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Editor to share with you what the meaning of css, I believe that most people do not know much about it, so share this article for your reference, I hope you will learn a lot after reading this article, let's go to understand it!

Cascading style sheets (CSS) are standards (or languages) that describe markup language page formats, and CSS enables developers to separate content from visual elements for better page control and flexibility. CSS files are usually attached to HTML files through links in HTML files. CSS can not only modify the web page statically, but also format the elements of the web page dynamically with various scripting languages.

CSS defines the format of the following document types:

Hypertext markup language (HTML)

Extensible Hypertext markup language (XHTML)

Extensible markup language (XML)

Scalable Vector Graphics (SVG)

XML user Interface language (XUL)

In December 1998, the World wide Web Consortium (W3C) released the first CSS specification (CSS1). Followed by CSSLevel2 (CSS2) and CSSLevel2,Revision1 (CSS2.1)

Because of the built-in HTML style attributes, HTML document formatting before CSS is tedious and complex.

Specifically, style tags require detailed and repetitive descriptions of the following elements:

Font, color, background, style, elements, alignment, national boundaries, size.

CSS defines headings (H2), subheadings (h3), subheadings (h4) and other elements in structure.

Element options can be used for font, color, emphasis, size, etc.

CSS allows developers to move style elements to a separate HTML area for clean marking.

For example, if the developer wants to change the font of all h3 headings in the HTML file, he can make a single change to the attached CSS file.

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