<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>菜鸟教程(runoob.com)</title>
<style type="text/css">
.block {
width: 200px
height：200px
padding: 30px
background-color: red
border-style:solid
border-width:10px
border-color:green
//border:10px solid yellow
//border-radius: 20px
//margin:auto
}
</style>
</head>
<body>
<div class="block">border</div>
</body>
</html>
--兄弟元素margin合并
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style type="text/css">
body {
background: pink
}
.div {
//overflow: hidden
//margin: 0 auto
width: 300px
height: 600px
background: #aaa
}
.div1 {
width: 200px
height: 200px
background: red
//margin: 50px 0px
//float: left
}
.div2 {
width: 200px
background: green
//margin: 50px 0px
height: 200px
//float: left
}
</style>
</head>
<body>
<div class="div">
<div class="div1"></div>
<div class="div2"></div>
</div>
</body>
</html>
----父子元素margin合并
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>菜鸟教程(runoob.com)</title>
<style type="text/css">
body {
background: pink
}
.div1 {
//margin-top: 20px
width: 450px
height: 450px
background: #aaa
//overflow:hidden
//border:1px solid red
}
.div2 {
width: 200px
height: 200px
background: red
//margin-top: 50px
}
</style>
</head>
<body>
<div class="div1">
<div class="div2"></div>
</div>
</body>
</html>
--box-sizing
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>菜鸟教程(runoob.com)</title>
<style type="text/css">
.group {
/* background-color: blue*/
overflow: hidden
}
.block {
width: 33.33%
padding: 20px
float: left
//box-sizing: border-box
}
.red {
background-color: red
//box-sizing: conten-box
//overflow: hidden
//outline:#00FF00 dotted thick
}
.green {
background-color: green
}
.gray {
background-color: gray
//box-sizing: border-box
}
</style>
</head>
<body>
<div class="group">
<div class="block red">1</div>
<div class="block green">2</div>
<div class="block gray">3</div>
</div>
</body>
</html>
--盒子显示（display）类型
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>菜鸟教程(runoob.com)</title>
<style>
.background{
background-color:#F60
margin-bottom:5px
margin-left:5px
height:50Px
}
.display1{
display:block
}
.display2{
display:inline
//display:inline-block
}
</style>
<div class="background ">Div默认为 block</div>
<div class="background ">Div默认为 block</div>
<div class="background ">Div默认为 block</div>
<div class="background display2">修改为 inline</div>
<div class="background display2">修改为 inline</div>
<div class="background display2">修改为 inline</div>
<span class="background display1">加了block属性</span>
<span class="background display1">加了block属性</span>
<span class="background display1">加了block属性</span>
<span class="background">没加block属性</span>
<span class="background">没加block属性</span>
<span class="background">没加block属性</span>
</body>
</html>
<style type="text/css">#testDIV{
width: 80px
height: 80px
background-color: yellow
border:5px solid red
padding:5px 10px 5px 10px
}
</style>
</head>
<body>
<div id="testDIV">sdf</div>
解决办法，CSS代码修改如下：
#col2{background:#F63
box-flex:1
-webkit-box-flex:1
-moz-box-flex:1
width: 0% /* 加上这行代码 */
}
#col3{
background:#690
box-flex:3
-webkit-box-flex:3
-moz-box-flex:3
width: 0% /* 加上这行代码 */
}
所有需要按照比例分解的列，都加上 width: 0%已经有固定值的列不需要加，原理不懂。
反正这个应该是CSS3新属性 box-orient 没有完善的原因。
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