Web Development Css

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  • Topic: HTML, Cascading Style Sheets, Typography
  • Pages : 15 (3319 words )
  • Download(s) : 47
  • Published : January 31, 2013
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CSS
(CASCADING STYLE SHEET)
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
HTML was never intended to contain tags for formatting a document. HTML was intended to define the content of a document, like: This is a heading
This is a paragraph.
When tags like , 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. CSS Syntax

A CSS rule has two main parts: a selector, and one or more declarations:

The selector is normally the HTML element you want to style. Each declaration consists of a property and a value.
The property is the style attribute you want to change. Each property has a value. Example
p {color:red;text-align:center;}
CSS Syntax
A CSS rule has two main parts: a selector, and one or more declarations: The selector is normally the HTML element you want to style. Each declaration consists of a property and a value.
The property is the style attribute you want to change. Each property has a value. CSS Example
CSS declarations always ends with a semicolon, and declaration groups are surrounded by curly brackets: p {color:red;text-align:center;}
To make the CSS more readable, you can put one declaration on each line, like this: Example
p
{
color:red;
text-align:center;
}
Source: http://www.w3schools.com/css/default.asp

Page 1 of 11

CSS Comments
Comments are used to explain your code, and may help you when you edit the source code at a later date. Comments are ignored by browsers.
A CSS comment begins with "/*", and ends with "*/", like this: /*This is a comment*/
p {text-align:center;
color:black;
font-family:arial; }

/*This is another comment*/

The id and class Selectors
In addition to setting a style for a HTML element, CSS allows you to specify your own selectors called "id" and "class".
The id Selector
The id selector is used to specify a style for a single, unique element. The id selector uses the id attribute of the HTML element, and is defined with a "#". The style rule below will be applied to the element with id="para1": #para1 { text-align:center; color:red; }

The class Selector
The class selector is used to specify a style for a group of elements. Unlike the id selector, the class selector is most often used on several elements.
This allows you to set a particular style for any HTML elements with the same class. The class selector uses the HTML class attribute, and is defined with a "." In the example below, all HTML elements with class="center" will be center-aligned: Example

.center {text-align:center;}
You can also specify that only specific HTML elements should be affected by a class. In the example below, all p elements with class="center" will be center-aligned: Example
p.center {text-align:center;}
Do NOT start a class name with a number! This is only supported in Internet Explorer. Three Ways to Insert CSS
There are three ways of inserting a style sheet:
* External style sheet
* Internal style sheet
* Inline style

Source: http://www.w3schools.com/css/default.asp

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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 us ing the tag. The tag goes inside the head section:

An external style sheet can be written in any text editor. The file should not contain any html tags. Your style sheet...
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