Re: [selection-api] We need to expose line direction coordinate as a property (#59)

Could you explain of meaning "line direction coordinate"?  Did you mean "inline base direction" defined in CSS writing mode spec[1]?

Caret movement and extending selection (moving focus boundary point) should follow "Abstract-to-Physical Mappings" in [1]. This implies change or specify Selection.modify() behavior.

[1] https://drafts.csswg.org/css-writing-modes/

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