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

Re "determine the next position in the given direction in the current text node if it exists":
– How closely can and should "next position" be specified? Is there any agreement between current implementations what the increment, say, in Indic text (स्वागतम्) or in a sequence of regional indicators (🇩🇪🇺🇸🇯🇵) should be?
– This should mention that the "direction" is not necessarily the one that's printed on the arrow key being pressed, but may depend on writing direction and writing mode in a platform-dependent way.

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https://github.com/w3c/selection-api/issues/27#issuecomment-66746717