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From: Glenn Morris <rgm+news@stanford.edu>
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Subject: Re: displaying subscripts and superscripts
Date: Mon, 19 Apr 2010 16:29:44 -0700
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Stefan Monnier wrote:

>> (defun suscript-height (height)
> [...]
>> (defface superscript
>>   '((t :height suscript-height))
>>   "Face used for superscripts.")
>
> The :height attribute cannot be a function. 

Err, tex-mode.el uses a function for :height, and it seems to work...

The elisp manual says :height can be a function.