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Originally Posted by Tuna
No, I'm not saying that. Where did you learn software engineering? Any update to the document is a calculable delta which can be applied to a parse tree or index directly. (trivial example - inserting text moves indices that occur later in the document by the size of the text inserted). You can apply those deltas trivially and quickly and still have a valid index.
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Unless your amazing index is really just an in memory DOM tree, there's simply no way that changing it can be faster than changing the thing that it indexes directly in memory.
Also please tell me what these browsers you worked on are, so I can go uninstall them from all my machines. Seriously, where did you learn to think?
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As for page boundaries, these are useful in any device that shows documents in page sized lumps and where the user expects to be able to go to a given page. It's a metaphor that will hang around for a very long time, not only as the one that makes sense in paper books, but also as a comprehensible measure of your location (one that makes much more sense than being 53.4% into a book!).
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Sigh! This debate has been rehashed over and over and over and I'm not getting into it with the latest straw man, go search mobile read for the previous threads on the subject.