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透明色的rgb值是什么?

background-color没有设置时,它的默认值是transparent,不可以继承父元素的取值。
请问,这个透明色的rgb值是什么?


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用rgba,第四个参数为透明度 0-1,设置为0就是100%透明。background:rgba(0,0,0,0);


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