edges" or "bottom-right"
        controlsLayout: {{ controls_layout }},
        // Visibility rule for backwards navigation arrows; "faded", "hidden"
        // or "visible"
        controlsBackArrows: {{ controls_back_arrows }},
        // Display a presentation progress bar
        progress: {{ progress }},
        // Display the page number of the current slide
        // - true:    Show slide number
        // - false:   Hide slide number
        //
        // Can optionally be set as a string that spec