What are the basic data types of css

CSS basic data types include numeric type, color type, string type, identifier type, URL type, numeric type, percentage type, Boolean type and custom data type. Detailed introduction: 1. Numeric type, including length unit and percentage; 2. Color type, including hexadecimal color value, RGB color value, RGBA color value, HSL color value and HSLA color value; 3. String type, such as ' Arial', "Helvetica Neue", sans-serif; 4. Identifier type, etc.

The operating system for this tutorial: Windows 10 system, css3.0 version, DELL G3 computer.

CSS (Cascading Style Sheets) is a language used to describe the appearance and style of web pages. In CSS, there are some basic data types that are used to define and describe the values ​​of style attributes. The following are the basic data types of CSS:

1. Numeric types: including length units and percentages. Units of length include pixels (px), points (pt), inches (in), centimeters (cm), millimeters (mm), etc. Percentage is used for length or width relative to the parent element.

2. Color type: including hexadecimal color value (#RRGGBB), RGB color value (rgb(red, green, blue)), RGBA color value (rgba(red, green, blue, alpha)), HSL color values ​​(hsl(hue, saturation, lightness)) and HSLA color values ​​(hsla(hue, saturation, lightness, alpha)).

3. String type: used to describe text, font name, etc. Strings need to be wrapped in quotation marks, such as 'Arial', "Helvetica Neue", sans-serif.

4. Identifier type: Identifier used to describe CSS attribute values, such as the font name in font-family.

5. URL type: used to reference external resources. For example, you can use url() in the background-image attribute to reference the URL of the background image.

6. Numeric type: used to represent numerical values, which can include integers or decimals.

7. Percent type: used to set the relative length value, usually representing the percentage relative to the parent element.

8. Boolean type: represents true or false, such as visible and hidden.

9. Custom data types: Users can customize some data types, such as custom attribute values.

In CSS, these basic data types are widely used in setting various attribute values. For example, numeric types, color types, string types, etc. will be used to define attributes such as font size, color, border width, and background images. For each basic data type, there are corresponding syntax and format requirements, and users need to correctly use and combine these data types according to their characteristics to achieve the desired style effect.

In addition to basic data types, CSS also has some composite data types, such as length and percentage, shadow, etc., which are composed of multiple basic data types and are used to describe more complex style attribute values. Mastering the basic data types of CSS is crucial to the rational use of CSS language to write exquisite interface styles. Therefore, how to use these data types skillfully is an important content that Web front-end developers need to continuously learn and practice.

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