Comment css

Comments are a common technique in programming that can help other developers better understand the code. In CSS, comments can also be used to explain the role and purpose of style rules. This article will explore how to make comments in CSS and their usage techniques.

1. Syntax of CSS comments

Comments in CSS start with "/" and end with "/". Comments can be written anywhere, including between style rules, properties, and values. The following is an example of a CSS comment:

/* 这是一个单行注释 */

/*
这是一个多
行注释
*/

Using comments in a style rule, we can explain the role, purpose and scope of the rule. For example:

/* 这个规则用于设置页面主体的背景颜色 */
body {
  background-color: #f0f0f0;
}

There are two situations when using annotations between attributes and values. One is to explain a certain attribute, such as:

h1 {
  /* 这个属性用于设置标题和文章之间的间距 */
  margin-bottom: 20px;
}

The other is to explain a value, such as:

p {
  font-size: 16px; /* 文字大小 */
  line-height: 1.5; /* 行高 */
}

In short, comments can make the code easier to understand. Improve development efficiency.

2. Tips for using CSS comments

1. Understand the history and background of the code

For a larger project, comments can record the history of the code and background. This is very important for new developers. For example:

/*
* 根据AMD规范编写, 用于requirejs
* @module ui/popover
*/

This kind of comment can tell other developers the history, purpose and importance of this part of the code.

2. Explanation of style rules

Comments can explain the role and purpose of the entire style rule.

/* 网站header的样式 */
.header {
  margin: 0 auto;
  width: 980px;
  height: 100px;
  background-color: #333;
  color: #fff;
}

3. Explanation of properties and values

Sometimes we need to annotate a property or value so that other developers can better understand the code. For example:

/* 这个属性用于设置标签的行内对齐方式 */
text-align: center;

4. Debugging CSS code

Comments are also very helpful for debugging CSS code. When debugging, we can use comments to exclude or lock certain errors. For example:

/* 下面的样式会将header的高度减去50px */
.header {
  height: calc(100% - 50px);
}

5. Hide code through comments

In some cases, we need to temporarily hide a certain piece of code, but do not want to delete it. This is where annotations come in handy.

/*
.header {
  margin: 0 auto;
  width: 980px;
  height: 100px;
  background-color: #333;
  color: #fff;
}
*/

With such comments, we can easily comment out a certain style rule so that it can be re-enabled later.

In short, CSS comments are a very useful technique that can improve the readability of code and avoid developer misunderstandings and errors. Using good comments can make the code more standardized, cleaner and easier to maintain.

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