How to comment in css

CSS (Cascading Style Sheets) is a web style sheet language that can be used to control the appearance and format of web pages. When developing web pages, we often need to annotate styles so that ourselves and other developers can understand and maintain the code. This article will introduce how to annotate in CSS and provide some best practices for annotations.

1. The format of CSS comments

CSS comments are a technology that improves readability and maintainability by adding instructions to the code. CSS comments always start with / and end with /. Nothing in the comments will be parsed or rendered by the browser. This means that whenever comments are added, they do not change the look or behavior of the page.

The following is an example of a basic CSS comment:

/* 这是一个注释 */

Comments can be single or multiple lines. Single-line comments start with // and continue until the end of the line. Multiline comments start with /, end with /, and span multiple lines.

The following are examples of single-line and multi-line comments:

/* 这是一个多行注释
可以跨越多行 */

/* 这是一个单行注释 */

2. Best practices for comments

Good comments can make the code easier to understand and maintain. Here are some best practices for CSS comments:

1. Documented Code

Comments should explain the purpose and meaning of the code, rather than simply describing the code itself. In the comments, you should explain what the code is there for and how it interacts with other parts of the page or website. Notes should also include useful information such as author, version, date, etc.

2. Use comments carefully

The purpose of comments is to improve the readability and maintainability of the code. However, if there are too many comments or they are too verbose, they can become an obstacle to reading the code. Comments should provide necessary context and information, but don't rely too heavily on comments.

3. Comment at the beginning of the code

It is usually best to add comments at the beginning of the code block. This helps readers quickly understand the overall purpose and structure of the code. You can also add more detailed comments to the code if the code block is large or complex.

4. Update comments

If the code has changed, please make sure to update the corresponding comments. Comments should be kept in sync with the code to ensure that the code is accurate, reliable, and understandable. If the purpose or functionality of the code has fundamentally changed, consider removing existing comments and re-explaining the code's new purpose and functionality.

3. Summary

CSS comments are a practical technology to improve code readability and maintainability. Comments should document code, be used with care, comment at the beginning of code, and update comments. Use these best practices to make your code easier to understand, maintain, and adjust.

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