Toggle Metadata visibility

>From HTML-A11Y call: there was a discussion about toggling the visibility of
@summary in UA [1]

Should add 'summary' to examples in 3.1.1

3.1.1 Notification of Alternative Content: Provide a global option for the
user to be notified of alternatives to rendered content (e.g., short text
alternatives, long descriptions, captions).

3.1.2 Configurable Default Rendering: Provide the user with the global
option to set which type of alternative to render by default. If the
alternative content has a different height and/or width, then the user agent
will reflow the viewport. (Level A)

Also, the concept of "the UA should have a mechanism to allow the user to
reveal human usable metadata (alt, summary, titles, etc.). At one time we
had discussed having the content and alternatives displayed simultaneously. 

<old> 3.2.4 Simultaneous Rendering: The user has the option to
simultaneously
render any and all items from the alternative content stack (which will
cause the document to reflow accordingly) unless the user agent can
recognize a mutual exclusion (e.g. conflicting soundtracks).[2]</old>

3.2.4 was later removed, because I/we could not come up with a use case [3].
However, @summary and other 'human metadata' present a good case for
reviving this success criteria. The @summary is intended to provide
additional information to aid in the comprehension of the TABLE, not as a
replacement of the TABLE. 
Note: due to editing of the draft these items would now appear under
Guideline 3.1...which is still pretty rough.

1. http://www.w3.org/2009/12/17-html-a11y-minutes.html
2. http://lists.w3.org/Archives/Public/w3c-wai-ua/2008AprJun/0126.html
3. http://lists.w3.org/Archives/Public/w3c-wai-ua/2008OctDec/0055.html

Received on Thursday, 17 December 2009 17:24:16 UTC