What @Jellby said ;p.
There have been *massive* improvements throughout the codebase over the past 5 years, both in stuff fairly obvious to users, and to lower-level stuff.
But, yeah, being able to nerf "broken" stylesheets live, on-device, without having to bother editing the ePub on a computer is pretty much the killer feature for me (i.e., user style tweaks).
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