[giow] (3) Compatibility with deployed content.
Fixing https://www.w3.org/Bugs/Public/show_bug.cgi?id=18836
Affected topics: HTML

git-svn-id: http://svn.whatwg.org/webapps@7681 340c8d12-0b0e-0410-8428-c7bf67bfef74
[e] (0) Clarify that this is not a convention, just a possible technique for the author's own use.
Fixing https://www.w3.org/Bugs/Public/show_bug.cgi?id=18520
Affected topics: HTML

git-svn-id: http://svn.whatwg.org/webapps@7682 340c8d12-0b0e-0410-8428-c7bf67bfef74