Re: [editing-explainer] What browser internals can be exposed to help us move the caret in (and against) the block direction? (#56)

@kojiishi It depends a bit on whether or not to implement up/down (in European text) movement entirely in the JS. Initially, I thought that's the way we would go, but then @rniwa's comments made me think that maybe we shouldn't  do that anyway.

If we implement it entirely in JS, the thing that is somewhat complex is to find out what the carets current line-start offset is, what is in the next/last line at offset X, and if offset X is longer than the entire line, what the last possible position in that line is.

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