<pe:keynote slideNumber="c/t" width="480" height="350" style="width: 50vw; height: 50vh;">
    <pe:keynoteItem>
        <h2>Slide 1</h2>
        <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit.</p>
    </pe:keynoteItem>
    <pe:keynoteItem>
        <pe:keynoteItem>
            <h2>Vertical Slide 1</h2>
        </pe:keynoteItem>
        <pe:keynoteItem>
            <h2>Vertical Slide 2</h2>
        </pe:keynoteItem>
    </pe:keynoteItem>
    <pe:keynoteItem visibility="uncounted">
        <h2>Slide 3</h2>
    </pe:keynoteItem>
    <pe:keynoteItem visibility="hidden">
        <h2>Slide 4</h2>
    </pe:keynoteItem>
    <pe:keynoteItem>
        <h2>Slide 5</h2>
    </pe:keynoteItem>
</pe:keynote>