CSS selector:
1. Tag selector: set the same CSS format for all HTML tags.
2. Category selector: for example. class {color: green; font-size: 20px} class is the class name, color and font-size are the attributes, and green and 20px are the values corresponding to the attributes.
3. ID selector: used for a special tag on a page. For example, # ID {color: green; font-size: 20px}
4. collective declaration of selectors: selectors of different categories use the same CSS style.
5. nesting Declaration of the CSS selector: for example, p B {color: green} specifies a style for HTML <p> <B> </B> </P> to the content marked with B.
6. CSS sub-selector: ul. mylist> LI> A {color: Green} <body>
<UI/>
</Body>
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