title: how to set 2 classes to a <span>
body: <p>Is there a way I can set 2 classes for the same span?</p>
  
  <p>certain text in my HTML should have 2 classes </p>
  
  <p>for the sake of simplicity I will make it just background-colour and font color</p>
  
  <p>class FontRed that has color:Red;
  class FontYellow that has color:Yellow;
  class FontGreen that has color:Green;
  class FontBlue that has color:Blue;</p>
  
  <p>class BackRed that has background-color:Red;
  class BackYellow that has background-color:Yellow;
  class BackGreen that has background-color:Green;
  class BackBlue that has background-color:Blue;</p>
  
  <p>is there a way I can choose 2 class for the same </p>
  
  <p>something like this</p>
  
  <pre><code>&lt;span class="FontBlue;BackYellow;"&gt;Blue and Yellow back&lt;/span&gt;
  &lt;span class="FontRed;BackGreen;"&gt;Red and Green back&lt;/span&gt;
  </code></pre>