When building a Shakespeare play as a re-flowable ePUB3, one important design choice will be the display of the character names in relation to the words they speak.
In published works of the play this varies a lot and you can see here how the play was presented in the first folio.
The real issue for us is to try to achieve the arrangment of elements using InDesign, so that a print version may be possible as well as an eBook version from the same file. So what are the options?
BBEdit version 10 has the ability to open the contents of an ePUB file. You can edit the individual components of the ePUB - which, of course is actually a ZIPped file, and then re-save.