1  {% if site.gtm %}
 2    <!-- Google Tag Manager -->
 3    <script>
 4      (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':
 5        new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],
 6        j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src=
 7        'https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);
 8      })(window,document,'script','dataLayer','{{ site.gtm }}');
 9    </script>
10    <!-- End Google Tag Manager -->
11  {% endif %}