• View HTTP and HTML Source
  If you have a suspicion that a page is not being served with the correct content-type (HTML being displayed as plain text in the browser and stylesheets not rendering in Mozilla are common symptoms of this) a good way of checking is to use this page:
  view request and response header of a HTTP connection and HTML source
  apache bom browser byte charset header html idn mark order punycode unicode utf-8 web webserver
  in Public bookmarks with bugchecking html http mozilla source webtools by 2 users

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