[e] (0) Cleanup
Affected topics: DOM APIs, HTML, HTML Syntax and Parsing, Security

git-svn-id: http://svn.whatwg.org/webapps@7819 340c8d12-0b0e-0410-8428-c7bf67bfef74
(cherry picked from commit 987c4c92294dedb20ca3e63f7c7d902b23426e3b)
    [ac] (0) Restrict <main> from having <article> ancestors
    (FORK from WHATWG)
    Affected topics: HTML
[giow] (3) Try to kill HTMLBaseFontElement
Fixing https://www.w3.org/Bugs/Public/show_bug.cgi?id=21142
Affected topics: HTML

git-svn-id: http://svn.whatwg.org/webapps@7820 340c8d12-0b0e-0410-8428-c7bf67bfef74
(cherry picked from commit d9185428ee570dffb888626000f07eb0167b0a70)

Gecko and blink have removed HTMLBaseFontElement.
[e] (0) Cleanup
Affected topics: Canvas, HTML

git-svn-id: http://svn.whatwg.org/webapps@7821 340c8d12-0b0e-0410-8428-c7bf67bfef74
(cherry picked from commit e38d6271743c09818c94b68d034aa360006c72a3)