{{- $contents := .TableOfContents -}}
{{- if and .IsPage (eq .Section "writing") .Params.abstract -}}
	{{- if strings.Contains $contents "<ul>" -}}
		{{- $contents = replace $contents "<ul>" `<ul><li><a href="#abstract">Abstract</a></li>` 1 -}}
	{{- else -}}
		{{- $contents = `<nav id="TableOfContents"><ul><li><a href="#abstract">Abstract</a></li></ul></nav>` -}}
	{{- end -}}
{{- end -}}
{{- $label := cond .IsHome "On this page" "Contents" -}}
{{- return ($contents | replaceRE `<nav id="TableOfContents">` (printf `<nav id="TableOfContents" aria-label="%s">` $label) | safeHTML) -}}