experience with Overdrive app on iOS devices
The Overdrive app is intended for library rentals, but you can also side load non DRM epubs and presumably others that need at Adobe ID. It has a decent reading engine that's based on webkit and also supports javascript. It has 3 options for margins, so you can come closer to the screen edge than with iBooks. One puzzlement is how you dismiss the controls at the top and bottom of the screen. A two-finger tap seems to do it, but I haven't found any description of the controls either in the app or on their website.
-Bill
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