What is the grammatical structure of css?

body {background-color:blue;}

Description:

The body{} above is a type selector. The so-called type selector refers to a selector whose name is based on an existing tag type in a web page, body is a tag type in a web page, so is div, and so is span. So the following selectors are all type selectors, and they will control all body or div or span in the page:

body{}
 div{}
 span{}

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