Exercise:

Add a red color to the <span> element that is the descendant of <ul>.

ヒント：find() メソッドを使用します。

<!DOCTYPE html>
<html>
<head>
<style>
.ancestors * { 
    display: block;
    border: 2px solid lightgrey;
    color: lightgrey;
    padding: 5px;
    margin: 15px;
}
</style>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
<script>
$(document).ready(function(){
    $("ul").find("span").css({"color": "red"});
});
</script>
</head>
<body>

<div class="ancestors">
  <div style="width:500px;">div
    <ul>ul 
      <li>li
        <span>span</span>
      </li>
    </ul>   
  </div>
</div>

</body>
</html>