nesting tags in html

Reed Wade <wade@cs.utk.edu>
Message-id: <9309091557.AA29147@la.cs.utk.edu>
To: www-talk@nxoc01.cern.ch
Cc: wade@cs.utk.edu
Subject: nesting tags in html
Date: Thu, 09 Sep 1993 11:57:14 -0400
From: Reed Wade <wade@cs.utk.edu>
Status: RO


Hi,

I'm writing an HTML parser and have been looking through what
I think are the relevant docs. I'm a bit confused about what
kind of nesting is allowable in HTML. There are implications 
that it should be allowed in some case but not others.

In this example--

<h1>one <em>two</em> three</h1>
<h2>one <em>two</em> three</h2>

are the two's rendered differently? (They are in xmosaic anyway...)

Could someone explain, or point me to documentation that would
clarify?

thanks,
Reed Wade
wade@cs.utk.edu