 will land you at the same vertical
        // index.
        //
        // Consider a deck with six slides ordered in two vertical stacks:
        // 1.1    2.1
        // 1.2    2.2
        // 1.3    2.3
        //
        // If you're on slide 1.3 and navigate right, you will normally move
        // from 1.3 -> 2.1. If "grid" is used, the same navigation takes you
        // from 1.3 -> 2.3.
        navigationMode: {{ navigation_mode }},
        // Randomizes the order of slides each time the presentati