Gtk.CssProvider.prototype.load_from_data

function load_from_data(data:[guint8]):Boolean {
    // Gjs wrapper for gtk_css_provider_load_from_data()
}

Loads data into css_provider, making it clear any previously loaded information.

data: CSS data loaded in memory
Returns: true. The return value is deprecated and false will only be returned for backwards compatibility reasons if an @error is not null and a loading error occured. To track errors while loading CSS, connect to the GtkCssProvider::parsing-error signal.