alt attribute is for some elements (images, buttons), that might not be fully rendered by browsers. should be visible only when element itself is not shown.
title attribute is for almost every element in html. it is supposed to give additional information. optionally visible, usually as a tooltip or on status bar.
<img src="photo" alt="me and my dog" title="this one was taken last holiday" />
<a href="blah.com" title="blah yourself">
<abbr title="World Wide Web">WWW</abbr>
-- regards, Kornel Lesiński
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