The scroll viewer technology used in this website is an extension of the standard Seadragon JavaScript image viewer named HandscrollViewer.  HandscrollViewer is optimized to provide a high-level API for viewing very wide Asian handscroll images correctly and with needed additional features.

Below is a list of the optimizing features:

• Initial display and Home start at the right edge of the image (per handscroll tradition)
• The navigation control image with a fixed usable height
• Horizontal auto scroll with custom scroll speed control
• Optional annotation addition and control for specific images
• Annotation creation aide
• Standardized user interface including custom buttons and navigation control
• Image and annotation information are specified in separate metadata for ease of updating
• Standard OpenSeadragon functionality (zoom in and out, image drag, full screen mode, etc.) still fully available

The HandscrollViewer source and associated documentation is available in a public open-source project on GitHub (https://github.com/charlescrable/HandscrollViewer-OpenSeadragon-Extension).