Originally Posted by grannyGrumpy
I have a dozen styles with one-time use. (well, not all for top margins, but just in general). Any advice for that scenario?
Either style them with a master CSS file, or with multiple CSS files, one per each chapter.
Personally, I don't think even the weakest e-reader will have problems with a long CSS file, because it's only loaded when the chapter (the HTML or XHTML file) is loaded, not on each page turn. It can affect page turn only if the chapter is really long (over 300 KB), or chuck full of images. But this is entirely dependant on the e-reader. Some of them pre-cache the next file.