In fact, there are a lot of things that I often think ebooks should be able to do that, as far as I know, they still can't. This is in danger of straying off-topic, I guess, so I'll confine myself to one. It seems obvious to me that chapter headings and subheadings should be treated differently from body-text, in the sense that, if you increase the font size on your device, that doesn't mean that you want the headings to become so large and cumbersome that a single word - "Acknowledgements", or whatever - grows so large that it goes over a single line. So, one solution (I've no idea how easy it would be to actualize) would be for headings to vary, when you change the font size, within much narrower parameters (so, for every five points the main text changes, the headings change by one point, or something); and with a hard maximum on their size, so that they don't go over a line. The handling of headings - e.g. the failure, usually, for them to be centred in kepub files even when they're originally formatted as centred - is one of the things that, I think, makes a lot of publishing-industry people basically ignore ebooks until the technology has improved.
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