 cascade Style Sheets (CSS) is a mark-up language that was first proposed in 1994 by Håkon Wium Lie. CSS works in conjunction with HTML to greatly increase the ability of Web designers to control the appearance of Web pages. Håkon Wium Lie  The style sheet is a set of Cascading Style Sheets (CSS) rules that tell the browser how to display the page

 You will be able to position HTML elements, images, and objects exactly where you want them on the page by using CSS rules or rules of CSS which is positioning with style sheets. HTML describes the structure of the document and CSS controls the appearance of the Web page.

 The HTML document is what you code and the Web page is what you see. . When you use CSS rules inside an HTML document, be aware that the various browsers do NOT display the Web page similarly and be sure to test your pages in more that one browser before uploading your pages to the Web server.

 Instead of coding all of the attributes and values of the HTML elements into the web document you will now place one rule for each attribute and value one time into one place -- the style sheet.  You no longer have to use the Blue Title each time you need for specify a font change.

 All of the CSS mark-up coding for an "internal style sheet" occurs between the and tags in the HEAD section of the HTML document  line style: occurs inside HTML tags in the body section of the HTML document. An "external style sheet" is linked to, from within the HEAD section of the HTML document.

 CSS is easy to write and easier than HTML to learn since the selectors of CSS rules already use the names of HTML "tags".  You just mark-up the structures in HTML and let Cascading Style Sheets take care of the appearance.  you will find also makes for smaller size documents that load faster.

 Site maintenance time is cut because you just change the style sheet in one place one time instead of having to hand code a change on every page

 Style rule: a rule that defines the style of the document

 Pseudo class: used in style sheet selector but not in HTML, it allow external information to influence the formatting process.  Simple selectors: defines an element irrespective of its positioning in the document structure.  HTMAL selector : it used the name of HTML element without a bracket.  Class selector : these selector us attribute of HTML element, every element visible has attribute, which is used to assign an adentifier

 ID selector: use the ID attribute of an HTML element. Is also used to apple style to individual element on a web page  Contextual selector: it refers to the context of element

 STYLE element  STYLE attributes  LINK element