Originally Posted by HarryT
No. The older Kindle Mobipocket format does NOT support CSS in any form whatsoever. The Mobi generation tools support CSS to a limited extent, but they convert that CSS into tag attributes in the generated Mobi file. There is no CSS in a Mobi file.
All my styles are obediently followed in my K3, apps, and Kindle Previewer emulations with the sole exception of drop-caps, which become up-caps and still look good. Indents, margin-top, centering, size of headings, font size, page breaks -- all that good stuff renders perfectly in the KF7 devices and apps. It hardly matters to me whether the final KF7 file actually has a style sheet or not, since it follows the CSS that I provided.
With respect to the size of an epub, I understand that it is a zip file. What I don't understand is whether the theoretical 300KB limit refers to the epub (say 150KB) or the underlying html (say 400KB). In the first case it passes, in the second case not. Which is it?