我遇到了这个不寻常的Firefox(据我所知 - 我只针对Safari和Chrome进行了检查,并且正在使用Firefox 3.6)今天在工作中使用CSS bug,并设法用更小的代码片段重现问题,这里:
<!DOCTYPE html>
<head>
<style>
/*
* A small snippet of some CSS resets code from html5doctor and YUI fonts and resets
* added just to make sure it's not from weird browser padding/margin. Still happens
* if this is removed though
*/
html, body, div, span, p, ul, li {
margin: 0;
padding: 0;
border: 0;
outline: 0;
font-size: 100%;
background: transparent;
}
body {
line-height: 1;
}
li {
list-style: none;
}
body {
color: #333;
font-family: Helvetica, Arial, Verdana, Geneva, sans-serif;
line-height: 1.3;
}
/* Some clearfix code from HTML5 Boilerplate */
.clearfix:before, .clearfix:after {
content: "\0020";
display: block;
height: 0;
visibility: hidden;
}
.clearfix:after {
clear: both;
}
.clearfix {
zoom: 1;
}
</style>
</head>
<body>
<div style="padding: 20px; border: solid thin black;">Hello!</div>
<div>
<ul class="clearfix">
<li style="float: left; padding: 5px; border: solid thin black;">There</li>
<li style="float: left; padding: 5px; border: solid thin black;">should</li>
<li style="float: left; padding: 5px; border: solid thin black;">be no</li>
<li style="float: left; padding: 5px; border: solid thin black;">margin</li>
<li style="float: left; padding: 5px; border: solid thin black;">above</li>
<li style="float: left; padding: 5px; border: solid thin black;">this</li>
<li style="float: left; padding: 5px; border: solid thin black;">list</li>
</ul>
<p style="margin-top: 30px">Yet for some reason the 30px margin-top on this p applies to both this p as well as the above list</p>
</div>
</body>
</html>
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这是问题的截图 
那么,我通常想到会在这里发生的是,有两个之间没有余量<div>S,或者上面的<ul>,而事实上,悬停在Firebug的元素将显示无保证金/填充颜色.但由于某种原因,30px的利润率顶部<p>正在被应用于 <p>它及其包含<div>.我的猜测是有什么地方与clearfix车(事实上,如果你使用一个清算<br/>,这个问题消失了),但我很好奇,如果任何人有洞察这里究竟问题.谢谢!
小智 6
这是正确的,你没有使用正确的clearfix ;-)
这个应该解决这个问题:
.clearfix:before,
.clearfix:after {
content: ".";
display: block;
height: 0;
overflow: hidden;
}
.clearfix:after {clear: both;}
.clearfix {zoom: 1;}
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请参阅:http: //www.yuiblog.com/blog/2010/09/27/clearfix-reloaded-overflowhidden-demystified/
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