What is CSS?
Css (Cascading Style Sheet) was first developed in 1997 as away for web developers to define the look and feel of their web pages.It was intended to allow developers to separate content from design so thatHtml could perform more of the function that it was originally based on the markup of content,without worry about the design and layout.
Css did'nt gain in popularity until around 2000,when web browsers began using more than the basic and color aspects of Css.And now,all modern browser support all of Css level1,most of Css level2 and some aspects of Css level3.
Web designers that don't use Css for their design and development of web sites are rapidly becoming a thing of the past.And it is arguably as important to understand Css as it is to know Html,and some would say it was more important to know Css.

Css is an abbreviation.Is stands for Cascading Style Sheet.
Style sheet refers to the document itself.Style sheet that have been used for document design for years.They are the technical specifications for a layout,whether print or online.Print designers use style sheets to insure that their designs are printed exactly to specifications.A style sheet for a web page server the same purpose,but with the added functionality of also telling the viewing engine (the web browser) how to render the document being viewed.
Cascade is the special part.A web style sheet is intended to cascade through a series of style sheets,like a river over a waterfall.The water in the river hits all the bocks in the waterfall,but only the ones at the bottom affect exactly where the water will flow.The same is true of the cascade in web style sheet.Every web page is affected by at least one style sheet,when if the web designer doesn't apply any styles.This style sheet is the user agent style sheet,the default styles that the web browser will use to display a page if no instructions are provided.But if the designer provides other instructions,the browser needs to know which instructions have predence.For example;in my web browser the default font is'times new roman',size 6.But early no pages | visit display in that font family and size.This is because the cascade defines the second style sheets set by the designers to redefine the font size and family,and override my web browsers defaults.

Where is Css used?
Css is used to style web pages.But there is more to it that than.Css is used to style Xhtml and Xml markup.This means that anywhere you have xml markup (including Xhtml) you can use Css to define how it will look.Css is also used to define how web pages should look when viewed in other media than a web browser.For example;you can create a print style sheet that will define how the web page show and print out and another style sheet to display the web pages on a projector for a slide show.

Why is Css important?
Css is one of the most powerful tools a web designer can learn because with if you can affect the entire mood and to one of a website.Well written style sheets can be updated quickly and allow sites to change what is prioritized or valued without any change to the underlying Xhtml.The challange of css is that there is so much to learn.But it doesn't seem like it after all,there are only around 60 properties in Css level 1 and around 70 in Css level 2.Compared with the number of Html tags and attributes to learn,than can feel like a cake walk,but because Css can cascade,and combine and browsers,interpret the directives differently.
Css is more difficult than plain Html.But once you start using it,you'll see that harnessing the power of css will give you more options and allow you to do more and more things with your websites.If you want to be a professional web designer,you need to learn Cascading Style Sheet,but luckily they are fun to learn.

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How to use Css?
Here i explain to you a glimpse of it.