示例代碼：
div{filter:alpha(opacity=50);} /* for IE8 and earlier */ div{opacity:.5;} /* for IE9 and other browsers */
以上2段代碼的效果相同
| Values | IE | Firefox | Chrome | Safari | Opera | iOS Safari | Android Browser | Android Chrome |
|---|---|---|---|---|---|---|---|---|
| Basic Support | 6.0-8.0 | 2.0+ | 4.0+ | 3.1+ | 15.0+ | 3.2+ | 2.1+ | 18.0+ |
| 9.0+ |