title: Angular - ng-class working on td but not on tr
body: <p>The following HTML is used inside a ng-repeat.</p>
  
  <p>This works: </p>
  
  <pre><code>&lt;tr&gt;
      &lt;td ng-class="info.lastInMonth"&gt;{{ info.date_formatted }}&lt;/td&gt;
      ...
  </code></pre>
  
  <p>But this doesn't work: </p>
  
  <pre><code>&lt;tr ng-class="info.lastInMonth"&gt;
      &lt;td&gt;{{ info.date_formatted }}&lt;/td&gt;
      ...
  </code></pre>
  
  <p>The exact same expression works in the td but not on the tr. </p>
  
  <p>Anybody got an idea why?</p>