[e] (0) Make tutorial match actual requirements.
Fixing https://www.w3.org/Bugs/Public/show_bug.cgi?id=19491
Affected topics: HTML, Workers

git-svn-id: http://svn.whatwg.org/webapps@7663 340c8d12-0b0e-0410-8428-c7bf67bfef74
[e] (0) Reword 'self-contained' using another word that the dictionary says means essentially the same thing, to help readers figure this out.
Affected topics: HTML

git-svn-id: http://svn.whatwg.org/webapps@7664 340c8d12-0b0e-0410-8428-c7bf67bfef74
[e] (0) Cleanup
Affected topics: HTML

git-svn-id: http://svn.whatwg.org/webapps@7665 340c8d12-0b0e-0410-8428-c7bf67bfef74