纯CSS实现导航栏下划线跟随的示例代码
本篇文章主要介绍了纯CSS实现导航栏下划线跟随的示例代码，分享给大家，具体如下：
效果：
代码：
html：
<ul>
<li>aaaa</li>
<li>bbbbbbb</li>
<li>cccc</li>
<li>dddd</li>
<li>eeee</li>
</ul>
css：
ul {
padding:0;
margin:0;
font-size:0;
}
li {
font-size:20px;
padding:5px 15px 5px 15px;
display: inline-block;
position:relative;
cursor: pointer;
transition: all 0.5s;
}
li::before {
content:'';
display:block;
position:absolute;
width:0%;
bottom:0;
left:100%;
border-bottom: 2px solid #999;
transition: all 0.5s;
}
li:hover::before {
left:0;
width:100%;
}
li:hover ~ li::before {
left:0;
}
关键部分：
li:hover::before {
left:0;
width:100%;
}
li:hover ~ li::before {
left:0;
}
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