[e] (0) Reframe the <img> rendering section for clarity
Fixing https://www.w3.org/Bugs/Public/show_bug.cgi?id=23443
Affected topics: Rendering

git-svn-id: http://svn.whatwg.org/webapps@8280 340c8d12-0b0e-0410-8428-c7bf67bfef74
(cherry picked from commit 5e80777aaa47d6cd0b32b00d94083ec9bee08b16)
[giow] (3) Adjust the rules on rendering images without 'alt' attributes.
Fixing https://www.w3.org/Bugs/Public/show_bug.cgi?id=23443
Affected topics: Rendering

git-svn-id: http://svn.whatwg.org/webapps@8281 340c8d12-0b0e-0410-8428-c7bf67bfef74
(cherry picked from commit 75b7b5febfacfb24dceeb33ae3568a4516767634)
[giow] (3) OnBeforeUnloadEventHandler is supposed to allow null return values (and some markup error fixes, oops)
Fixing https://www.w3.org/Bugs/Public/show_bug.cgi?id=23489
Affected topics: DOM APIs, Rendering

git-svn-id: http://svn.whatwg.org/webapps@8282 340c8d12-0b0e-0410-8428-c7bf67bfef74
(cherry picked from commit 3927ececc1acf2ad86e53cd909430ed049c9e45c)