What is the difference between pseudo-class and pseudo-element?

The difference between pseudo-classes and pseudo-elements is: 1. Pseudo-classes are used to add some special effects to certain elements, while pseudo-elements are used to add some content before or after certain elements. or style; 2. Pseudo-classes are usually represented by a single colon ":", while pseudo-elements are usually represented by a double colon "::".

# Operating system for this tutorial: Windows 10 system, Dell G3 computer.

Pseudo-classes and Pseudo-elements are two different CSS selectors. Although their names are similar, their functions and usage are different.

Pseudo-classes are used to add some special effects to certain elements, such as changing the color of the link when the user hovers the mouse over the link, changing the background color of the element when the element is clicked, etc. Pseudo-classes are usually represented by a single colon (:), such as :hover, :active, etc.

Pseudo elements are used to add some content or style before or after certain elements, such as adding a small icon in front of the element, adding some text after the element, etc. Pseudo elements are usually represented by double colons (::), such as ::before, ::after, etc.

Therefore, the main difference between pseudo-classes and pseudo-elements is that pseudo-classes are used to add some special effects, while pseudo-elements are used to add some content or style. In addition, pseudo-classes are matched based on the state of the element, while pseudo-elements are created based on the position of the element.

In short, pseudo-classes and pseudo-elements are very useful CSS selectors. They can help developers achieve some special effects and layouts, making web pages richer and more diverse.

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