What is the cssnot selector? Detailed explanation of the not() selector

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not() selector

In CSS3, the :not() selector is mainly used to select all elements except a certain element. This is a very useful selector.

Example:

 

    



    

        
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The effect is as follows:

Analysis:

For "ul li:not(.first )" this selector, we look at it in two steps. The ".first" in the brackets means selecting the element with the class value first (i.e. the first li element), so "ul li:not (.first)" means Select all li elements under the ul element except the first li element.

If there is no: not() selector, it would be very troublesome for us to achieve the above effect, with a lot of redundant code. In fact: the idea of ​​using the not() selector is similar to the idea of ​​complement set in mathematics. The :not() selector is very practical and flexible in actual development.

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