If only it was that simple. Remember, that in order to do that, the eBook reader would have to process the entire book using the current settings, decompressing each and every compressed element in the book, running it through the rendering engine, and then, whenever a change was made in the formatting selected by the user (different font, different size, margin changes) this whole process would have to be repeated.
The current approach while not precise is quick and easy to compute in that all that is needed is access to the directory of the ePub file.
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