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What is CSS?




CSS or Cascading Style Sheets consist of rules that modify how HTML is displayed on a web page. CSS can effect the design and layout of a web page based upon the media it is viewed on.


CSS - Cascading Style Sheets

CSS utilizes rules to provide a web page with design and layout information. The rules provided in the CSS document can be applied to different types of media including desktop display, mobile viewing or printed material. CSS is added to a web page along with HTML and applied when a browser displays the web page to a user. CSS rules utilize inheritance to apply rules to many elements or specific sub elements within a given element.

CSS Design Rules

The design of a web page or entire website can be controlled by one or more CSS documents. Rules can be applied to HTML elements with a class or element ID. By referencing the HTML element, rules for formatting, including color, size and spacing can be applied. Examples of design rules include display information for headers, paragraphs and images. Padding and margin can be applied to elements to provide spacing between web page elements. Formatting rules can change the way that text, links and headings are colored, sized or rendered.

CSS Layout Rules

CSS can also provide information on how a web page or website layout. Layout rules detail position and order of HTML elements. Common layout rules for position include absolute, relative and fixed. By combining layout rules, a web page layout can be made to adapt to any screen size. This type of design is called a liquid design.

CSS Media Queries

Media rules or media queries can tell a web page how to change the way it is displayed based on the device it is viewed on. Desktop display may include rules for large screens and mouse based interactions. Mobile CSS rules often modify the design and layout of HTML elements on to fit a smaller screen and provide better interaction with touch devices. Additional media rules can be provided for printable web pages. Print rules may hide or show specific elements to provide users with a printable format. CSS can include many media queries with different design and layout rules to provide the best experience regardless of display.

CSS is...

CSS provides a set of rules to a web page or website to define the design and layout of HTML elements. Media elements provide a way to change the design and layout of the web page to the device it is displayed on. JavaScript can be combined with CSS to provide interactive changes in the web pages design and layout. CSS is a powerful tool for web design.

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Bryan Myers - "The Web Guy"

Advanced Digital Channel Engineer


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