清楚：两者都不会工作 [英] clear:both won't work

问题描述

以下是标题中的菜单。 ul和li元素是浮动的，现在浮动在标题下，我试图防止与清除：两者。

Below is a menu inside a header. The ul and li elements are floating and are now floating underneath the header, which I've tried to prevent with clear:both. However, that doesn't seem to work so I wonder... what can be wrong?

html：
$ b

html:

<header>
    <ul>
        <li><a href='#'>Item 1</a></li>
        <li><a href='#'>Item 2</a></li>
        <li><a href='#'>Item 3</a></li>
        <li><a href='#'>Item 4</a></li>
    </ul>
    <div class='clear'/>
</header>

css：

header {
    background: #888;
    height: 20px;
    padding: 10px;
}

ul{
  margin: 18px 0;
  padding: 0;
  list-style: none;
}

ul li{
  margin: 0 10px 0 0;
  padding: 0;
  display: block;
  float: left;
  width: 80px;
  height: 20px;
  border: 1px solid #000;
  background: red;
}

ul li a{
  display:block;
  width: 100%;
  height: 100%;
  text-decoration: none;
  float: left;
  text-align: center;
  padding-top: 2px;
}

ul li a:hover{
  color: #fff;
  background-color: #000;
}​

.clear {
    clear:both;
}

推荐答案

.clearfix:after {
  clear:both;
  content:".";
  display:block;
  height:0;
  line-height:0;
  visibility:hidden;
}

并将其应用于ul和标题。

and apply that to both the ul and the header.

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