比如 利用background简写属性，其中可以写-size -position 那么就出现了两个可以用px表示的值，那么我应该如何处理呢？它是怎么识别我的顺序的。好困惑。。。。
回复讨论(解决方案)
要按规定的顺序写
语法如下
background：[ , ]*
= [ background-image ] || [ background-position ] [ / background-size ]? || [ background-repeat ] || [ background-attachment ] || [ [ background-origin ] || [ background-clip ] ]{1,2}
= [ background-color ] || [ background-image ] || [ background-position ] [ / background-size ]? || [ background-repeat ] || [ background-attachment ] || [ [ background-origin ] || [ background-clip ] ]{1,2}
就是background-position / background-size
background-position要写在 / 的前面
background-size要写在 / 的后面
如果只有background-position 就不写 /
要写background-size 就必须写background-position
太谢谢了~涨姿势啦
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