layouts/shortcodes/epigraph.html

{{- $link := .Get "link" }}
<div role="doc-epigraph" class="epigraph">
    <blockquote>
    {{ .Inner | markdownify }}
    {{- if .IsNamedParams }}
        <footer>
        {{- with .Get "pre" }}{{ . }}{{ end }}
        {{- with .Get "cite" }}<cite>{{ if $link }}<a href="{{ $link }}">{{ . }}</a>{{ else }}{{ . }}{{ end }}</cite>{{ end }}
        {{- with .Get "post" }}{{ . }}{{ end }}
        </footer>
    {{- end }}
    <blockquote>
</div>