hugo-theme-hilfe/layouts/shortcodes/katex.html

{{ if not (.Page.Scratch.Get "katex") }}
  <!-- Include katext only first time -->
  <link
    rel="stylesheet"
    href="{{ index (index .Site.Data.assets "katex.css") "src" | relURL }}"
  /><script defer src="{{ index (index .Site.Data.assets "katex.js") "src" | relURL }}"></script>
  {{ .Page.Scratch.Set "katex" true }}
{{ end }}


<span class="gdoc-katex katex{{ with .Get "class" }}{{ . }}{{ end }}">
  {{ cond (in .Params "display") "\\[" "\\(" -}}
  {{- trim .Inner "\n" -}}
  {{- cond (in .Params "display") "\\]" "\\)" }}
</span>