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css introduction

What is CSS?
•Stands for Cascading Style Sheet
•CSS allows you to style HTML elements, or define how they are displayed.
•Styles are normally stored in Style Sheets
•External Style Sheetscan save you a lot of work
•External Style Sheets are stored in CSS files
•Multiple style definitions will cascadeinto one
•Examples:
–Changing the color of text
–Specifying the size and position of a div

What is CSS? (cont.)
•CSS is an alternative to the “style” attribute.
–<div style=“height:500px; width:200px”></div>
•Advantages:
–Can control the style of many different elements with a single command.
–Separation of function: HTML can focus on content while CSS handles styling.


CSS (Cascading Style Sheet)
•Simple mechanism for adding style to web page
•Code be embedded into the HTML file
•HTML tag:
<style type=“text/css”>CODE</style>
•Also be in a separate file FILENAME.css
•HTML tag:
<link rel=“stylesheet” href=“scs.css” type=“text/css”>
•Style types mainly include:
•Font
•Color
•Spacing

Style Attribute
•Allows you to control the style of HTML elements.
•Redundant with CSS. “quick and dirty” styling.
•E.g.
<h1 style="color:blue; text-align:center">This is a header</h1>
<p style="color:green">This is a paragraph.</p>
•The name-value pairs in the style definition are actually CSS property/value pairs.

The style is defined in the head section of the document, similar to the following:
<head><style type =“text/css”>
p.heading{ font-weight : bold; text-decoration : underline; }
</style>
</head>
This definition defines a heading class that formats text as bold and underlined.
Styles and HTML

Selectors and Properties

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