Error in button when validating W3C

Code for button:

<a href="../../logout.php" class="btn btn-danger" type="button">Log out</a>

Error when validating page:

Bad value button for attribute type on element a: Subtype missing.
LVL 1
AleksAsked:
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Ray PaseurCommented:
Unless you're using the HTML5 doctype, there is no "type" attribute for the anchor tag.  You can use CSS to style the element instead.
http://www.w3schools.com/tags/tag_a.asp
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AleksAuthor Commented:
I removed it and the button still works fine :#  ... thanks
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