Form control appearance

Hi,

 

I am just learning about XForms and I wonder how much control the XForms
author has over the appearance of a form control.

 

It seems the appearance attribute can have a few pre-defined values
(full/compact/minimal) or some user-defined value. How do I control the
interpretation of these values?

 

We currently have an HTML form in which we use some Javascript in place
of the standard select form control. We do this to get a customized look
and feel for the select drop-down. How do I create customized appearance
if we migrate to XForms?

 

Thanks in advance,

Xiao Ma