// individually
        previewLinks: {{ preview_links }},
        // Exposes the reveal.js API through window.postMessage
        postMessage: {{ post_message }},
        // Dispatches all reveal.js events to the parent window through postMessage
        postMessageEvents: {{ post_message_events }},
        // Focuses body when page changes visibility to ensure keyboard shortcuts work
        focusBodyOnPageVisibilityChange: {{ focus_body_on_page_visibility_change }},
        // Transition style
        tr