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@@ -0,0 +1,68 @@
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+<!DOCTYPE html>
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+<html lang="en">
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+<head>
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+ <meta charset="UTF-8">
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+ <meta name="viewport" content="width=device-width, initial-scale=1.0">
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+ <title>BFC</title>
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+ <style>
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+ .box1,.box2{
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+ height: 100px;
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+ width: 100px;
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+ float: left;
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+ }
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+ .box1{
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+ background-color: red;
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+ }
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+ .box2{
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+ background-color: blue;
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+ }
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+ .box3{
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+ width: 300px;
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+ height: 300px;
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+ background-color: blue;
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+ overflow: hidden;
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+ }
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+ .box4{
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+ width: 100px;
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+ height: 100px;
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+ background-color: red;
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+ margin-top:50px;
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+ }
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+ .box5,.box6{
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+ width: 100px;
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+ height: 100px;
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+ }
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+ .box5{
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+ background-color: blue;
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+ margin-bottom: 50px;
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+ }
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+ .box6{
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+ margin-top:30px;
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+ background-color: red;
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+ }
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+ .box7{
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+ overflow: hidden;
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+ }
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+ </style>
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+</head>
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+<body>
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+ <a href="https://developer.mozilla.org/zh-CN/docs/Web/CSS/CSS_display/Block_formatting_context">BFC文档</a>
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+ <!-- BFC 块级格式化上下文 -->
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+ <!-- 浮动后会出现父元素高度塌陷 -->
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+ <!-- <div class="box">
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+ <div class="box1"></div>
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+ <div class="box2"></div>
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+ <div>hello</div>
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+ </div> -->
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+ <!-- 外边距益出 -->
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+ <!-- <div class="box3">
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+ <div class="box4"></div>
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+ </div> -->
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+
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+ <!-- 外边距合并 -->
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+ <div class="box7">
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+ <div class="box5"></div>
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+ </div>
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+ <div class="box6"></div>
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+</body>
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+</html>
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