defunkt/jquery-pjax — pull request #316 by WojtekKruszewski (2013-09-12 12:02:20+00:00)
Title: Don't blur body element (IE compatibility)

From:
http://connect.microsoft.com/IE/feedback/details/790929/document-activeelement-blur

"If you have to remove the focus from an active element using JavaScript blur()
function, make sure that the active element is not BODY. Otherwise, if your HTML
page is the only opened tab, the IE will go to the bottom of the opened windows
stack."