Add .definition-table as a generic form of .propdef.

--HG--
extra : rebase_source : 5017ea70b3a99b5f5816d6bdb6975eee25e10896
[cssom-view] Remove a bogus check in scrollTop/Left getter. https://www.w3.org/Bugs/Public/show_bug.cgi?id=23453

--HG--
extra : rebase_source : 006ff8c044cb559596b67d250d0ce8e4daa12ea6