text alternatives standalone draft

here is an updated draft of the alt text standalone doc I have been
threatening to prepare but not actually delivered on until now.

Its still needs a little work, but is almost ready. This is intended to be
published as a note.

HTML5: Techniques for providing useful text alternatives

W3C Editor's Draft 20 April 2014

http://rawgit.com/w3c/alt-techniques/master/index.html

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Regards

SteveF
HTML 5.1 <http://www.w3.org/html/wg/drafts/html/master/>