anchor.diff:  doctype html
   html(lang="en")
  -  
  +
     head
  +    // Google 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','GTM-5QT6X8W');
  +    // End Google Tag Manager
       title= current_page[3]
       meta(charset="utf-8")
       meta(http-equiv="X-UA-Compatible", content="IE=edge")
  
positive.code:     if (node_env == "production")
        script(type='text/javascript').
          !function(){var analytics=window.analytics=window.analytics||[];if(!analytics.initialize)if(analytics.invoked)window.console&&console.error&&console.error("Segment snippet included twice.");else{analytics.invoked=!0;analytics.methods=["trackSubmit","trackClick","trackLink","trackForm","pageview","identify","reset","group","track","ready","alias","page","once","off","on"];analytics.factory=function(t){return function(){var e=Array.prototype.slice.call(arguments);e.unshift(t);analytics.push(e);return analytics}};for(var t=0;t<analytics.methods.length;t++){var e=analytics.methods[t];analytics[e]=analytics.factory(e)}analytics.load=function(t){var e=document.createElement("script");e.type="text/javascript";e.async=!0;e.src=("https:"===document.location.protocol?"https://":"http://")+"cdn.segment.com/analytics.js/v1/"+t+"/analytics.min.js";var n=document.getElementsByTagName("script")[0];n.parentNode.insertBefore(e,n)};analytics.SNIPPET_VERSION="3.1.0";analytics.load("#{segment_write_key}");analytics.page()}}();
      div#fb-root
negative.code: 
        meta(property="og:title", content="Rainforest Connection (RFCx): Phones Turned into Forest Guardians")
        meta(property="og:description", content="Rainforest Connection — Technology that stops illegal loggers in-the-act. Our answer to climate change & global mass extinctions.")
  
        meta(property="og:url", content="#{(http_headers['x-forwarded-proto']==='https') ? 'https' : 'http'}://#{http_headers['host']}/")
        meta(property="og:image", content="https://rfcx.org/cdn/img/intro/open-graph-v01.640.jpg")
  
        meta(property="og:video", content="https://static.rfcx.org/video/jwplayer/5.7/jwplayer.flash.swf?file=..%2f..%2fvid03%2fv5%2fvid03-v5.720.mp4&autostart=true")
        meta(property="og:video:type", content="application/x-shockwave-flash")
        meta(property="og:video:width", content="486")
  