Why are there pseudo elements in the front end?

The reasons for pseudo elements in the front end: 1. Customize layout and design; 2. Solve layout problems; 3. Improve accessibility; 4. Implement special effects; 5. Control complex layouts. Detailed introduction: 1. Customize layout and design. In web design, we often hope to have some special layout and design effects, such as adding a logo in front of a list item, adding a focus indicator inside a button, etc.; 2. Solving layout problems , sometimes you encounter some layout problems that are difficult to deal with, such as text wrapping effects, alignment of pictures and text, etc. Using pseudo elements, you can accurately control etc.

The operating system for this tutorial: Windows 10 system, DELL G3 computer.

In front-end development, pseudo-element is a very useful CSS technology, which allows us to select and manipulate certain parts of elements that cannot be directly selected in HTML. There are many reasons for using pseudo elements, and I will explain them in detail from several aspects below.

1. Customized layout and design

In web design, many times we hope to have some special layout and design effects, such as adding a logo in front of a list item and adding focus inside a button. Indicators etc. Using pseudo-elements, we can achieve these effects without adding additional HTML tags. For example, you can use the :before and :after pseudo-elements to add content at the beginning and end of page elements to achieve some special design effects.

2. Solve layout problems

Sometimes, we will encounter some layout problems that are difficult to deal with, such as text wrapping effects, alignment of pictures and text, etc. Using pseudo-elements, we can precisely control the position and style of these elements, thus solving these layout problems. For example, use the :before and :after pseudo-elements to add decorative content before and after the content of page elements, thereby affecting the layout.

3. Improve accessibility

For visually impaired users, the accessibility of web pages is very important. Using pseudo-elements, we can add additional style cues to links, list items, etc. in the page, such as adding underlines, changing colors, etc., thereby improving the accessibility of the page for these users.

4. Implement special effects

Sometimes, we need to implement some special effects on the page, such as adding comments at specific locations, highlighting certain text, etc. Using pseudo elements, we can easily achieve these effects. For example, use the :before and :after pseudo-elements to add decorative content or comments at specific locations on page elements to achieve special effects.

5. Control complex layout

In some complex page layouts, using pseudo elements can help us better control the arrangement and distribution of elements. For example, use the :before and :after pseudo-elements to add decorative content or markup at the beginning and end of page elements, thereby affecting the arrangement and distribution of elements.

In short, in front-end development, pseudo elements are a very practical technology. It can help us better control the layout and style of the page, solve some specific layout problems, and improve the accessibility of the page. , to achieve some special effects, etc. Although modern front-end development has richer layout and style selectors, pseudo-elements are still a very useful tool that allows us to achieve some special effects and needs more conveniently and quickly.

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