CSS Introduction

## CSS Basic

CSS HOME CSS Introduction CSS Syntax CSS Id & Class CSS How To CSS Backgrounds CSS Text CSS Fonts CSS Links CSS Lists CSS Tables

## CSS Box Model

CSS Box Model CSS Border CSS Outline CSS Margin CSS Padding

## CSS Advanced

CSS Grouping/Nesting CSS Dimension CSS Display CSS Positioning CSS Floating CSS Align CSS Pseudo-class CSS Pseudo-element CSS Navigation Bar CSS Image Gallery CSS Image Opacity CSS Image Sprites CSS Media Types CSS Attr Selectors

## CSS3 Tutorial

CSS3 Introduction CSS3 Borders CSS3 Backgrounds CSS3 Gradients CSS3 Text Effects CSS3 Fonts CSS3 2D Transforms CSS3 3D Transforms CSS3 Transitions CSS3 Animations CSS3 Multiple Columns CSS3 User Interface CSS Summary

## CSS Examples

CSS Examples CSS Quiz CSS Certificate

## CSS References

CSS Reference CSS Selectors CSS Reference Aural CSS Web Safe Fonts CSS Units CSS Colors CSS Color Values CSS Color Names CSS Color HEX

# CSS Introduction

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## What You Should Already Know

Before you continue you should have a basic understanding of the following:

- HTML / XHTML

If you want to study these subjects first, find the tutorials on our Home page.

## What is CSS?

- CSS stands for Cascading Style Sheets
- Styles define how to display HTML elements
- Styles were added to HTML 4.0 to solve a problem
- External Style Sheets can save a lot of work
- External Style Sheets are stored in CSS files

## CSS Demo

An HTML document can be displayed with different styles: See how it works

## Styles Solved a Big Problem

HTML was never intended to contain tags for formatting a document.

HTML was intended to define the content of a document, like:

<h1>This is a heading</h1>

<p>This is a paragraph.</p>

When tags like <font>, and color attributes were added to the HTML 3.2 specification, it started a nightmare for web developers. Development of large web sites, where fonts and color information were added to every single page, became a long and expensive process.

To solve this problem, the World Wide Web Consortium (W3C) created CSS.

In HTML 4.0, all formatting could be removed from the HTML document, and stored in a separate CSS file.

All browsers support CSS today.

## CSS Saves a Lot of Work!

CSS defines HOW HTML elements are to be displayed.

Styles are normally saved in external .css files. External style sheets enable you to change the appearance and layout of all the pages in a Web site, just by editing one single file!

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