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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 six checkpoints (designated "Relative Priority Checkpoints") that refer to the Web Content Accessibility Guidelines (WCAG) as a benchmark for what constitutes accessible Web content. However, in order for ATAG 2.0 to remain up-to-date, even as new versions of WCAG are released, these references do not specify a particular WCAG version number. This means that developers and evaluators will have to decide for themselves which version of WCAG to use (the most recent version is recommended). When making an ATAG 2.0 conformance claim, the version of WCAG used as the benchmark must be included. For example:
"Product X conforms at Level Double-A to ATAG 2.0 with respect to WCAG 2.0.
In order to use a particular version of WCAG as a benchmark for the Relative Priority Checkpoints in ATAG 2.0, developers and evaluators must be aware that the different versions of WCAG have different Priority schemes that in turn require different ways of determining the Level of the ATAG 2.0 Relative Priority Checkpoints.
In contrast to WCAG 1.0, WCAG 2.0 establishes three "levels of implementation" for each of its checkpoints: Minimum (most important requirements met), Level 2 and Level 3 (least important requirements met). The ATAG 2.0 relative priority level with respect to WCAG 2.0 is determined as follows:
- Relative Priority 1:
- The Relative Priority checkpoint satisfies all applicable WCAG 2.0 checkpoint requirements to at least the minimum level.
- Relative Priority 2:
- The Relative Priority checkpoint satisfies all applicable WCAG 2.0 checkpoint requirements to at least level 2.
- Relative Priority 3:
- The Relative Priority checkpoint satisfies all applicable WCAG 2.0 checkpoint requirements to level 3.
(2) WCAG Checkpoint Applicability:
WCAG 1.0 established three priority levels with each checkpoint assigned to one of these levels. THe priority levels are Priority 1 (most important requirements), Priority 2 and Priority 3 (least important requirements). The ATAG 2.0 relative priority level with respect to WCAG 1.0 is determined as follows:
- Relative Priority 1:
- The Relative Priority checkpoint satisfies all applicable WCAG 1.0 Priority 1 checkpoints.
- Relative Priority 2:
- The Relative Priority checkpoint satisfies all applicable WCAG 1.0 Priority 1 and 2 checkpoints.
- Relative Priority 3:
- The Relative Priority checkpoint satisfies all applicable WCAG 1.0 checkpoints.