selfprivacy.org/_vendor/github.com/google/docsy/layouts/_default/_markup/render-codeblock-chem.html

{{ .Page.Store.Set "hasmhchem" true -}}

{{/* set default delimiters */ -}}
{{ $delimiter_left := "$$" -}}
{{ $delimiter_right := "$$" -}}

{{/* override delimiters if set in config file */ -}}
{{ with $.Page.Site.Params.katex.options.delimiters -}}
  {{ range first 1 ( where . "display" true ) -}}
    {{ $delimiter_left = index . "left" -}}
    {{ $delimiter_right = index . "right" -}}
  {{ end -}}
{{ end -}}

{{/* output of chemical formulae */}}
<div class="chem">{{ $delimiter_left -}}
{{ .Inner | safeHTML -}}
{{ $delimiter_right -}}</div>{{ "" -}}