What does $ mean in css

In CSS, the $ symbol is used to represent variables defined in Sass or SCSS. It is used to declare variables, reference variables, create nested rules and mixins, thereby improving the readability, maintainability, reusability and extensibility of CSS code.

The meaning of $ in CSS

In CSS, the $ symbol is a variable name prefix used to represent This variable is defined in Sass or SCSS. Sass and SCSS are preprocessor languages ​​for CSS that allow the use of advanced features such as variables, nested rules, and mixins.

$ Purpose of symbols

$ The main purposes of symbols are:

• Declare variables:Assign values to the variable. For example: $primary-color: #ff0000;.
• Reference variables: Use the value of a variable in CSS code. For example: color: $primary-color;.
• Create nested rules: Nest style rules within other rules. For example: @media (min-width: 320px) { $primary-color: #00ff00; }.
• Create mixins: Create reusable chunks of code. For example: @mixin button { display: inline-block; padding: 5px 10px; }. The difference between

$ symbols and other symbols in CSS

In CSS, the following symbols are also used to declare variables:

• --(double dash): is used to define CSS Custom Properties.
• @ (at symbol): is used to create CSS preprocessor variables (such as $).

However, the $ symbol is used exclusively with Sass and SCSS variables.

Advantages of using the $ symbol

Using the $ symbol can bring the following advantages:

• Readability:Use variables to make CSS code easier to read and understand.
• Maintainability: CSS code can be easily updated and maintained by storing values ​​centrally.
• Reusability: Variables allow values ​​to be reused throughout the project.
• Extensibility: Sass and SCSS variables support nesting and mixins, enhancing CSS extensibility.

The above is the detailed content of What does $ mean in css. For more information, please follow other related articles on the PHP Chinese website!