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I am finding a lot of validation errors courtesy of http://validator.w3.org/ in a clients website with the following HTML tag:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

It appears this was also used in the original version of the theme as well. I'm just wondering if I should go for a certain Doctype always over another?

  • how is it related to wordpress? This should be asked in an html oriented forum. – Mark Kaplun Dec 23 '13 at 17:38
  • I thought this initially too ,however my logic went along the lines of since I am working with different plugins that often add HTML code that I don't have easy control of - I thought there might be a good way to set a doctype that will work with HTML from different sources, etc. – fakeguybrushthreepwood Dec 23 '13 at 17:49
  • doctype is just a hint to the browser how to parse your html. just because you declare your html to be valid in a specific standard doesn't mean it is. This is even a bigger problem with UGC as users always find a way do break HTML in their content. – Mark Kaplun Dec 23 '13 at 19:20
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I think that is currently always a good idea to use the html5 doctype <!DOCTYPE html>. The best answer for use this type can you find in this SE Answer. The question and answer is not only in the context of WordPress, is always a part of serving on frontend.

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