Simply point your browser to the contents of the html5 folder, and you will get an HTML5 client which you can use to connect to any xpra server.

This client is usually packaged as xpra-html5 and the xpra server will normally pick it up automatically so that you can access it using the builtin web server.

Here is a xpra seamless session with an xterm and glxspheres shown running in Google Chrome:

The xpra repositories and packages already include the html5 client.
Just install xpra-html5 from there.

To install from source:

sudo apt install uglifyjs
git clone https://github.com/Xpra-org/xpra-html5
cd xpra-html5
./setup.py install

On Linux, this will install the html5 client in /usr/share/xpra/www which is where the xpra server expects to find it.

To install with Nginx or Apache, you may need to change the installation path to something like /var/www/html/.

To generate your own RPMs or DEBs, just run: ./setup.py rpm or ./setup.py deb.

Simply start an xpra session on a specific TCP port (ie: 10000):

xpra start --start=xterm --bind-tcp=0.0.0.0:10000

Then you can access this session with your browser by pointing it to that port. ie locally:

xdg-open http://localhost:10000/

For more information on xpra server options, please refer to the xpra project.

Most common HTML5 client options can be specified from the connect dialog form, which is found at /connect.html.
This screenshot shows the dialog when loaded from a proxy server which is able to populate more connection options.

Failures to connect to a server from the default page should also redirect to this connection dialog page automatically.

All of the options can also be specified as URL parameters. ie:

http://localhost:10000/?username=foo&keyboard_layout=fr

For a more complete list of options, see configuration options
The advanced options of the connection dialog exposes some of them:

This client is compatible with any currently supported version of xpra.