Automattic/_s — pull request #153 by PeteSchuster (2013-02-08 18:36:32+00:00)
Title: Removed header element

Header element is used for a "group" of intro elements according to the spec, and is not necessary for a single heading element:

http://www.w3.org/html/wg/drafts/html/master/sections.html#the-header-element