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Geoff is exactly correct. Unless your audience is captive (all intranet
users running IE 5.0, or some such), it's best to forget about supporting
browser specific tags. Yes, it is possible to tailor your page (using java)
to the user's specific browser, but why? You're creating three times (at
least) the work for yourself.
There are too many different choices: Internet Explorer, Navigator, Opera,
and on and on and on. If you start to take into account monitor size and
resolution, connection speed, etc., you'll spend years optimizing your HTML
for every possible combination.
My advice: stick to "plain vanilla" HTML. A good source for info is the
World Wide Web Consortium's site at w3c.org. There's also an excellent book
titled: _Mastering HTML 4_ authored by Techwhr's own Debbie and Eric Ray.