{{- if .Site.IsServer -}}
<!-- only production, not generate Tag Manager with Hugo’s built-in server -->
{{- else -}}
{{- with .Site.Params.tag_manager_container_id -}}
<!-- BEGIN: Tag Manager -->
<script>(function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':
new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],
j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src=
'https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);
})(window,document,'script','dataLayer','{{ . }}');</script>
<!-- END: Tag Manager -->
{{- end -}}
{{- end -}}