what does css mean

CSS, the full name of "Cascading Style Sheets", is a language used to set the style of HTML pages (or XML and other documents). The emergence of CSS technology makes web design more flexible, allowing developers to separate HTML and CSS, making it easier to modify and manage web pages. The emergence of CSS has also made web pages more readable and maintainable.

CSS was originally designed to format the appearance of HTML documents. With the development of Internet technology, the fields of CSS application are becoming more and more extensive. Currently, CSS can be used not only for web design, but also for graphical user interface (GUI) design, including mobile device application design and user interaction design.

CSS is mainly composed of two parts: selector and declaration part. The selector specifies the HTML element to which the style will be applied, while the declaration part defines the style to be applied. The declaration part contains attributes and values ​​as follows:

p {
  color: blue;
  font-size: 16px;
  font-family: Arial, sans-serif;
}

In the above example, the selector p specifies that the style is to be applied to the paragraph element, while the declaration part defines The element's color, font size, and font type.

CSS styles can be applied in three ways: inline style sheets, embedded style sheets, and external style sheets. Inline style sheets define styles directly in HTML tags, embedded style sheets are placed in a style tag in the HTML document, and external style sheets are referenced through external CSS files. Among them, external style sheets are the most commonly used method because it can make web design more modular and make the maintenance and management of web styles more convenient.

The prospects of CSS application are very broad. It can not only change the layout and color of web pages, but also be used for animation effects, responsive design and user interaction. The continuous development of CSS technology has also given rise to the emergence of various front-end frameworks and tools, such as Bootstrap, Foundation, Sass, and Less.

In short, CSS is an evolving technology that provides web designers with more choices and more flexibility. Through proficiency in CSS, developers can more easily create beautiful and easy-to-maintain web pages.

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