkpoint has satisfied all WCAG 1.0 "Priority 1" checkpoints.
- Relative Priority - Level 2:
- The Relative Priority checkpoint satisfies all WCAG 1.0 "Priority 1" and "Priority 2" checkpoints.
- Relative Priority - Level 3:
- The Relative Priority checkpoint satisfies all WCAG 1.0 checkpoints ("Priority 1", "Priority 2", and "Priority 3").