The last days I have encountered a problem in IE where it seemed as if some parts of my CSS was not loaded.
I pursued the issue down. So it seems to be a size limit of ~ 288Kb for a CSS file.
In IE only the first in a 288Kb file will be read and processed. Each CSS to 288Kb will be ignored.
In this particular case I was loading a CSS file of 347Kb.
Firefox and other browsers seem to have no limit.
The border seems to be a "per-file limit. You can use the CSS divided into two files and it will work.
You might ask yourself why you would ever have a CSS file, 347Kb is? Good question ... But we have a large file to use in our website design application.
The CSS ends up being gzipped and is only 45kb, when you download it when loading the designer.