You can group selectors. Separate each selector with a comma. In the example below we have grouped all the header elements.

你可以将多个选择器组合在一起，用逗号链接。

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Also notice the use of group selectors, where two or more selectors are grouped together to have the same style declarations.

还要注意组选择符，也就是两个或更多的选择符组合在一起，使用相同的样式声明。

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