css| Tutorial | style sheet CSS (cascading style sheets, cascading style sheet) is a new technology for making Web pages that is now supported by most browsers and is one of the essential tools for Web design. The use of CSS can simplify the format of the page code, speed up the download display, but also reduce the number of code to upload, especially in the face of the designer's hundreds of web site, greatly reducing the workload of duplication of work.
The World Wide Web Consortium The Dynamic HTML into three parts: scripting languages (including JavaScript, VBScript, and so on), browsers that support dynamic effects, including the Internet Explorer, Netscape Navigator, and so on) and CSS style sheets.
Features of cascading style sheets
In the past, the lack of dynamic Web pages, the layout of the content of the page also has a lot of difficulties, if not professionals or particularly patient people, it is difficult to let the Web page according to their own ideas and ideas to display information. Even those who have mastered the essence of the HTML language will have to pass many tests to master the layout of the information, the process is very long and painful. For the development of the Internet, let more people set foot in this colorful world as soon as possible, new HTML auxiliary tool is ready to be ready.
The style sheet is born under this kind of demand, the first thing to do is to precisely position the elements on the Web page, so that web designers like the director, easy to control by the text, the image of the actors, in the Web site on the stage according to the script requirements to perform well.
Second, it separates the content structure and format control on the Web page. The viewer wants to see the content structure on the Web page, and in order for the viewer to see this information better, it is necessary to help by formatting control. The previous two on the Web page distribution is staggered, see the modification is inconvenient, and now the two separate will greatly facilitate the designer of the Web page. The separation of the content structure from the format control allows the Web page to be composed of content, while the formatting of all pages is controlled to a CSS style sheet file. This benefits in two ways: first, simplifying the format of the Web page, the external style sheet will be saved in the browser cache, speed up the download display speed, but also reduce the number of code to upload (because the format of the duplicate settings will be saved only once). Second, as long as the changes to preserve the Web site format CSS style sheet files can change the style of the entire site, in the number of pages to modify the huge site, it is particularly useful. Avoid a Web page modification, greatly reducing the workload of duplication of work, when you are facing a site with hundreds of pages, CSS is like God's gift to us!
Visible from the above, the use of CSS must have the basic knowledge of HTML, at least able to write or be able to read basic HTML language. This is also the necessary basis for learning the following courses.
