What are the advantages of CSS external styles?

Using external CSS style sheet files in web pages has the following advantages:

1. It is independent of HTML files, easy to modify.

2. Multiple files can reference the same CSS style sheet file.

3. The CSS style file only needs to be downloaded once, and it can be used in other pages linked to the file.

4. The browser will display the HTML content first, and then render it according to the CSS style file, so that visitors can see the content faster.