Interior bleed also decreases distractions such as white bars on the edges of pages where you don't need them and ink smudges on page edges where text or images were cropped. (ingramspark.com)
Add binding to double page spreads: By default the eBook is presented in iBooks with a simulated page edges which they call «binding». (circularflo.com)
Font sizes and also be changed by swiping up & down and the brightness can be changed by sliding up and down along the left page edge (all can be toggled on / off). (dearauthor.com)