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bfc.html
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<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport"
content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>bfc</title>
<style>
.container {
width: 400px;
height: 400px;
}
.float {
float: left;
width: 100px;
height: 100px;
background-color: #ffa500;
}
.main {
height: 400px;
background-color: #00bfff;
}
/**
* 触发bfc的条件:
* float属性不为none
* position为absolute或fixed
* display为inline-block, table-cell, table-caption, flex, inline-flex
* overflow不为visible
*/
.bfc {
overflow: hidden;
}
</style>
<script>
/**
* bfc的核心
* 1.页面中的一块渲染区域，并且有一套渲染规则
* 2.BFC就是页面上的一个隔离的独立容器，容器里面的子元素不会影响到外面的元素。反之也如此。
* 3.BFC的区域不会与float box重叠
*/
</script>
</head>
<body>
<!-- main没有生成新的bfc,会产生重叠 -->
<div class="container">
<div class="float"></div>
<div class="main"></div>
</div>
<!-- main通过设置overflow触发了bfc,不重叠了 -->
<div class="container">
<div class="float"></div>
<div class="main bfc"></div>
</div>
</body>
</html>