包含一个简单选择符的选择符,匹配任意符合它要求的元素。
A selector consisting of a single simple selector matches any element satisfying its requirements.
一个简单选择符或者是一个类型选择符,或者是一个全局选择符,紧跟在后的是零个或多个属性选择符,ID选择符或伪类,次序任意。
A simple selector is either a type selector or universal selector followed immediately by zero or more attribute selectors, ID selectors, or pseudo-classes, in any order.
It's a little bit complicated, so I chose the simplest bias.
这有点复杂,所以我选择了一个简单的偏向值。
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