Web Accessibility Assessment Methodology (Level AA)
Assist with measuring conformance to the Web Content Accessibility Guidelines (WCAG) 2.0 Level A and Level AA Success Criteria.
The following are required for a Web page to satisfy a WCAG 2.0 Success Criterion:
- Web page successfully avoids each common failure of the Success Criterion.
- Web page successfully implements sufficient techniques or combinations of sufficient techniques for the Success Criterion that are:
- Specific to each applicable situation; and
- Specific to each technology that is relied upon to satisfy the Success Criterion (except where only general techniques are documented)
WCAG 2.0 Success Criteria Checklist (12 Guidelines, 38 Success Criteria)
Guideline 1.1 Text Alternatives: Provide text alternatives for any non-text content so that it can be changed into other forms people need, such as large print, braille, speech, symbols or simpler language.
Guideline 1.2 Time-based Media: Provide alternatives for time-based media.
Guideline 1.3 Adaptable: Create content that can be presented in different ways (for example simpler layout) without losing information or structure.
Guideline 1.4 Distinguishable: Make it easier for users to see and hear content including separating foreground from background.
Guideline 2.1 Keyboard Accessible: Make all functionality available from a keyboard.
Guideline 2.2 Enough Time: Provide users enough time to read and use content.
Guideline 2.3 Seizures: Do not design content in a way that is known to cause seizures.
Guideline 2.4 Navigable: Provide ways to help users navigate, find content, and determine where they are.
Guideline 3.1 Readable: Make text content readable and understandable.
Guideline 3.2 Predictable: Make Web pages appear and operate in predictable ways.
Guideline 3.3 Input Assistance: Help users avoid and correct mistakes.
Guideline 4.1 Compatible: Maximize compatibility with current and future user agents, including assistive technologies.
|Level A Success Criteria passed||/25 (%)|
|Level AA Success Criteria passed||/13 (%)|
|Total Success Criteria passed||/38 (%)|
|Success Criteria evaluated||/38 (%)|
|Success Criteria N/A||/38 (%)|
Note: The number of Success Criteria passed is the total number of PASS and N/A.
Relied upon (technologies that are)
The content would not conform if that technology is turned off or is not supported. (Source: Web Content Accessibility Guidelines (WCAG) 2.0, Appendix A: Glossary, http://www.w3.org/TR/WCAG20/#reliedupondef)
For each guideline, testable success criteria are provided to allow WCAG 2.0 to be used where requirements and conformance testing are necessary such as in design specification, purchasing, regulation, and contractual agreements. In order to meet the needs of different groups and different situations, three levels of conformance are defined: A (lowest), AA, and AAA (highest). Additional information on WCAG levels can be found in Understanding Levels of Conformance. (Source: Web Content Accessibility Guidelines (WCAG) 2.0, WCAG 2.0 Layers of Guidance, http://www.w3.org/TR/WCAG20/#intro-layers-guidance)
Sufficient and Advisory Techniques
For each of the guidelines and success criteria in the WCAG 2.0 document itself, the working group has also documented a wide variety of techniques. The techniques are informative and fall into two categories: those that are sufficient for meeting the success criteria and those that are advisory. The advisory techniques go beyond what is required by the individual success criteria and allow authors to better address the guidelines. Some advisory techniques address accessibility barriers that are not covered by the testable success criteria. Where common failures are known, these are also documented. See also Sufficient and Advisory Techniques in Understanding WCAG 2.0. (Source: Web Content Accessibility Guidelines (WCAG) 2.0, WCAG 2.0 Layers of Guidance, http://www.w3.org/TR/WCAG20/#intro-layers-guidance)
Technology (Web content)
Mechanism for encoding instructions to be rendered, played or executed by user agents
Note 1: As used in these guidelines "Web Technology" and the word "technology" (when used alone) both refer to Web Content Technologies.
Note 2: Web content technologies may include markup languages, data formats, or programming languages that authors may use alone or in combination to create end-user experiences that range from static Web pages to synchronized media presentations to dynamic Web applications.
(Source: Web Content Accessibility Guidelines (WCAG) 2.0, Appendix A: Glossary, http://www.w3.org/TR/WCAG20/#technologydef))
A non-embedded resource obtained from a single URI using HTTP plus any other resources that are used in the rendering or intended to be rendered together with it by a user agent
Note 1: Although any "other resources" would be rendered together with the primary resource, they would not necessarily be rendered simultaneously with each other.
Note 2: For the purposes of conformance with these guidelines, a resource must be "non-embedded" within the scope of conformance to be considered a Web page.
Example 1: A Web resource including all embedded images and media.
Example 3: A customizable portal site, where users can choose content to display from a set of different content modules.
Example 4: When you enter "http://shopping.example.com/" in your browser, you enter a movie-like interactive shopping environment where you visually move around in a store dragging products off of the shelves around you and into a visual shopping cart in front of you. Clicking on a product causes it to be demonstrated with a specification sheet floating alongside. This might be a single-page website or just one page within a website.
(Source: Web Content Accessibility Guidelines (WCAG) 2.0, Appendix A: Glossary, http://www.w3.org/TR/WCAG20/#webpagedef)
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