Re: [whatwg/dom] Range#expand() (#431)

Sorry, hit testing was a red-herring to say. I don't think AppKit does actual hit-testing. It's likely doing some magic with ICU. I said hit testing because the method is called `doubleClickAtIndex`. It doesn't go through any sort of hit testing in CSS boxes or any DOM nodes for that matter.

My point was mainly that we get a string and pass it to AppKit, and AppKit does something with it, which is completely opaque to us. So we can't really describe it in terms of ICU operations.

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