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.

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。

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You can see the rules using ID, class, and element selectors matching parts of Listing 1.

可以看到，样式表规则使用ID、类和元素选择器匹配清单1的各部分内容。

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You can refer to Figure 2 to quickly check the CSS syntax for HTML, ID, and class selectors.

可以参考图2，了解HTML、ID和类选择符的css语法。

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