[Typo3] external css + default RTE

[tapio]

tapio wrote:
> Artiom Lunev wrote:
> 
>> hi,
>> can I include into default RTE external css file?
>> (like RTE.default.contentCSS = fileadmin/css/editor.css in htmlArea)
>>
>> Regards,
>> Artiom.
> 
> 
> Presumably it needs to change some core files to do that.
> Htmlarea has a css-file in the folder /htmlarea/DynamicCSS/
> 
> If you put for example
> 
> @import url(../../../fileadmin/template/css/styles_for_the_site.css);

that is not the correct relation (needs more '../'), but when I tested
with full (starting 'http://') or relative path to another folder Typo3 
crashed.

I must copy the needed css-file to the folder  /htmlarea/DynamicCSS/