anchor.diff:  <div class="navigation">
     <ul>
       <li><a href="#forest_clearing">Forest Clearing</a></li>
  -    <li><a href="#permits">Permits</a>  </li>
  +    <li><a href="#forest_use">Forest use</a>  </li>
       <li><a href="#forest_cover">Forest cover</a> </li>
       <li><a href="#conservation">Conservation</a> </li>
     </ul>
  
positive.code: 
    <ul class="sources">
      <li id="semi_monthly" data-slug="semi_monthly">
      <strong>Pan-tropical monthly alerts</strong>
      <p>Forest Monitoring for Action (FORMA) is a system for identifying near real-time forest change across the tropics, developed by researchers Dan Hammer, Robin Kraft, and David Wheeler. FORMA uses imagery from the MODIS Terra satellite to assess forest disturbance through time series analysis of vegetation intensity (NDVI) and other factors at 500m resolution. FORMA forest clearing alerts are produced every 16-days, and are compiled on the GFW 2.0 platform as monthly alerts. FORMA is a project of World Resources Institute and was developed at the Center for Global Development.</p>
      <p class="credits">Credit: Dan Hammer, Robin Kraft, and David Wheeler; World Resouces Institute; Center for Global Development (2013)</p>
      </li>    
      <li id="brazilian_amazon" data-slug="brazilian_amazon">
      <strong>Brazilian Amazon monthly alerts</strong> 
      <p>The Deforestation Alert System (SAD), produced by Imazon in Brazil, provides monthly reports on deforestation and forest degradation in the Brazilian Amazon. Monthly reports and maps are available for download from Imazon’s website.</p>
      <p class="credits">Credit: Imazon</p>    
      </li>
      <li id="annual" data-slug="querterly">
      <strong>Global annual area</strong>
  
negative.code: 
    <article id="permits">
  
    <h1 class="forest_use"><a href="#" name="forest_use"></a>Forest Use</h1>
  
    <ul class="sources">
      <li id="cameroon_logging" data-slug="logging" class="flag cm">
  