hugo-book-theme/layouts/shortcodes/tabs.html

{{ if .Inner }}{{ end }}
{{ $id := .Get 0 }}
{{ $group := printf "tabs-%s" $id }}

<!-- 
<div class="book-tabs">
  <div class="book-tabs-head">
  {{ range $index, $tab :=  .Scratch.Get $group }}
    <label for="{{ printf "%s-%d" $group $index }}">
      {{ $tab.Name }}
    </label>
  {{ end }}
  </div>
  {{ range $index, $tab := .Scratch.Get $group }}
  <input type="radio" name="{{ $group }}" style="display: none;" id="{{ printf "%s-%d" $group $index }}" {{ if not $index }}checked="checked"{{ end }} />
  <div class="book-tabs-content book-tabs-{{ $index }} markdown-inner">
    {{ .Content | markdownify }}
  </div>
  {{ end }}
</div>
-->

<div class="book-tabs">
{{ range $index, $tab :=  .Scratch.Get $group }}
  <input type="radio" name="{{ $group }}" style="display: none;" id="{{ printf "%s-%d" $group $index }}" {{ if not $index }}checked="checked"{{ end }} />
  <label for="{{ printf "%s-%d" $group $index }}">
    {{ $tab.Name }}
  </label>
  <div class="book-tabs-content markdown-inner">
    {{ .Content | markdownify }}
  </div>
{{ end }}
</div>