What does css refer to?

css refers to cascading style sheets. It is a computer language used to express file styles such as HTML or XML. It is a programming language used to express html styles. It can be used to make web pages and content A separate style language; mainly used to design the style of web pages and beautify web pages.

The operating environment of this tutorial: Windows 7 system, CSS3 version, Dell G3 computer.

CSS (Cascading Style Sheets), it is a computer language used to express file styles such as HTML or XML. It is a programming language used to express html styles. It can be done A style language that separates web pages and content.

CSS can not only statically modify web pages, but also dynamically format various elements of web pages in conjunction with various scripting languages.

CSS can perform pixel-level precise control over the layout of element positions in web pages, supports almost all font size styles, and has the ability to edit web page objects and model styles.

CSS provides a style description for the HTML markup language, defining how elements in it are displayed. CSS is a breakthrough in the field of web design. It can be used to modify a small style to update all page elements related to it.

CSS has the following characteristics:

• Rich style definition

  CSS provides a rich document style appearance, as well as the ability to set text and background properties ; Allows you to create a border for any element, as well as the distance between the element border and other elements, as well as the distance between the element border and the element content; allows you to freely change the capitalization, decoration, and other page effects of text.

• Easy to use and modify

  CSS can define the style in the style attribute of the HTML element, or in the header part of the HTML document, or in the Styles are declared in a special CSS file for reference in HTML pages. In short, CSS style sheets can store and manage all style declarations in a unified manner.

  In addition, elements of the same style can be classified and defined using the same style, you can also apply a certain style to all HTML tags with the same name, or you can assign a CSS style to a certain in page elements. If we want to modify the style, we only need to find the corresponding style statement in the style list and modify it.

• Multi-page application

  CSS style sheet can be stored in a separate CSS file, so that we can use the same CSS style sheet in multiple pages. Theoretically, CSS style sheets do not belong to any page file and can be referenced in any page file. In this way, the styles of multiple pages can be unified.

• Cascading

  Simply put, cascading is to set the same style multiple times on an element, which will use the last attribute value set. For example, if you use the same set of CSS style sheets for multiple pages in a site, and if you want to use other styles for some elements in some pages, you can define a separate style sheet for these styles and apply them to the page. These styles defined later will override the previous style settings, and what you see in the browser will be the style effect set last.

• Page compression

  In websites that use HTML to define page effects, a large number or repeated tables and font elements are often required to form text styles of various specifications. The consequence is that a large number of HTML tags will be generated, thereby increasing the size of the page file. Putting the style declaration separately in the CSS style sheet can greatly reduce the size of the page, so the time spent loading the page will also be greatly reduced. In addition, the reuse of CSS style sheets reduces the size of the page to a greater extent and reduces the download time.

(Learning video sharing:css video tutorial)

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