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HTML5 says (in "4.8.2.1.13 Guidance for markup generators [re: alt]") AUWG Comment: Suggest wording be synchronized with "ATAG 2.0 Guideline B.2.4". Specifically: B.2.4.3 Let user agents repair: After the end of an authoring session, the authoring tool does not attempt to repair alternative content for non-text content using text value that is equally available to user agents (e.g., the filename is not used).
EDITOR'S RESPONSE: This is an Editor's Response to your comment. If you are satisfied with this response, please change the state of this bug to CLOSED. If you have additional information and would like the editor to reconsider, please reopen this bug. If you would like to escalate the issue to the full HTML Working Group, please add the TrackerRequest keyword to this bug, and suggest title and text for the tracker issue; or you may create a tracker issue yourself, if you are able to do so. For more details, see this document: http://dev.w3.org/html5/decision-policy/decision-policy.html Status: Partially Accepted Change Description: see diff given below Rationale: I didn't use the exact text (since it doesn't quite fit the style of the HTML5 spec), but I tried to convey the same suggestion in a sentence added to the end of that section. I also added a note explaining the reasoning. Let me know if you think it should be tweaked further.
Checked in as WHATWG revision r4558. Check-in comment: Discourage also auto-generating alt text from other sources that the browsers also have access to. http://html5.org/tools/web-apps-tracker?from=4557&to=4558
The HTML Accessibility Task Force intends to track these issues, per the proposal at http://lists.w3.org/Archives/Public/public-html-a11y/2010Jan/0245.html.