Load a new content into a previously created WebView window. This function must be invoked after WebView windows is
    created with create_window(). Otherwise an exception is thrown.
    :param content: Content to load.
    :param base_uri: Base URI for resolving links. Default is the directory of the application entry point.
    :param uid: uid of the target instance

def load_html(content, base_uri=base_uri(), uid='master'):
    """
    Load a new content into a previously created WebView window. This function must be invoked after WebView windows is
    created with create_window(). Otherwise an exception is thrown.
    :param content: Content to load.
    :param base_uri: Base URI for resolving links. Default is the directory of the application entry point.
    :param uid: uid of the target instance
    """
    content = make_unicode(content)
    gui.load_html(content, base_uri, uid)