Re: [selection-api] caret-based selection movement (#27)

I don't think a Web developer should have any expectation as to how a caret moves in response to a given key down/press.  It would be entirely platform dependent.  Ben's Responsive Input Events should solve the use case you're talking about by providing a new selection/range before the selection is actually changed.  A Web site/app can inspect and adjust this new range before it is actually set.

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