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Title: The Broadway windowing system Slug: broadway

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, first run the broadway server, gtk-broadwayd, that ships with GTK:

gtk4-broadwayd :5

The server expects the colon-prefixed display number as a commandline argument.

Then point your web browser at http://127.0.0.1:8085.

Once the Broadway server is running, you can start your applications like this:

GDK_BACKEND=broadway BROADWAY_DISPLAY=:5 gtk4-demo

Multiple applications can be presented in the same web browser window.

Broadway-specific environment variables

BROADWAY_DISPLAY

Specifies the Broadway display number. The default display is 0.

The display number determines the port to use when connecting to a Broadway application via the following formula:

port = 8080 + display