HTML Styles - CSS

How to Use Styles

When a browser reads a style sheet, it will format the document according to it. There are three ways of inserting a style sheet:

External Style Sheet

An external style sheet is ideal when the style is applied to many pages. With an external style sheet, you can change the look of an entire Web site by changing one file. Each page must link to the style sheet using the <link> tag. The <link> tag goes inside the head section.

<head>
<link rel="stylesheet" type="text/css"
href="mystyle.css">
</head>

Internal Style Sheet

An internal style sheet should be used when a single document has a unique style. You define internal styles in the head section with the <style> tag.

<head>
<style type="text/css">
body {background-color: red}
p {margin-left: 20px}
</style>
</head>

Inline Styles

An inline style should be used when a unique style is to be applied to a single occurrence of an element.

To use inline styles you use the style attribute in the relevant tag. The style attribute can contain any CSS property. The example shows how to change the color and the left margin of a paragraph:

<p style="color: red; margin-left: 20px">
This is a paragraph
</p>

Style Tags:

NN: Netscape, IE: Internet Explorer, W3C: Web Standard

Start Tag NN IE W3C Purpose
<style> 4.0 3.0 3.2  Defines a style in a document
<link> 4.0 3.0 3.2 Defines the relationship between two linked documents
<div> 3.0 3.0 3.2  Defines a division/section in a document
<span> 4.0 3.0 4.0  Defines a section in a document
<font>       Deprecated. Use styles instead
<basefont>       Deprecated. Use styles instead 
<center>       Deprecated. Use styles instead