It would be convenient to change the line width of epub files.
There is a reason that blogs and scientific papers don’t spread their text all the way across the screen and it’s because it’s hard to read since your eyes have travel such a long distance, then back, and repeat. It’s also easier to get lost in the text that way.
They instead choose to constrain the text into a smaller single, double, or triple column layout.
Would it be possible to do something like this for epub files?