anchor.diff:  
     <div class="block historical-articles">
       <div class="inner-block">
  -      <div class="keyline"></div>
  +      <hr class="keyline">
         <div class="content">
           <h2 id="historical-research">Historical research</h2>
           <p>History is changing all the time as new evidence and new perspectives emerge. Historians can help us make sense of this shifting landscape &ndash; through articles, seminars and exhibitions. You can find out more by exploring these series:</p>
  
positive.code: 
    <div class="block government-history">
      <div class="inner-block">
        <div class="keyline"></div>
        <div class="content">
          <h2>More sources</h2>
          <p>Many institutions, as well as universities, museums and libraries, hold information about the history of the UK government. The following websites may be useful for further research:</p>
  
negative.code: 
    <div class="block">
      <div class="inner-block floated-children">
        <hr class="keyline">
        <div class="column">
          <div class="content">
            <%= image_tag 'history/historical-documents.jpg', alt: 'Historical documents' %>
  