title: Remove icon from collapsible set in jQuery Mobile
body: <p>I've been trying to remove the icon from a collapsible set by setting the attribute <code>data-iconpos="none"</code> in the <code>div</code> that acts as the <code>collapsible-set</code>, but no luck. It would remove it but still leave some kind of shadow.</p>
  
  <p><img src="https://i.stack.imgur.com/2u4c2.png" alt="enter image description here"></p>