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使用用户自定义标识名作为组件取值。
自定义标识区分大小写，例如test与TEST是2个不同的值
自定义标识不能使用与CSS属性及属性值相同的名字
正常工作的例子：
示例代码：
li { counter-increment:testname; } li { counter-reset:testname2; } @keyframestestanimations{ from { opacity:1; } to { opacity:0; } }无法工作的例子：
示例代码：
li { counter-increment:border; } li { counter-reset:background; } @keyframesauto{ from { opacity:1; } to { opacity:0; } }
兼容性：
| IE | Firefox | Chrome | Safari | Opera | iOS Safari | Android Browser | Android Chrome |
|---|---|---|---|---|---|---|---|
| 6.0-7.0 | 2.0+ | 4.0+ | 3.1+ | 3.5+ | 3.2+ | 2.1+ | 18.0+ |
| 8.0+ |