Sam, Paul,
http://www.w3.org/html/wg/tracker/issues/204
Don't start breaking all of industry's implementations with hacks like
this. HTML5 does NOT control the ARIA spec.
ARIA 1.1 will have a better version of longdesc in it that is properly
specified and which will provide direction for mainstream value add.
Here is a post of an unofficial draft as ARIA 1.1 does not start until
mid-summer and because it has not gone into an ARIA specification draft.
See this post:
http://lists.w3.org/Archives/Public/public-html-a11y/2012Mar/0268.html
This post is to multiple public lists. I have stopped posting to
public-html as I have found that the editor seldom looks at it - also Paul
reads the public-html-a11y list. I will be working with user agent
manufacturers to get this implemented.
Rich
Rich Schwerdtfeger