属性选择符有四种匹配方式。

Attribute selectors may match in four ways.

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例如，如下的属性选择符匹配那些指定了“ title ”属性的H1元素，而不论其值为什么？

For example, the following attribute selector matches all H1 elements that specify the "title" attribute, whatever its value.

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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.

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