anchor.diff:                  )
               div.col-xs-6.col-sm-3
                   iframe.twitter-follow-button(
  -                    src="http://platform.twitter.com/widgets/follow_button.1375828408.html#_=1376940868174&id=twitter-widget-2&lang=en&screen_name=jdorfman&show_count=false&show_screen_name=true&size=m",
  +                    src="//platform.twitter.com/widgets/follow_button.1375828408.html#_=1376940868174&id=twitter-widget-2&lang=en&screen_name=jdorfman&show_count=false&show_screen_name=true&size=m",
                       width="130",
                       height="20",
                       title="Twitter Tweet Button",
  
positive.code:                 )
              div.col-xs-6.col-sm-3
                  iframe.twitter-share-button.twitter-count-horizontal(
                      src="https://platform.twitter.com/widgets/tweet_button.1379006964.html#_=1379111570224&count=horizontal&hashtags=webperf&id=twitter-widget-0&lang=en&related=mervinej&size=m&text=%23BootstrapCDN%3A%20%40twBootstrap%20hosted%20by%20%40MaxCDN&url=http%3A%2F%2Fwww.bootstrapcdn.com&via=jdorfman",
                      title="Twitter Tweet Button",
                      data-twttr-rendered="true",
                      width="107",
  
negative.code:                 )
              div.col-xs-6.col-sm-3
                  iframe.twitter-follow-button(
                      src="//platform.twitter.com/widgets/follow_button.1375828408.html#_=1376940868174&id=twitter-widget-2&lang=en&screen_name=mervinej&show_count=false&show_screen_name=true&size=m",
                      width="130",
                      height="20",
                      title="Twitter Tweet Button",
  