title: CSS selector with hyphen/dash
body: <p>In the code below I want to select all the elements having a class name that start with "bg-client"</p>
  
  <pre><code>&lt;span class="bg-client"&gt;Lorem ipsum&lt;/span&gt;
  &lt;span class="bg-client_a"&gt;Lorem ipsum&lt;/span&gt;
  &lt;span class="bg-client_b"&gt;Lorem ipsum&lt;/span&gt;
  &lt;span class="bg-client_c"&gt;Lorem ipsum&lt;/span&gt;
  </code></pre>
  
  <p>I tried this but it doesn't work</p>
  
  <pre><code>[class^="bg-client"] {}
  [class^="bg\2Dclient"] {}
  [class^="bg\u002Dclient"] {}
  </code></pre>
  
  <p>Any help ?</p>