Bruce,
If you do figure out what's going on please report back.
The code that saves the edited page deliberately strips many HTML tags and parameters. Same for the message editor. Same for the code that processes an incoming email message for display.
I'm not sure what that code looks like, but it wouldn't surprise me to learn that it is structured as a "whitelist" of things to allow. That's about the only reasonably safe way to handle user-supplied HTML code. Otherwise you run the risk of some clever crook figuring out a code sequence to exploit your web site and/or its users.
Shal
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