layouts/_default/_markup/render-heading.html (5 lines of code) (raw):

<h{{ .Level }}{{- range $k, $v := .Attributes -}}{{- printf " %s=%q" $k $v | safeHTMLAttr -}}{{- end }}>{{- .Text | safeHTML -}} {{- if and (ge .Level 1) (le .Level 4) }}{{" " -}} <a class="headerlink" title="Permalink" href="#{{ .Anchor | safeURL }}">&para;</a> {{- end -}} </h{{ .Level }}>