Problems with formatting html text using gw or gq

I'm using vim 7.2.402 on Win XP. I have following text with
set tw=72
--------------------
<p><a href="intro.html">aaaaaaa aaa aa aaa aaaa, aa aaaaa
bbbbbbbbb - bb bbbbbbbbbbb bb bb bbbbbbbbbbbbbbbbbbbb - bb
cccc ccccccccc ccccccccccccccccccccc cc ccc cccccc ccc ccccccc
dddddddd dd dddd dddddddd d ddddddddddd. dd ddddd, dd ddddd
ee ee eeeeeeeeeee eee eeeeeeeeee e ee eeee eee eeeeeee eeee
ff fffff fff ffff, ff fffff ff ffffffffff ... ffffffff
ggggggg ggggggg</a>
--------------------

If I visually select the text and do gw or gq, and
set ft=xhtml or html I get:
--------------------
<p><a href="intro.html">aaaaaaa aaa aa aaa aaaa, aa aaaaa bbbbbbbbb -
bb bbbbbbbbbbb bb bb bbbbbbbbbbbbbbbbbbbb - bb cccc ccccccccc
ccccccccccccccccccccc cc ccc cccccc ccc ccccccc dddddddd dd dddd
dddddddd d ddddddddddd. dd ddddd, dd ddddd ee ee eeeeeeeeeee eee
eeeeeeeeee e ee eeee eee eeeeeee eeee
ff fffff fff ffff, ff fffff ff ffffffffff ... ffffffff ggggggg
ggggggg</a>
--------------------

Notice that the antepenultimate line isn't formatted correctly.
That doesn't happen if I set ft=text or leave it empty.
Many thanks in advance.

--
Cesar

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