Quote:
Originally Posted by Barty
font-size: 1em means 100% of the value default font size (actually, the font size of the parent element, but I'm going to simplify). The "default font size" is whatever default font size the client (in this case, your ereader) decides it is. That could be 10px, 12px, whatever the programmer decides is a good default size. Of course, a good programmer lets the user change the default size to what the user likes.
So, if you, the user, set the default font size to 14px, then the next time, when you open a book and it has font-size: 1em, then it's going to be displayed as 14px. That is the correct behavior. It is not set to "1em," because "1em" is a relative value and has no meaning in itself.
I don't have a Sony, but maybe it has a global default font size value that you can set for all books, and additionally saves the font size for each individual book if you change font size in the reading screen. That would be a nice feature that most readers don't have.
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What I would expect is that if your eBook has a font size set in CSS of 1em and you want it changed, you change it. You exit the eBook and when you next go back to that eBook, the font is as you set it. But if you go into a different eBook with a font size set at .9em, you get .9em and not the size you last used. Then from there you get to change it. Now if you have an eBook that has no font specified, you can have the last used font size or an option to use the default size.
That's logical and makes a lot of sense.