Tryit Editor v2.9

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<!DOCTYPE html>
<html>
<head>
<style>
div {background-color: green;}
div a {
    text-decoration: none;
    color: white;
    font-size: 20px;
    padding: 15px;
    display:inline-block;
}
ul {
  display: inline;
  margin: 0;
  padding: 0;
}
ul li {display: inline-block;}
ul li:hover {background: #555;}
ul li:hover ul {display: block;}
ul li ul {
  position: absolute;
  width: 200px;
  display: none;
}
ul li ul li { 
  background: #555; 
  display: block; 
}
ul li ul li a {display:block !important;} 
ul li ul li:hover {background: #666;}
</style>
</head>
<body>

<div>
  <a href="tryit.asp-filename=trycss_sel_hover_dropdown.html#">Useless Link</a>
  <ul>
    <li>
      <a href="tryit.asp-filename=trycss_sel_hover_dropdown.html#">Dropdown Link</a>
      <ul>
        <li><a href="tryit.asp-filename=trycss_sel_hover_dropdown.html#">Link 1</a></li>
        <li><a href="tryit.asp-filename=trycss_sel_hover_dropdown.html#">Link 2</a></li>
        <li><a href="tryit.asp-filename=trycss_sel_hover_dropdown.html#">Link 3</a></li>
      </ul>
    </li>
  </ul>
</div>

</body>
</html>