[MIDAS] How to use css:font-size instead of html:font

[Daniel Kirsch]

Hi,
I use execCommand("fontsize", false, "150%") to set font size in an 
editable Iframe within my XUL app. This results in a HTML string using 
the deprecated font element: <font size="150"> instead of something like 
<span style="font-size:150%">

How can I change that?
Well, I could replace the font element in the resulting html string, but 
that will lead to a couple of other problems when editing the same 
element again.

Any ideas are welcome.

Thanks
Daniel