I too have the same issue in the latest versions of Chrome, Firefox and Safari. Not having the <!DOCTYPE html> at the top makes the file not valid (w3 validation fails). This issue is answered here
in the forums.
af14, on 12 December 2013 - 02:21 PM, said:
This post has been edited by Spotted_Dog: 26 December 2013 - 11:10 AM