Some basic functionality of GenomeD3Plot is shown for a circular plot, tracks can be added/removed via the checkboxes, and resizing of the plot is enabled via a button and the dragbar in the lower right corner of the plot.
A demo of the linear plot can be found at this gist.
A demo of the circular and linear plots with their panning features linked together can be found at this gist.
Track definitions are imported via a separate json file