# Border-radius
**版本:CSS3**
继承性:无
### 语法:
**border-radius** : none | <length>{1,4} [ / <length>{1,4} ]?
**相关属性**: border-top-right-radius , border-bottom-right-radius , border-bottom-left-radius , border-top-left-radius
### 取值:
*<length>*:由浮点数字和单位标识符组成的长度值。不可为负值。 border-top-left-radius:由浮点数字和单位标识符组成的长度值。不可为负值。
### 说明:
1. 第一个值是水平半径。
1. 如果第二个值省略,则它等于第一个值,这时这个角就是一个四分之一圆角。
1. 如果任意一个值为0,则这个角是矩形,不会是圆的。
1. 值不允许是负值。
| 引擎类型 | Gecko | Webkit | Presto |
|-----|-----|-----|-----|
| Border-radius | -moz-border-radius | -webkit-border-radius | |
| border-bottom-left-radius | -moz-border-radius-bottomleft | -webkit-border-bottom-left-radius | |
| border-bottom-right-radius | -moz-border-radius-bottomright | -webkit-border-bottom-right-radius | |
| border-top-left-radius | -moz-border-radius-topleft | -webkit-border-top-left-radius | |
| border-top-right-radius | -moz-border-radius-topright | -webkit-border-top-right-radius | |
### 兼容性:
<table><thead><tr><th class="type">类型</th> <th class="type_ie"><img src="https://box.kancloud.cn/2015-09-02_55e5d38407c28.png" alt="IE" />Internet Explorer</th> <th class="type_firefox"><img src="https://box.kancloud.cn/2015-09-02_55e5d3841152c.png" alt="Firefox" />Firefox</th> <th class="type_chrome"><img src="https://box.kancloud.cn/2015-09-02_55e5d384186b4.png" alt="Chrome" />Chrome</th> <th class="type_opera"><img src="https://box.kancloud.cn/2015-09-02_55e5d3841f8ff.png" alt="Opera" />Opera</th> <th class="type_safari"><img src="https://box.kancloud.cn/2015-09-02_55e5d3842763e.png" alt="Safari" />Safari</th> </tr></thead><tbody><tr><td rowspan="4" class="version">版本</td> <td class="support no"><span>(×)</span>IE6</td> <td class="support no"><span>(×)</span>Firefox 2.0</td> <td class="support yes"><span>(√)</span>Chrome 1.0.x</td> <td class="support no"><span>(×)</span>Opera 9.64</td> <td class="support yes"><span>(√)</span>Safari 3.1</td> </tr><tr><td class="support no"><span>(×)</span>IE7</td> <td class="support yes"><span>(√)</span>Firefox 3.0</td> <td class="support yes"><span>(√)</span>Chrome 2.0.x</td> <td></td> <td class="support yes"> </td> </tr><tr><td class="support no"><span>(×)</span>IE8</td> <td class="support yes"><span>(√)</span>Firefox 3.5</td> <td></td> <td></td> <td></td> </tr><tr><td></td> <td></td> <td></td> <td></td> <td></td> </tr></tbody></table>
### 示例:
![](https://box.kancloud.cn/2015-09-02_55e5d3842f178.png)
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><meta http-equiv="Content-Language" content="utf-8" /><meta name="robots" content="all" /><meta name="author" content="Tencent-ISRD" /><meta name="Copyright" content="Tencent" /><title>Border-radius</title></head><body><div style="border-width: 1px;border-style: solid;-moz-border-radius: 11px;-khtml-border-radius: 11px;-webkit-border-radius: 11px;border-radius: 11px;padding:5px;">在Firefox和Safari 3的浏览器里能看到圆角效果</div></body></html>
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### 快速跳转
- [语法](# "跳转到“语法”")
- [取值](# "跳转到“取值”")
- [说明](# "跳转到“说明”")
- [兼容性](# "跳转到“兼容性”")
- [示例](# "跳转到“示例”")
- CSS3 Properties
- 边框(Border)
- Border-color
- Border-image
- Border-radius
- box-shadow
- 背景(Background)
- background-origin
- background-clip
- Background-size
- Multiple backgrounds
- 颜色(Color)
- HSL colors
- HSLA colors
- opacity
- RGBA colors
- 文本(Text effects)
- text-shadow
- text-overflow
- word-wrap
- 用户界面(User-interface)
- box-sizing
- resize
- outline
- outline-width
- outline-style
- outline-offset
- outline-color
- nav-index
- nav-up
- nav-right
- nav-down
- nav-left
- 基础盒模型(Basic box model)
- overflow
- overflow-x
- overflow-y
- 内容(Generated Content)
- content
- 其它模块(Other modules)
- media queries
- Speech
- columns
- column-width
- column-span
- column-rule
- column-rule-color
- column-rule-width
- column-rule-style
- column-gap
- column-fill
- column-count
- column-break-before
- column-break-after
- @font-face
- 选择器(selectors)
- 子串匹配的属性选择符 E[att^="val"]
- 子串匹配的属性选择符 E[att$="val"]
- 子串匹配的属性选择符 E[att*="val"]
- 结构性伪类 E:root
- 结构性伪类 E:nth-child(n)
- 结构性伪类 E:nth-last-child(n)
- 结构性伪类 E:nth-of-type(n)
- 结构性伪类 E:nth-last-of-type(n)
- 结构性伪类 E:last-child
- 结构性伪类 E:first-of-type
- 结构性伪类 E:only-child
- 结构性伪类 E:only-of-type
- 结构性伪类 E:empty
- UI元素状态伪类 E:checked
- UI元素状态伪类 E:enabled
- UI元素状态伪类 E:disabled
- UI元素状态伪类 E::selection
- 否定伪类 E:not(s)
- 目标伪类 E:target
- 通用兄弟元素选择器 E ~ F