which doctype should be used

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From	"Tony" <tony.johansson@inport.com>
Newsgroups	comp.lang.javascript
Subject	which doctype should be used
Date	Wed, 13 Mar 2013 14:17:06 +0100
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Is it any recommendation to which doctype is best to use.
Here I have two the first one is HTML 5 and the second is strict xhtml
<!DOCTYPE html>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" 
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">

//Tony

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which doctype should be used "Tony" <tony.johansson@inport.com> - 2013-03-13 14:17 +0100
  Re: which doctype should be used Danny <dann90038@gmail.com> - 2013-03-13 11:30 -0700

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