hugo-theme-relearn/layouts/partials/shortcodes/expand.html

{{- $page := .page }}
{{- if and (not $page) .context }}
  {{- $page = .context }}
  {{- warnf "%q: DEPRECATED parameter 'context' for shortcode 'expand' found, use 'page' instead; see https://mcshelby.github.io/hugo-theme-relearn/basics/migration#5180" $page.File.Filename }}
{{- end }}
{{- $content := .content }}
{{- $title := .title | default (T "Expand-title") }}
{{- $title = trim $title " " }}
{{- $expanded := .expanded | default false }}
{{- if and (isset . "open") (or (ne (printf "%T" .open) "string") (ne (trim .open " " ) "")) }}
  {{- warnf "%q: DEPRECATED parameter 'open' for shortcode 'expand' found, use 'expanded' instead; see https://mcshelby.github.io/hugo-theme-relearn/basics/migration#630" $page.File.Filename }}
  {{- $expanded = .open }}
{{- end }}
{{- if eq (printf "%T" $expanded) "string" }}
	{{- $expanded = (eq $expanded "true") }}
{{- end }}
{{- $id := cond (or (eq .id nil) (eq .id "")) (partial "make-random-md5.hugo" $page) .id }}
{{- with $page }}
<div class="expand">
  <input type="checkbox" id="R-expand-{{ $id }}" aria-controls="R-expandcontent-{{ $id }}" {{ if $expanded }} checked{{ end }}>
  <label class="expand-label" for="R-expand-{{ $id }}">
    <i class="expander-icon fa-fw fas fa-chevron-down"></i>
    <i class="expander-icon fa-fw fas fa-chevron-right"></i> {{ $title | .RenderString }}
  </label>
  <div id="R-expandcontent-{{ $id }}" class="expand-content">
{{ if ne "<" (substr (strings.TrimLeft "\n\r\t " $content) 0 1) }}<p>{{ end }}<!-- we add a DOM element here if there is none to make collapsing marings work -->
{{ $content | safeHTML }}</div><!-- no line break allowed here because of awkward behavior of Hugo 110 or this theme when tag shortcode is called standalone outside of tags shortcode ? -->
</div>
{{- end }}