You can do the rendering, even within an iframe, on iOS (where iframes have an amazing quirk of resizing automatically) without messing with scrolling (both vertical velocity and horizontal swipes) and breaking the browser's on-page search (which is extremely annoying); in fact, it is so easy to pull this stuff off on iOS (again: in no small part due to the epic iframe quirk) that it kind of comes off like you just don't care.