{{ define "nav" }}
    <ul>
        {{ if gt .num 0 }}
            <li><a href="/{{.prev}}.html">Previous</a></li>
        {{ end }}
        <li><a href="/{{.next}}.html">Next</a></li>
    </ul>
    {{/* Piggy-back title updates on the NAV swap to avoid extra requests */}}
    <h1 id="title" hx-swap-oob="true">Demo {{ .curr }}</h1>
    <title id="page title" hx-swap-oob="true">Demo {{ .curr }}</title>
{{ end }}