{{- $this := $.Page -}}
{{- $pages := where .Site.RegularPages "Params.pageid" "eq" (.Get "pid") -}}
{{- $frag := .Get "id" -}}
{{- $fragsep := "" -}}
{{- if ne $frag "" -}}{{- $fragsep = "#" -}}{{- end -}}
{{- $inner := .Inner -}}
{{- range $pages -}}
  {{- $url := printf "%s%s%s" .Permalink $fragsep $frag -}}
  <a id="{{ .Params.pageid }}"
     anchor="{{ .Params.pageid }}"
     href="{{ $url }}">{{ or $inner .Title | markdownify }}</a>
  {{- $backlink := printf "%s#%s" $this.Permalink .Params.pageid -}}
  {{- .Scratch.Add "backlinks" (slice $this) -}}
{{- end -}}