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The font size, if specified will be honored and most implementations will not override it but some may. It is a bad idea to specify specific font sizes for this reason. Much better to specify relative font sizes. It is one of those things that is a bit messy in ePUB depending on who you think should be in control of the presentation of data. In some cases the implementation may get the units wrong interpreting points as pixels for example. Sony gets this right.
Font typeface is another area that is often implemented poorly in ePUB. The standard lets you specify but the implementation may not support it. In particular ADE seems to have its own notion of fonts. CSS can specify the fonts to use explicitly but most of the time the system cannot find them and will use its own. It is better to use generic names for typefaces rather than specific type font. There is no standard place to put fonts and if the CSS defines an exact place it will likely work in only one system. It is also possible to embed fonts by putting them in the epub file itself. However, you would need to ensure that it was legal for you to distribute the fonts in that case since fonts themselves may be copyrighted. In some cases you can distribute them by encrypting the fonts you embed. There is a defined system (actually two) for doing that. But again the rendering system may not support the way you did it.
Dale
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