column-break-before

版本：CSS3
媒体：分页

语法：

column-break-before：auto | always | avoid | left | right | page | column | avoid-page | avoid-column

默认值：auto

适用于：块级元素

继承性：无

动画性：否

计算值：指定值

取值：

auto：: 既不强迫也不禁止在元素之前断行并产生新列
always：: 总是在元素之前断行并产生新列
avoid：: 避免在元素之前断行并产生新列

说明：

设置或检索对象之前是否断行。

对应的脚本特性为columnBreakBefore。

兼容性：

浅绿 = 支持
红色 = 不支持
粉色 = 部分支持

Values	IE	Firefox	Chrome	Safari	Opera	iOS Safari	Android Browser	Android Chrome
Basic Support	6.0-9.0	2.0-40.0	4.0-45.0^-webkit-	6.0-8.0^-webkit-	15.0-29.0^-webkit-	6.0-8.3^-webkit-	2.1-4.4.4^-webkit-	18.0-42.0^-webkit-
Basic Support	10.0+	2.0-40.0	4.0-45.0^-webkit-	6.0-8.0^-webkit-	15.0-29.0^-webkit-	6.0-8.3^-webkit-	2.1-4.4.4^-webkit-	18.0-42.0^-webkit-

示例：

<!DOCTYPE html>
<html lang="zh-cmn-Hans">
<head>
<meta charset="utf-8" />
<title>CSS column-break-before_CSS参考手册_web前端开发参考手册系列_编程学问网</title>

<style>
body{font:14px/1.5 georgia,serif,sans-serif;}
.test p,.test div{margin:0;padding:5px 10px;background:#eee;}
h1{margin:10px 0;font-size:16px;}
.test{
	width:600px;
	border:10px solid #000;
	-moz-column-count:4;
	-moz-column-gap:20px;
	-moz-column-rule:3px solid #090;
	-webkit-column-count:4;
	-webkit-column-gap:20px;
	-webkit-column-rule:3px solid #090;
	column-count:4;
	column-gap:20px;
	column-rule:3px solid #090;
}
.test div{
	-moz-column-break-before:always;
	-webkit-column-break-before:always;
	column-break-before:always;
}
</style>
</head>
<body>
<h1>column-break-before:always</h1>
<div class="test">
	<p>This module describes multi-column layout in CSS. By using functionality described in this document, style sheets can declare that the content of an element is to be laid out in multiple columns.</p>
	<div>不管上一列有没有填满，我都另起一列</div>
	<p>This module describes multi-column layout in CSS. By using functionality described in this document, style sheets can declare that the content of an element is to be laid out in multiple columns.</p>
</div>
</body>
</html>

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