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This article introduces the knowledge of "what are pseudo-classes and pseudo-elements in CSS". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

The CSS pseudo-class is used to add special effects to some selectors. CSS pseudo elements are used to set special effects to some selectors.

Pseudo class:

: active to add styles to the active element.

: focus to add a style to the selected element

Hover, when the mouse hovers over the element, adds a style to the element.

: link to add special styles to links that have not been accessed

: visited to add a special style to the visited link

: first-child, adding a special style to the first child of the element

Lang, which allows the creator to define the language used in the specified element.

Pseudo elements:

: first-letter, adding a special style to the first letter of the text

: first-line, adding a special style to the first line of the text

: before, inserting something before an element

: after, insert something after an element.

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