[e] (0) try to add a cross-reference at the dfn of 'do not apply' to link people to where those terms are used
Fixing https://www.w3.org/Bugs/Public/show_bug.cgi?id=23413
Affected topics: DOM APIs, HTML

git-svn-id: http://svn.whatwg.org/webapps@8309 340c8d12-0b0e-0410-8428-c7bf67bfef74