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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 [https://developer.gnome.org/gtk3/stable/gtk-broadway.html 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.
Broadway GDK backend allows multiple GTK+ applications to display their windows in the same web browser, by connecting to a Broadway display server.