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demo10.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>BFC作用</title>
<style>
body{
max-width: 1000px;
margin: 0 auto;
text-align: center;
}
div{
margin: 0 auto;
}
h1{
color: rgb(0, 0, 0);
}
h2{
color: rgb(56, 56, 56);
}
.box{
width: 100px;
background: pink;
}
.item{
width: 50px;
background: red;
}
.box2 .item{
float: left;
}
.box3{
overflow: auto;
}
.box3 .item{
float: left;
}
.container{
width: 100px;
height: 100px;
background: #666;
}
.container div{
width: 30px;
height: 30px;
background: rgb(56, 177, 92);
border: 1px solid;
}
.container3 div,
.container2 div{
margin: 30px;
}
.container3{
overflow: auto;
}
</style>
</head>
<body>
<h1>解决浮动问题</h1>
<h2>这是初始的</h2>
<p>父元素是粉色,里面只有一个红色块级元素,加了宽度,内容由字体撑开</p>
<div class="box">
<div class="item">lio</div>
</div>
<h2>这红块是设置了浮动的</h2>
<p>粉色不见了,因为浮动的原因造成父元素高度坍塌</p>
<div class="box box2">
<div class="item">lio</div>
</div>
<br>
<h2>这红块是设置了浮动,父元素加overflow:auto的</h2>
<p>形成BFC,计算BFC的高度时,浮动元素也参与计算。</p>
<div class="box box3">
<div class="item">lio</div>
</div>
<h1>解决父子margin合并问题</h1>
<p>两个没有margin的小绿块和父元素</p>
<div class="container">
<div></div>
<div></div>
</div>
<p>两个设置margin为30的小绿块,父元素和小绿块的margin重叠了,两个小绿块的某些外边距也重叠了</p>
<div class="container container2">
<div></div>
<div></div>
</div>
<p>给父元素设置overflow:auto产生BFC后,父元素有了纵轴滚动条,这是因为小绿块的上下margin值撑开了内部高度的原因,但两个相邻的小绿块重叠的部分还是重叠,这是因为特性里:Box垂直方向的距离由margin决定。属于同一个BFC的两个相邻Box的margin会发生重叠</p>
<div class="container container3">
<div></div>
<div></div>
</div>
</body>
</html>