lovecoding
/
web0715


			
				
					
						
						
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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">
    <title>BFC</title>
    <style>
        .box1,.box2{
            height: 100px;
            width: 100px;
            float: left;
        }
        .box1{
            background-color: red;
        }
        .box2{
            background-color: blue;
        }
        .box3{
            width: 300px;
            height: 300px;
            background-color: blue;
            overflow: hidden;
        }
        .box4{
            width: 100px;
            height: 100px;
            background-color: red;
            margin-top:50px;
        }
        .box5,.box6{
            width: 100px;
            height: 100px;
        }
        .box5{
            background-color: blue;
            margin-bottom: 50px;
        }
        .box6{
            margin-top:30px;
            background-color: red;
        }
        .box7{
            overflow: hidden;
        }
    </style>
</head>
<body>
    <a href="https://developer.mozilla.org/zh-CN/docs/Web/CSS/CSS_display/Block_formatting_context">BFC文档</a>
    <!-- BFC 块级格式化上下文 -->
     <!-- 浮动后会出现父元素高度塌陷 -->
     <!-- <div class="box">
        <div class="box1"></div>
        <div class="box2"></div>
        <div>hello</div>
     </div> -->
     <!-- 外边距益出 -->
     <!-- <div class="box3">
        <div class="box4"></div>
     </div> -->

     <!-- 外边距合并 -->
     <div class="box7">
        <div class="box5"></div>
     </div>
     <div class="box6"></div>
</body>
</html>