- From: Laura Carlson <laura.lee.carlson@gmail.com>
- Date: Mon, 1 Mar 2010 13:44:40 -0600
- To: HTML Accessibility Task Force <public-html-a11y@w3.org>
- Cc: Steve Faulkner <sfaulkner@paciellogroup.com>, Gez Lemon <gez.lemon@gmail.com>, Matt Morgan-May <mattmay@adobe.com>, "Gregory J. Rosmaita" <oedipus@hicom.net>, Janina Sajka <janina@rednote.net>, Maciej Stachowiak <mjs@apple.com>
Hi All, Maciej has asked me [1] to provided bugs for the differences between Ian's draft and the text in the Change Proposal that I drafted to implement WAI CG’s text alternative consensus document. http://www.w3.org/html/wg/wiki/ChangeProposals/ImgElement20090126 Providing bugs for these is probably not required as Issue 31 predates the HTML WG decision policy. And bugs were never filed for similar accessibility issues. But I think it is good to do it anyway to give Ian the complete opportunity to address and fix the problems. So I’ve been working on drafting bugs and need your help and expertise. When you get a chance could you please give me advice on the following? Many thanks to Gez for already doing so. He provided great input. Background info: Ian recently changed the conformance section for images in the HTML5 draft to the following (I replaced the * bullets with numbers for easier referencing): <q cite="http://dev.w3.org/html5/spec/text-level-semantics.html#guidance-for-conformance> 4.8.1.1.14 Guidance for conformance checkers A conformance checker must report the lack of an alt attribute as an error unless one of the conditions listed below applies: 1. The title attribute is present and has a non-empty value (as described above). 2. The img element is in a figure element that contains a figcaption element that contains content other than inter-element whitespace (as described above). 3. The img element is part of the only paragraph directly in its section, and is the only img element without an alt attribute in its section, and its section has an associated heading (as described above). 4. The conformance checker has been configured to assume that the document is an e-mail or document intended for a specific person who is known to be able to view images. 5. The document has a meta element with a name attribute whose value is an ASCII case-insensitive match for the string "generator". (This case does not represent a case where the document is conforming, only that the generator could not determine appropriate alternative text - validators are required to not show an error in this case to discourage markup generators from including bogus alternative text purely in an attempt to silence validators.) </q> The change proposal that I drafted to implement WAI CG's advice [3] "Replace img Guidance for Conformance Checkers" says: <q cite="http://www.w3.org/html/wg/wiki/ChangeProposals/ImgElement20090126"> A conformance checker must report the lack of a text alternative as an error. The img element is only valid when at least one of the following is true: * alt is present (empty or non-empty) OR * @aria-labelledby is present (non-empty only) OR * the <img> is located within a <figure> that has a non-empty <figcaption> OR * @role="presentation" OR * <img> has an attribute other than alt whose value is an ASCII case-insensitive match for the string "generator" OR * <img> has a "missing" attribute. </q> The other relevant section of the HTML5 spec is "Images whose contents are not known" http://dev.w3.org/html5/spec/text-level-semantics.html#unknown-images Current Status and Advice Needed From A11y Task Force Members: There are some bugs in various stages and some may need to be created. 1. Steve has a WONTFIX bug for title, so we already have a bug for this item: http://www.w3.org/Bugs/Public/show_bug.cgi?id=7362 2. Simon Pieters has a CLOSED (duplicate) bug for <img aria-labelledby>, so a bug exists for this item. The duplicate Bug 8171 is in the NEEDSINFO state. I provided a general comment (4). Does anything more need to be provided for img aria-labelledby? http://www.w3.org/Bugs/Public/show_bug.cgi?id=6496 http://www.w3.org/Bugs/Public/show_bug.cgi?id=8171 3. Gez has a WONTFIX bug for the e-mail issue, so we already have a bug for this item: http://www.w3.org/Bugs/Public/show_bug.cgi?id=8646 4. I think figcaption is okay and probably doesn't need a bug unless anyone thinks differently. 5. Do we want a bug for Ian's number 3 "img element is part of the only paragraph..."? Gez recommended we do, as he is not sure how a conformance checker would find that, and doesn’t follow the rationale that the alt text is presentational and the paragraph provides the context for it. Any suggestions for bug text? 6. Although I personally disagree with it being a valid option, I've drafted bug for the generator mechanism for img from document level to element level as WAI CG said that they would condone it: http://www.w3.org/WAI/PF/HTML/wiki/Bugs/Generator Any suggested text or ideas to improve the bug text? 7. Although I personally disagree with it being a valid option, I've drafted bug for a missing attribute, as WAI CG said that they would condone it. Matt’s crowdsourcing idea is intriguing if it could be implemented it would be great. The bug is at: http://www.w3.org/WAI/PF/HTML/wiki/Bugs/Missing Any suggested text or ideas to improve the bug text? 8. I've drafted bug to enable automatic validators to programmatically determine the presence or absence of a set of text alternatives as HTML4 did with alt: http://www.w3.org/WAI/PF/HTML/wiki/Bugs/ProgrammaticallyDetermineTextAlternatives Any suggested text or ideas to improve the bug text? 9. I've drafted bug for role="presentation" on img. http://www.w3.org/WAI/PF/HTML/wiki/Bugs/role=%22presentation%22 Any suggested text or ideas to improve the bug text? 10. I've drafted bug for CAPTCHAs http://www.w3.org/WAI/PF/HTML/wiki/Bugs/CAPTCHA Any suggested text or ideas to improve it? I have also filed a bug with Steve (and he agreed) to provide and example in his document. http://www.w3.org/Bugs/Public/show_bug.cgi?id=9169 11. I've drafted bug for Webcams http://www.w3.org/WAI/PF/HTML/wiki/Bugs/Webcam Any suggested text or ideas to improve it? I have also asked Steve to provide and example in his document. http://www.w3.org/Bugs/Public/show_bug.cgi?id=9174 If you have suggested text or ideas for improvement on these bugs, please let me know soon, as I would like to file them mid-week. Thank you very much. Kindest Regards, Laura [1] http://lists.w3.org/Archives/Public/public-html/2010Feb/0803.html [2] Thread HTML5 Change Proposal to "Replace img Guidance for Conformance Checkers" [3] http://www.w3.org/2009/06/Text-Alternatives-in-HTML5 Directly Related Bug "implement the text alternatives proposal from WAI": http://www.w3.org/Bugs/Public/show_bug.cgi?id=8171 -- Laura L. Carlson
Received on Monday, 1 March 2010 19:45:14 UTC