The most frustrating thing is that in some areas ADE (also known as RMSDK) still has some of the best typography amongst ebook rendering engines. Kerning? Yes.

The most frustrating thing is that in some areas ADE (also known as RMSDK) still has some of the best typography amongst ebook rendering engines. Kerning? Yes. Ligatures? Of course. (Adjustable) hyphenation? Absolutely. Line breaking that's more complex than the first-fit that web browsers use? Well, yes, I think they may have borrowed it from InDesign. And then it's let down by it's awful CSS support. No `font-variant: small-caps` for you. And your CSS had better be valid, or it will be completely ignored - that includes `!important` by the way. Adobe essentially abandoned the RMSDK renderer, which is a real shame, because with better CSS support, it would still kick-ass. As an aside on Kobo ereaders, they use RMSDK to open standard EPUB ebooks. Only their "Kobo EPUB" format is rendered using a webkit based engine.