max
The maximum vertical pan offset relative to the dimensions of the ReaderView, defined as a CSS string in pixels or percentage. If a PERCENTAGE value is used, it will be based on the width of the ReaderView's width.
If this option is not specified or set to null, the value from IReaderViewOptions.gestureOptions.panZoom.maxPanOffsetVertical will be used.
Example: Setting it to "0%" will not allow the top of the publication to be panned further down than the top of the ReaderView (and the opposite for the bottom).
Example: Setting it to "50%" will allow the top of the publication to be panned to the midpoint of the ReaderView (and the same for the bottom).
Example: Setting it to "100%" will allow the publication to be panned all the way outside the ReaderView.
Example: Setting it to 80 CSS_PIXELS (or DEVICE_PIXELS) will not allow the top of the publication to be panned further down than 80 CSS_PIXELS (or DEVICE_PIXELS) from the top of the ReaderView (and the opposite for the bottom).