Re: [selection-api] Need a way to get combining character status from Range or offset (#31)

There are a lots of ways to define "a combined character."

Since it's said for selections, I guess it's about extended grapheme cluster boundaries as defined in [UAX#29](http://www.unicode.org/reports/tr29/) or [CSS typographic character unit](http://dev.w3.org/csswg/css-text/#characters). Since both could be up to several length, do you expect to get a range of a single unit given a range or offset?

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