title: :focus pseudo class with next sibling curiosity
body: <p>I know people here tend to read the draft specifications, but unfortunately i lag in that department so i have a question.</p>
  
  <p>Is this a bug, not implemented yet, will not be implemented or not known yet?</p>
  
  <pre><code>&lt;div&gt;Hello there&lt;/div&gt;
  &lt;div&gt;I'm next&lt;/div&gt;
  
  div:hover + div { background: blue; } /*works*/
  div:focus + div { background: blue; } /*does NOT work*/
  </code></pre>
  
  <p>EDIT: this div structure choice is a bad example because it's quite hard to focus the div in an environment like the jsfiddle, but still, general question.</p>
  
  <p>EDIT2: Scratch that, it works, but you can't focus it with a mouse. Weird.</p>
  
  <p>EDIT3: You actually can, see accepted answer.</p>