Rel and Rev in html

Hi
I can't understand the purpose of the Rel and Rev tags in html.
Are they used by browsers/search engines? and how?
Thanks
jean11Asked:
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ncooCommented:
They are not supported by any of the major browsers, they're more for search engines.

Rel:

The rel attribute specifies the relationship between the current document and the linked document.

The rel attribute is not supported in any of the major browsers.

Note: Browsers do not use this attribute in any way. However, search engines can use this attribute to get more information about a link.

Source: http://www.w3schools.com/TAGS/att_a_rel.asp

Rev:

The rev attribute specifies the relationship between the linked document and the current document.

The rev attribute is the reverse of the rel attribute.

Source: http://www.w3schools.com/tags/att_link_rev.asp
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