选择器的权重

选择器的权重(优先级自上到下,由高到低)

                内联样式            1,0,0,0

                id选择器            0,1,0,0

                类和伪类选择器      0,0,1,0

                元素选择器          0,0,0,1

                通配选择器          0,0,0,0

                继承的样式          没有优先级


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