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semantic markup - Use of profile attribute in HTML head tag

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semantic markup - Use of profile attribute in HTML head tag

What is the use of profile attributes in the HTML <head> tag?

I happened to read about it in here : http://www.w3schools.com/tags/tag_head.asp.

I could not understand this(http://www.w3.org/2002/12/namespace) either, since it is too technical (for me).

I have never used it. What is the purpose it serves?

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The URI in the profile attribute points to a document containing information regarding metadata. Profiles defines properties that may be used by the HTML meta tag and the HTML link tag. There are no prescribed formats for profiles. The profile attribute is no longer supported in HTML 5.


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