一些奇怪的事情,通过css伪都明确:后 [英] Some weird thing with clear both via css pseudo :after
问题描述
检查以下代码:
HTML
< h1 class =one> Sometext over here< / h1>
< input type =textplaceholder =E-mailclass =two>
CSS
.one {
display:block;
float:left;
width:450px;
height:60px;
padding-top:25px;
color:#ffffff;
font-size:34px;
font-weight:800;
}
.one:after {clear:both; }
.two {
margin:0 auto;
font-size:150%;
width:200px;
height:20px;
}
为什么将
清除时,它自己的工作方式。与<$ c $>在
元素之后的c>元素在上面的这个例子中不起作用?而在
:在
之后清除浮动技巧在浮动元素内工作于伪元素内元素父。 如果您将< div style =clear:both>< / div>
> h1 中它不会清除浮点数,所以它必须是浮动元素的兄弟元素或父元素。
所以在你的情况下,只需清除输入
中的浮动数据
.one {float:left; width:450px;身高:60px; padding-top:25px;颜色:#ccc;字体大小:34像素; font-weight:800;}。{display:block;保证金:0汽车; font-size:150%;宽度:200px; height:20px; clear:both;}
< h1 class =one > Sometext over here< / h1>< input type =textplaceholder =E-mailclass =two>
Examine this code:
HTML
<h1 class="one">Sometext over here</h1>
<input type="text" placeholder="E-mail" class="two">
CSS
.one {
display: block;
float: left;
width: 450px;
height: 60px;
padding-top: 25px;
color: #ffffff;
font-size:34px;
font-weight: 800;
}
.one:after { clear: both; }
.two {
margin: 0 auto;
font-size: 150%;
width: 200px;
height: 20px;
}
Why is the clear both
with the after
element not working in this example above? while the clearing with <div style="clear:both"></div>
inside the layout it self do work.
The :after
clear float trick works on floated element inside the pseudo elements parent.
If you would put the <div style="clear:both"></div>
inside the h1
it will not clear the float either, so it has to be a sibling or a parent element of the floated element
So in your case just clear the float on the input
.one {
float: left;
width: 450px;
height: 60px;
padding-top: 25px;
color: #ccc;
font-size:34px;
font-weight: 800;
}
.two {
display: block;
margin: 0 auto;
font-size: 150%;
width: 200px;
height: 20px;
clear: both;
}
<h1 class="one">Sometext over here</h1>
<input type="text" placeholder="E-mail" class="two">
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