<% if (numberOfVisitors != null) { %>
<p>
  <div class="stat">
    <div class="impact-number"><strong>&nbsp;</strong></div>
    <span class="stat-description"></span>
  </div>

  <div class="sparkline">
    <span class="sparkline-title"></span>
    <div class="sparkline-graph"></div>
  </div>

</p>
<% } %>

<% if (numberOfVisitors != null) { %>
<p>
  <div class="stat">
    <div class="impact-number"><strong>&nbsp;</strong></div>
    <span class="stat-description" role="presentation"></span>
  </div>

  <div class="sparkline">
    <span class="sparkline-title"></span>
    <div class="sparkline-graph"></div>
  </div>

</p>
<% } %>

Hide 'Users over past 24 hours' in realtime
Hide 'Users over past 24 hours' in realtime

role="presentation" should hide the text to most screenreaders. We want
to hide this text as it is describing the graph and is therefore
irrelevant to sight impared users.
