What are the pseudo-classes and pseudo-elements in CSS? What is the use? (with code)

This article mainly introduces to you a summary of the usage of pseudo-classes and pseudo-elements in css.

css, also known as cascading style sheets, can not only statically modify web pages, but also dynamically format various elements of web pages in conjunction with various scripting languages.

So what are the css pseudo-classes and pseudo-elements? what's the function?

CSS pseudo-classes are used to add special effects to certain selectors. CSS pseudo-elements are used to set special effects to certain selectors.

Let’s summarize the css pseudo-classes and pseudo-elements.

Pseudo class:

:active, adds styles to activated elements.

:focus, adds style to the selected element.

:hover, when the mouse is hovering over the element, add a style to the element.

:link, add special styles to unvisited links.

:visited, adds special styles to visited links.

:first-child, adds special styles to the first child element of the element.

:lang, allows the author to define the language used in the specified element.

Pseudo-element:

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

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

:before, insert some content before an element.

:after, insert some content after an element.

This article is a summary of CSS pseudo-classes and pseudo-elements. I hope it will be helpful to friends in need!

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