title: Focus not highlighting anchor link on tab
body: <p>All anchor links except for one are getting background color changed on focus, except for one. </p>
  
  <p>HTML</p>
  
  <p><code>&lt;a id="login-as-guest"&gt;Cancel and browse as guest&lt;/a&gt;</code></p>
  
  <p>CSS</p>
  
  <p><code>#login-as-guest a:focus{
      background-color: yellow;
  }</code></p>
  
  <p>Any ideas?</p>