title: GWT "Template with variable in CSS attribute context" Warning is bad?
body: <p>Im using obfuscated styles eg.</p>
  
  <pre><code>    &lt;ui:style&gt;
          .explanation {
              text-align: center;
          }
      &lt;/ui:style&gt;
  ...
      &lt;g:HTMLPanel&gt;
          &lt;div class="{style.explanation}"&gt;
  ...
  </code></pre>
  
  <p>Is this bad practice?</p>
  
  <p>It looks ok when I check the HTML, or perhaps I'm misunderstanding the warning..</p>
  
  <p>Im getting the following warning in Development Mode with GWT :</p>
  
  <pre><code>Template with variable in CSS attribute context: 
  The template code generator cannot guarantee HTML-safety of the template
   -- please inspect manually or use SafeStyles to specify arguments in a CSS attribute context
  </code></pre>