!important是CSS1就定义的语法， 作用是提高指定样式规则的应用优先权 。
语法格式：{ cssRule !important }，即将!important写在定义的最后面，
例如：
box{color:red !important;}
兼容性：
应用场景：
场景一：
The daimler executive familiar with the collaboration said daimler and byd might display a prototype of the jointly developed car as early as the paris auto show in october. 熟悉合作情况的戴姆勒高管说，戴姆勒和比亚迪最早有可能于10月份在巴黎车展上展出这款合作开发汽车的样车。
The daimler executive familiar with the collaboration said daimler and byd might display a prototype of the jointly developed car as early as the paris auto show in october. 熟悉合作情况的戴姆勒高管说，戴姆勒和比亚迪最早有可能于10月份在巴黎车展上展出这款合作开发汽车的样车。
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