opacity · CSS 3.0参考手册.chm

# opacity **版本：CSS3** ### 语法： *<length>* | inherit ### 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。默认值为：1 inherit：默认继承。 ### 说明：由浮点数字和单位标识符组成的长度值。不可为负值。声明用来设置一个元素的透明度，opacity取值为1的元素是完全不透明的，反之，取值为0是完全透明的，看不见的。1到0之间的任何值都表示该元素的透明程度。 ### 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_55e5d38568d3c.png" alt="IE" />Internet Explorer</th> <th class="type_firefox"><img src="https://box.kancloud.cn/2015-09-02_55e5d3857210f.png" alt="Firefox" />Firefox</th> <th class="type_chrome"><img src="https://box.kancloud.cn/2015-09-02_55e5d3857b4d9.png" alt="Chrome" />Chrome</th> <th class="type_opera"><img src="https://box.kancloud.cn/2015-09-02_55e5d3858296a.png" alt="Opera" />Opera</th> <th class="type_safari"><img src="https://box.kancloud.cn/2015-09-02_55e5d3858be47.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 yes"><span>(√)</span>Firefox 3.0.10</td> <td class="support yes"><span>(√)</span>Chrome 2.0.x</td> <td class="support yes"><span>(√)</span>Opera 9.64</td> <td class="support yes"><span>(√)</span>Safari 4</td> </tr><tr><td class="support no"><span>(×)</span>IE7</td> <td class="support yes"><span>(√)</span>Firefox 3.5</td> <td></td> <td></td> <td></td> </tr><tr><td class="support no"><span>(×)</span>IE8</td> <td></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_55e5d38594b5d.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" /><style>img.opacity1 { opacity:0.25;}img.opacity2 { opacity:0.50;}img.opacity3 { opacity:0.75;}</style><title>opacity</title></head><body><div><img src="http://imgcache.qq.com/ac/www_tencent/zh-cn/images/sitelogo_zh-cn.gif" class="opacity1" alt="tencent" /></div><div><img src="http://imgcache.qq.com/ac/www_tencent/zh-cn/images/sitelogo_zh-cn.gif" class="opacity2" alt="tencent" /></div><div><img src="http://imgcache.qq.com/ac/www_tencent/zh-cn/images/sitelogo_zh-cn.gif" class="opacity3" alt="tencent" /></div></body></html> 复制代码 Copyright © 2009 [Tencent ISD webteam](http://webteam.tencent.com/). All Rights Reserved ### 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”")