Using GTK+ with Broadway: GTK+ 3 Reference Manual

## Using GTK+ with Broadway Using GTK+ with Broadway — HTML-specific aspects of using GTK+ |

## Using GTK+ with Broadway

The GDK Broadway backend provides support for displaying GTK+ applications in a web browser, using HTML5 and web sockets. To run your application in this way, select the Broadway backend by setting `GDK_BACKEND=broadway`. Then you can make your application appear in a web browser by pointing it at `http://127.0.0.1:8080`. Note that you need to enable web sockets in your web browser.

You can choose a different port from the default 8080 by setting the `BROADWAY_DISPLAY` environment variable to the port that you want to use.

It is also possible to use multiple GTK+ applications in the same web browser window, by using the Broadway server, broadwayd, that ships with GTK+. To use broadwayd, start it like this:

    broadwayd :5

Then point your web browser at `http://127.0.0.1:8084`. Start your applications like this:

    BROADWAY_DISPLAY=:5 gtk3-demo

### Broadway-specific environment variables

`BROADWAY_DISPLAY`. Specifies the Broadway display number. The default display is 1. The display number determines the port to use when connecting to a Broadway application via the following formula:

            port = 8080 + (display - 1)