title: Select element based on multiple classes
body: <p>I have a style rule I want to apply to a tag when it has <strong>two</strong> classes. Is there any way to perform this without JavaScript? In other words:</p>
  <pre class="lang-html prettyprint-override"><code>&lt;li class=&quot;left ui-class-selector&quot;&gt;
  </code></pre>
  <p>I want to apply my style rule <em>only</em> if the <code>li</code> has both <code>.left</code> and <code>.ui-class-selector</code> classes applied.</p>