{{- if not .Ordinal -}}{{- /* first tab sets group ID */ -}}
  {{- .Parent.Store.Set "id" (partial "docs/text/shortcode-id" .Parent) -}}
{{- end -}}
{{- $group := printf "tabs-%d" (.Parent.Store.Get "id") -}}
{{- $tab := printf "%s-%d" $group .Ordinal -}}
<input type="radio" class="toggle" name="{{ $group }}" id="{{ $tab }}" {{ if not .Ordinal }}checked="checked"{{ end }} />
{{- /* remove whitespaces */ -}}
<label for="{{ $tab }}">
  {{- .Get 0 -}}
</label>
{{- /* remove whitespaces */ -}}
<div class="book-tabs-content markdown-inner">
{{ .Inner -}}
</div>
{{- /* remove whitespaces */ -}}