The concept of 01 CSS
** CSS: Cascading Style Sheet Cascading Style Sheets **
Uses: performance style HTML file, set fonts, colors, margins, height, width, background images, page positioning settings.
02 CSS development history
- Born in 1996 CSS1.0
- In 1998 CSS2.0 released into the DIV + CSSde concept, put forward separate domains HTML CSS style sheets
- In 2004 CSS2.1 released into the more advanced usage on the basis of CSS2.0, such as floating, positioning
- 2010 CSS3.0 released, is currently the latest version of its trend towards modular, adding a lot of new technologies used, such as fonts, multiple backgrounds, rounded corners, shadows, animation and other advanced properties, but it requires high-level view device support
03 CSS advantage
- Separation of content and presentation
- Web page performance unified, easy to modify
- Rich style, making more flexible page layout
- Reducing the amount of code pages, increase Web browsing speed, save network bandwidth
- Independent of the use of web pages, CSS, conducive pages indexed by search engines
04 basic grammar
- grammar
Selector {
Attribute 1: Property Value; // declare 1
Attribute 2: Property Value; // declaration 2
}
after the last injection CSS // declaration of ";" can not write to write, however, considered based on the W3C standards, proposed closure of the last statement should write ";"
- Style tags
- Location: in and between
- Role: CSS code in the style tag declaration
operation result
