fx-file-server/hugo/docsy/layouts/_partials/td/render-heading.html

<h{{ .Level }}
  {{- range $key, $value := .Attributes -}}
    {{ printf " %s=%q" $key (string $value) | safeHTMLAttr -}}
  {{ end -}}
>
  {{- .Text | safeHTML -}}
  {{ partial "td/heading-self-link.html" . -}}
</h{{ .Level }}>

{{- define "_partials/td/heading-self-link.html" -}}
<a class="td-heading-self-link" href="#{{ .Anchor | safeURL }}" aria-label="Heading self-link"></a>
{{- end -}}