<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>margin-right 一行右侧第一个元素有双边距</title>
<style>
.box{ float:left;border:10px solid #000;}
.box div{width:100px;height:100px;background:Red;margin-right:20px;border:5px solid #ccc; float:left;}
/*
margin-right 一行右侧第一个元素有双边距
margin-left 一行左侧第一个元素有双边距
*/
</style>
</head>
<body>
<div class="box">
<div>1</div>
<div>2</div>
<div>3</div>
<div>4</div>
</div>
</body>
</html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>margin-right 一行右侧第一个元素有双边距</title>
<style>
.box{ float:left;border:10px solid #000;}
.box div{width:100px;height:100px;background:Red;margin-right:20px;border:5px solid #ccc; float:left;}
/*
margin-right 一行右侧第一个元素有双边距
margin-left 一行左侧第一个元素有双边距
*/
</style>
</head>
<body>
<div class="box">
<div>1</div>
<div>2</div>
<div>3</div>
<div>4</div>
</div>
</body>
</html>