The Zoomify Image Viewer provides JavaScript developers detailed debugging information to support customization of the Viewer or integration into JavaScript projects. The Trace Panel displayed in this example provides access to internal values and allows toggling of visibility of the viewport display or backfill display, as well as toggling of the default pan constraint.

Use the HTML parameter zDebug=1 to enable the debug panel (simple, fast option), use zDebug=2 to enable the panel with tile loading calculations and tile name displays and tile tracing (slow, detailed option), and use zDebug=3 for tile loading calculations without tracing the loading of all tiles and without labeling all tiles (moderate option, optimal for watching tile calculations).