Don't change doctype unless you are SURE that every element of every generated page is guaranteed to create HTML of the doctype you specify.
And quite frankly, it looks like you wouldn't know where to begin on this massive task.
Leave DocType as it is - even in wordpress. You did not develop the program, so leave the doctype statements to the people who HAVE developed the program, and trust that it is the correct statement for the program and version you are running.




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