Returns the marker at this position, in the backward direction (i.e., the marker to the left of the cursor if the cursor is on a marker boundary and text is left-to-right)
Returns the marker in direction from this position.
If the position is in the middle of a marker, the direction is irrelevant.
Otherwise, if the position is at a boundary between two markers, returns the
marker to the left if direction === BACKWARD and the marker to the right
if direction === FORWARD (assuming left-to-right text direction).
Move the position 1 unit in direction.
Return a new position one unit in the given direction. If the position is moving left and at the beginning of the post, the same position will be returned. Same if the position is moving right and at the end of the post.
to move. > 0 moves right, < 0 moves left
Returns a range from this position to the given tail. If no explicit tail is given this returns a collapsed range focused on this position.
Optional tail: Position = ...The ending position
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A position is a logical location (zero-width, or "collapsed") in a post, typically between two characters in a section. Two positions (a head and a tail) make up a Range.