What does css mean in English?

The full English name of css is Cascading Style Sheets, which means cascading style sheets. It is also called string style list, cascading style sheet, cascading style sheet, and hierarchical style sheet. It is a type of structure used to A computer language for adding styles to documents, defined and maintained by the W3C.

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

What does css mean in English?

Cascading Style Sheets (English: Cascading Style Sheets, abbreviation: CSS; also known as string style list, cascading style sheet, string Linked style sheet, hierarchical style sheet) is a computer language used to add styles (fonts, spacing, colors, etc.) to structured documents (such as HTML documents or XML applications), and is defined and maintained by the W3C.

CSS is divided into different levels: CSS1 is now obsolete, CSS2.1 is a recommended standard, and CSS3 is divided into multiple small modules and is being standardized. [Source Request] CSS3 is now supported by most modern browsers, while the next version, CSS4, is still under development.

Overview

CSS cannot be used alone, it must work together with HTML or XML to decorate HTML or XML. This article mainly introduces CSS technology used to decorate HTML web pages. HTML is responsible for determining what content is in the web page, and CSS determines how to display these elements (size, thickness, color, alignment and position). CSS can be used to set page layout, style page elements, and set global styles that apply to all web pages. CSS can be added sporadically directly to the web page elements to which styles are to be applied, or it can be integrated into the web page, linked to the web page, or imported into the web page.

The most important goal of CSS is to separate the content of a file from its display. Before the advent of CSS, almost all HTML files contained information for the file display. For example, the color of the font, what the background should be, how to arrange it, edges, connections, etc. all had to be listed one by one in the HTML file. Sometimes List repeatedly. CSS allows authors to isolate much of this information, simplifying the HTML file and placing it in a secondary file written in the CSS language. HTML files only contain structure and content information, CSS files only contain style information.

For example, the second-level heading H2 mark in HTML is lower in level than the first-level heading H1 and higher than the third-level heading H3. This information is all structural information.

Generally speaking, the higher the level of the title, the larger the font. H1 has the largest font, because generally speaking, the larger the font, the more important the content it represents. In addition, general titles use bold fonts. Highlight their importance. Generally speaking, H2 uses bold fonts, and its font is larger than H3 and smaller than H1. This information is for display.

Before the advent of CSS, if the author wanted to determine the color, font, size or other display characteristics of the H2 title, he would have to use the font or other style instructions in HTML. H2 alone was not enough, because H2 is just a structure instruction. If a title requires italics, red characters, and a white background, the author should write it like this:

<H2><font color="red" bgcolor="white"><i>使用CSS</i></font></H2>

These display instructions make an HTML very complex and difficult to maintain. If all second-level titles had to be displayed in this way, the instructions for all second-level titles would have to be this complicated. Furthermore, readers cannot change these rules. If a reader prefers blue headings, he cannot change the color of the headings because the author of the document specifies the color of the headings.

If you use CSS, the H2 directive only specifies the structure of the article, and its display is specified by the style sheet. The above example can become like this:

<H2>使用CSS</H2>

The obedient style sheet can specify that the H2 directive uses italics. Words, red words and white background:

H2 { color: red; background: white; font-style: italic; }

This way the display and content are separated (due to the advantages of CSS, the W3C is now considering abandoning many display instructions in HTML). HTML only expresses the structure of the article, and CSS expresses all display. CSS can dictate color, font style, arrangement, size, and many other non-visual expressions, such as reading the contents of a document.

CSS style information can be included in an attachment or within an HTML file. The reader can use multiple style sheets and in case of duplication he can select one of them. Different media can use different style sheets. For example, the display of a document on a fluorescent screen can be different from the display printed on a printer. This allows authors to design the best display for different media. Additionally, one of the goals of CSS is to give readers greater freedom of control over display. If a reader finds italicized titles difficult to read, he can use his own style sheet file, which can be "cascaded" and change only the red italicized style while retaining all other styles.

Recommended study: "css video tutorial"

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