W3C says that
TITLE = "text string"
TITLE is "an advisory title for the linked
resource". The idea is that
TITLE gives a description of the linked resource that is more informative than the
<A HREF="deniseres.html" TITLE="Denise Dodd's Resume">my resume</A>
Most browsers have ignored this useful attribute. One that doesn't ignore it is
Opera. Opera displays the value of
TITLE in a small box when the pointer is over a link.
The latest version of MSIE also shows a little box over the link, but otherwise
Opera also uses the value of
TITLE as the subject line in email links:
<A HREF="mailto:firstname.lastname@example.org" TITLE="Response to Web Page">feedback</A>
It's worth noting that the ability to indicate a subject in an email link is one of the most often
requested features that
Netscape and MSIE have ignored.
Hopefully they will catch up sooner or later.