max
The maximum horizontal pan offset relative to the width of the ReaderView's safe area, as defined in the ReaderView's contentDisplayAreaOptions.
If this option is not specified or set to null, the value from IReaderViewOptions.gestureOptions.panZoom.maxPanOffsetHorizontal will be used.
Example: Setting it to "0%" will not allow the left side of the publication to be panned further right than the left edge of the safe area (and the opposite for the right side).
Example: Setting it to "50%" will allow the left side of the publication to be panned to the midpoint of the safe area (and the same for the right side).
Example: Setting it to "100%" will allow the publication to be panned all the way outside the safe area.
Example: Setting it to 80 CSS_PIXELS (or DEVICE_PIXELS) will not allow the left side of the publication to be panned further right than 80 CSS_PIXELS (or DEVICE_PIXELS) from the left edge of the safe area (and the opposite for the right side).