There are four provisions that particularly deal with issues of interference with use of the page.
Technologies that are not accessibility supported can be used, or technologies that are accessibility supported can be used in a non conforming manner, as long as all the information is also available using technologies that are accessibility supported, in a manner that does conform, and as long as the non-accessibility-supported material does not interfere. This basically says that technologies that are not accessibility supported can be used, as long as all the information is also available using technologies that are accessibility supported and as long as the non-accessibility-supported material does not interfere. In addition, the following success criteria apply to all content on the page, including content that is not otherwise relied upon to meet conformance, because failure to meet them could interfere with any use of the page:Ģ.3.1 - Three Flashes or Below Threshold, and When any technology that is not relied upon is not supported by a user agent When any technology that is not relied upon is turned off in a user agent, and When any technology that is not relied upon is turned on in a user agent, In addition, the Web page as a whole continues to meet the conformance requirements under each of the following conditions: Technologies are used in a way that is not accessibility supported, or if they are used in a non-conforming way, then they do not block the ability of users to access the rest of the page. For example creating an equivalent to a user interface control. Alternatives can also be provided on the same page. This makes it clear that such content is considered part of the Web page, so that requirement #2 is satisfied for the combined set of Web pages considered as a single Web page. With longdesc, a long description of a graphic might be on a separate page that the user can jump to from the page with the graphic. The longdesc attribute in HTML is an example. Sometimes, supplemental information may be available from another page for information on a page. Statements about "part of a page conforming" cannot be made. This provision simply requires that the whole page conform. Understanding Requirement 2įor the purpose of determining conformance, alternatives to part of a page's content are considered part of the page when the alternatives can be obtained directly from the page, e.g., a long description or an alternative presentation of a video.Īuthors of Web pages that cannot conform due to content outside of the author's control may consider a Statement of Partial Conformance. See also Understanding Conforming Alternate Versions which includes techniques for providing Conforming Alternate Versions. The note points out that authors are encouraged to go beyond conformance to a particular level and to complete, and report if they desire, any progress toward higher levels of conformance. The requirement also explains that no conformance is possible without at least satisfying all of the Level A Success Criteria. It basically says that all information on a page conforms or has a conforming alternate version that is available from the page. The first requirement deals with the levels of conformance. It is not recommended that Level AAA conformance be required as a general policy for entire sites because it is not possible to satisfy all Level AAA Success Criteria for some content. Although conformance can only be achieved at the stated levels, authors are encouraged to report (in their claim) any progress toward meeting success criteria from all levels beyond the achieved level of conformance.
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