CSS optimization causes and methods to improve performance

1. Reduce the occupation of web bytes and speed up the opening of web pages. 2. Simplify and standardize CSS code for future maintenance. 3. Make your CSS code professional. Improving performance 1. Merge CSS files. 2. Reduce CSS nesting, preferably not more than three layers. 3. Create a public style class, extract the same style as a public class to use, such as we commonly used to clear float. 4. Split out the common CSS file. Extract the common structure styles of most pages into a single CSS file. 5. Use cssSprite to combine multiple images into one.