CSS Introduction

What is CSS?

  • CSS stands for Cascading Style Sheets
  • CSS describes how HTML elements are to be displayed on screen, paper, or in other media
  • CSS saves a lot of work. It can control the layout of multiple Web pages all at once
  • External Style Sheets are stored in CSS files

CSS Demo - One HTML Page - Multiple Styles!

Here we will show one HTML page displayed with four different style sheets. Click on the "Stylesheet 1", "Stylesheet 2", "Stylesheet 3", "Stylesheet 4" links below to see the different styles:

Why Use CSS?

CSS is used to define styles for your web pages, including the design, layout and variations in display for different devices and screen sizes. 

CSS Solved a Big Problem

HTML was NEVER intended to contain tags for formatting a web page. HTML was created to describe the content of a web page, 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. CSS was created to specify the document's style, not its content.

In HTML 4.0, and later, all formatting should be removed from the HTML page, and stored in separate CSS files.

CSS Saves a Lot of Work!

The style definitions are normally saved in external .css files.

With an external style sheet file, you can change the look of an entire Web site by changing just one file!