Rules with a tag selector as the key.
标签选择器作为键的规则。
Perhaps the most commonly used selector is the type selector, though most people think of it as a tag name or element selector.
最常用的选择符可能是类型选择符，但是大多数人把它称为标记名或元素选择符。
So the selector for the style starts with the HTML tag and is followed by an extension that describes the style.
样式的选择符以这个HTML标记开头，后面是一个描述这个样式的扩展。
You can also omit the tag name in the selector to define a style that will be used by all HTML elements that have a certain class.
如果你需要定义所有HTML元素中的某个类，需要将标签名去掉，如下例所示。
You can also omit the tag name in the selector to define a style that will be used by all HTML elements that have a certain class.
如果你需要定义所有HTML元素中的某个类，需要将标签名去掉，如下例所示。
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