> to convey that it's an error message, with additional <code>.sr-only</code> text to convey this hint to users of assistive technologies.</p>
  <div class="bs-example">
    <div class="alert alert-danger" role="alert">
      <span class="glyphicon glyphicon-exclamation-sign" aria-hidden="true"></span>
      <span class="sr-only">Error:</span>
      Enter a valid email address
    </div>
  </div>
{% highlight html %}
<div class="alert alert-danger" role="alert">
  <span class="glyphicon glyphicon-exclamatio