child selector

There is also a more useful selector sub-selector, that is, the greater than symbol (>), which is used to select the first-generation child elements of the specified label element. For example, the code in the code editor on the right:

.food>li{border:1px solid red;}

This line of code will add a red solid border to the sub-element li (fruits, vegetables) under the class name food.

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<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>子选择符</title>
<style type="text/css">
.food>li{border:1px solid red;}/*添加边框样式（粗细为1px， 颜色为红色的实线）*/

</style>
</head>
<body>
<p class="first">三年级时，<span>我还是一个<span>胆小如鼠</span>的小女孩</span>，上课从来不敢回答老师提出的问题，生怕回答错了老师会批评我。就一直没有这个勇气来回答老师提出的问题。学校举办的活动我也没勇气参加。</p>
<h1>食物</h1>
<ul class="food">
 <li>水果
 <ul>
 	<li>香蕉</li>
 <li>苹果</li>
 <li>梨</li>
 </ul>
 </li>
 <li>蔬菜
 	<ul>
 	<li>白菜</li>
 <li>油菜</li>
 <li>卷心菜</li>
 </ul>
 </li>
</ul>
</body>
</html>

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