With acknowledgement of existing issues (e.g. http://www.w3.org/html/wg/tracker/issues/80 ) on the topic:
Summary: Please consider simplifying authoring guidance for the <img> alt attribute, such as dropping the document is an e-mail and meta generator cases. More details provided on the wiki: http://wiki.whatwg.org/wiki/Img_Alt I encourage fellow web authors to add opinions/comments. Thanks! Tantek -- http://tantek.com/ - I made an HTML5 tutorial! http://tantek.com/html5