Cascading Style Sheets (CSS) are a way to separate the presentation from the structure of a web site.
HTML was intended as just a structural markup language and doesnt do a good job with the style of the page.
The purpose of a CSS is to provide Web developers with a standard way to define apply and manage sets of style characteristics.
3 How do they work
All you do is write a style the way you want something on your page to look in the style section of the Head. Give it a name then using or surround the text in your body that you want to be that style.
The cascading in Cascading Style Sheets refers to how property values are applied in the context of the parent/child hierarchy of the Web document.
Child elements either inherit or override property values bound to their parent elements
5 Style Sheet
A style sheet is the encapsulation of style rules in a centralized location either in the head section of the HTML document or in a separate linked file. The Web browser reads these styles and applies the specified formatting rules before displaying the content.
6 Style Property
If a value for a style property has not been specified for a child element but has been specified for its parent element then the parents value is used to display the element
if the child element does specify a new value for a style property also specified by the parent the browser uses the childs value to display the element.
In the absence of any other instructions the browser will display all textual elements using the Verdana font.
8 Separating Style from Content
What does CSS offer over pure HTML that would compensate for the additional complexity of using both
The primary benefit is the separation of style and content
Does add some enhanced formatting and positioning features
9 Separating Style from Content
Empowers developers to create use and maintain standardized presentation rules without touching the content
Separating style from content also makes code maintenance and reuse easier
Can easily apply standard professionally developed styles to newly published content
No need for markup or formatting languages
10 CSS Standards and Versions
While the major browser vendorsMicrosoft and Netscapeeach offer implementations of CSS in their Web browser software early implementations of CSS by these browsers have been generally incomplete incompatible with one another and buggy.
W3C released the recommendation for CSS Level 1
describes the foundation of the CSS language and syntax and includes basic formatting functionality
11 CSS Standards and Versions
The current W3C standard is the recommendation for CSS Level 2
CSS2 builds upon CSS1 adding support for style sheets that target particular mediums (such as printers) downloadable fonts positioning and tables
CSS3 is currently under development by the W3C and attempts to formalize these extensions in a standard that captures common industry practice.
12 Future Trends
Contribute 3 is a significant evolution of the product delivering substantial performance improvements support for current Web-design techniques such as layouts based on Cascading Style Sheets (CSS)
straightforward Web-page editor designed for maintaining existing Web sites
13 Future Trends
It enables users who dont necessarily build Web sites-administrative assistants instructors or marketing teams-to edit pages and add pages to an existing Web site without any assistance from the Webmaster
Offers Better Performance
Contribute 3 retrieves and publishes pages significantly faster by caching many of the files that Contribute 2 transferred via FTP
Cost is 50 more then Contribute 2
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