what does css mean

The meaning of CSS

CSS, the full name of Cascading Style Sheets, is a style sheet language used for style control of web pages. CSS can separate the content and style of a web page, thereby improving the readability and maintainability of web pages, and making web pages download and load faster. CSS can be applied to a variety of media, such as screen, print, and mobile devices.

The development history of CSS

In 1994, Håkon Wium Lie and Bert Bos proposed the first version of CSS, and it became a W3C recommended standard in 1996. Since then, CSS has gone through multiple versions of updates and improvements, such as CSS2, CSS3, etc.

Style attributes of CSS

There are nearly a hundred style attributes of CSS, the most common of which include:

1. Font attributes: including font size, font style , font thickness, etc.;
2. Color attributes: including text color, background color, etc.;
3. Box model attributes: including borders, inner and outer margins, width, height, etc.;
4. Positioning attributes: including positioning method (relative or absolute), offset, etc.;
5. Background attributes: including background color, picture, position, etc.;
6. Display attributes: including block-level elements and inline How the element is displayed.

CSS selector

CSS selector is used to select elements on the page that need to be styled. Common selectors include:

1. ID selector: identified with #, used to select a unique element;
2. Class selector: identified with ., used to select multiple elements Elements with the same class name;
3. Tag selector: identified by tag name, used to select elements of a certain type;
4. Sibling selector: use or ~ to connect two selectors, use Used to select two adjacent or any sibling elements;
5. Descendant selector: Use a space to connect two selectors, used to select all child elements under a certain element.

Advantages of CSS

The advantages of CSS are:

1. Good readability: CSS can separate the content and style of the web page, thereby making the web page The code is easier to read and maintain;
2. High maintainability: CSS can make the style of the web page consistent throughout the website, thereby reducing the difficulty of maintenance work;
3. High accessibility : CSS can provide a better access experience for the visually impaired, making the website easier to be indexed by search engines;
4. Fast loading speed: CSS can load the page's style into the browser cache, thereby improving the page's Loading speed;
5. Good compatibility: CSS can be applied to a variety of devices and media types, and is not affected by factors such as browser versions.

Summary

CSS is an essential part of web design, which can provide a beautiful appearance and a good user experience for web pages. Mastering the basic knowledge and skills of CSS is very necessary for web designers. I hope this article can help readers understand and master CSS-related knowledge.

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