Why big websites don't use pseudo elements

The reasons why large websites do not use pseudo elements: 1. Maintenance and readability; 2. Browser compatibility; 3. Performance considerations; 4. Style reuse and componentization; 5. Semanticization and SEO, etc. . Detailed introduction: 1. Maintenance and readability. Large websites usually have huge code bases, which contain a large amount of CSS and JavaScript codes. Using pseudo elements may make the code structure more complex and reduce the readability and readability of the code. Maintainability; 2. Browser compatibility. Although modern browsers have good support for pseudo elements, there are still some old browsers and so on.

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

In front-end development, pseudo-element is a very useful technology, which allows us to select and operate certain elements that cannot be directly selected in HTML. However, some large websites do not use pseudo elements, mainly for the following reasons:

1. Maintenance and readability: Large websites usually have huge code bases, which contain a lot of CSS and JavaScript code. . Using pseudo-elements may make the code structure more complex and reduce the readability and maintainability of the code. In this case, it is crucial to choose a clearer and easier-to-understand code structure.

2. Browser compatibility: Although modern browsers have good support for pseudo elements, there are still some old browsers or specific versions of browsers that may not support pseudo elements. If your website needs to support these browsers, using pseudo-elements may cause compatibility issues. In this case, using more commonly supported CSS properties and selectors may be a more reliable option.

3. Performance considerations: Although the use of a single pseudo element may have little impact on page performance, using a large number of pseudo elements on large websites may increase page loading time and memory consumption. For large websites, optimizing performance is very important, so you may choose to avoid unnecessary pseudo-elements.

4. Style reuse and componentization: Large websites usually adopt style reuse and componentization development methods to reduce duplication of work and improve efficiency. Using pseudo-elements can make styles difficult to reuse and componentize because they define styles for specific parts of specific elements. In this case, using more reusable and component-based CSS properties and selectors may be a better choice.

5. Semanticization and SEO: Although pseudo-elements do not affect the actual structure and content of the page, they are not part of HTML. This means that using pseudo-elements may reduce the semantics of the page, which may be detrimental to search engine optimization (SEO). Large websites often take SEO and accessibility seriously and may avoid pseudo-elements. To improve SEO and accessibility, large websites may choose to use more semantic HTML tags and attributes, as well as use appropriate alt text and other accessibility measures.

In addition, some large websites may use front-end frameworks or libraries to build their interfaces. These frameworks or libraries usually provide their own style and layout system and may not directly support the use of pseudo-elements. Therefore, in these cases it may be more appropriate to use specific components and styles provided by the framework.

It should be noted that these reasons do not mean that pseudo-elements have no place at all in large-scale website development. In fact, some large websites still use pseudo elements to enhance the style and layout of the page. However, their use is restricted and generally limited to situations where they have a small impact on performance, do not break semantics and accessibility, and do not lead to code that is cluttered and difficult to maintain.

To sum up, although pseudo-elements have certain uses in front-end development, for large websites, due to maintenance and readability, browser compatibility, performance, style reuse and componentization, As well as semantic and SEO considerations, they may choose to limit or avoid the use of pseudo-elements. In the specific development process, it is necessary to decide whether to use pseudo elements and other front-end technologies based on project needs and actual conditions.

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