title: how to set Arial Black font family in LESS
body: <p>I use less-1.7.0.min.js. When I set Arial Black, </p>
  
  <pre><code>@fontFamily: Arial Black,Arial Black,Gadget,sans-serif;
  </code></pre>
  
  <p>After a CSS is generated, I got this :</p>
  
  <pre><code>p, span {
  font-size: 14px;
  font-family: Arial #000000, Arial #000000, Gadget, sans-serif;
  }
  </code></pre>
  
  <p>How to escape converting the color name ("Black") into color code (#000000)?</p>