anchor.diff:  
   block content
   
  +	script(type="text/javascript", src="/socket.io/socket.io.js")
   	script(type="text/javascript", src="/ace/ace.js")
   	script(type="text/javascript", src="/javascripts/study.js")
   
  
positive.code: 
  	h3 2. Headers
  	p The headers are awesome
  	div#header-code
  		&lt;h1>This is a header 1&lt;/h1>
  		&lt;h2>This is a header 2&lt;/h2>
  		&lt;h3>This is a header 3&lt;/h3>
  
  	h3 3. Paragraphs
  	p Paragraphs contain cool text
  	div#paragraph-code
  		&lt;p>My paragraph text&lt;/p>
  
  	h3 4. Links
  	p Links are interesting
  	div#link-code
  		&lt;a href="http://www.website.com">My website&lt;/a>
negative.code: 	input(type="button", value="Coding" onclick="window.location.href='/coding'")
  	input(type="button", value="Sumorobot" onclick="window.location.href='/sumorobot'")
  
  	h3 Online users:
  	div#online-users
  		p Loading users ...
  	div.clear
  
  	h3 Code collaboration
  	div#code
  
  	h3 1. Basic html structure
  	p The basic html structure consists of several things
  	div#basic-example
  		&lt;html>
  		|	&lt;head>
  		|		&lt;title>Title&lt;/title>
  