positionAnchor

The cue anchor positioned by fractionalPosition. One of AnchorType.AnchorTypeStart, AnchorType.AnchorTypeMiddle, AnchorType.AnchorTypeEnd and AnchorType.TypeUnset.

For the case of horizontal text, AnchorType.AnchorTypeStart, AnchorType.AnchorTypeMiddle and AnchorType.AnchorTypeEnd correspond to the left, middle and right of the cue box respectively.