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外边距合并.html
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外边距合并.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>Document</title>
<style>
div {
width: 200px;
height: 200px;
}
#div1 {
background: red;
margin-bottom: 30px;
}
#div2 {
background: black;
margin-top: 50px;
}
#div3 {
height: 300px;
width: 300px;
background: #00ff;
margin-top: 50px;
overflow: hidden;
/* border-color:1px solid transparent; */
/* float: left; */
/* position:absolute; */
}
#div4 {
height: 200px;
width: 200px;
background:black;
margin-top: 10px;
}
/*
外边距合并
1.父元素overflow:hidden 最常用
2.父元素加边框
3.父元素浮动 float
4.父元素或者子元素定位
*/
</style>
</head>
<body>
<!-- <div id="div1">111</div>
<div id="div2">222</div> -->
<div id="div3">
<div id="div4">222</div>
</div>
</body>
</html>