This repository was a clone of the xpra HTML5 client found here: xpra.org. You can also browser the source here through xpra's tracker which has the advantage of showing links for commits and tickets.
Please use xpra's bug tracker instead: bug tracker
To use it, you will need an xpra server, which you can start with:
xpra start --bind-tcp=0.0.0.0:10000
Then you can just point your browser to port 10000.
There is also an online version of the current version of the HTML5 client available here: current HTML5 client (the server not supplied!).
For more information on using xpra, see xpra usage