Website Design and Construction Services and Standards

The Internet

Internet Protocol (IP)

Transmission Control Protocol (TCP)

Client – Server model “Server” – because it provides a service. “Client” – because they take advantage of the service.

Hyper-Text Transfer Protocol (HTTP) HTTP protocol shared between two applications.

Uniform Resource Locator Describes –The protocol used. –Type of service requested. –The domain name (IP address). –Location (on the host) of the document. –Name of the document (message). ftp://ftpservername.hct.ac.ae/myfiles/plan.doc

Services (and their provider) Web content (web Server) File transfer (ftp Server) Chat (irc Server) (smtp and pop server) Applications (database servers)

Web Servers and Web Browsers

Web Servers & Web Browsers Many devices = Many browsers –Internet Explorer –Netscape Navigator –Mozilla FireFox –Opera –Lynx –Konqueror

Web Servers & Web Browsers Many browser = problems –Differing interpretations of html pages –Browser specific tags! –Different fonts –Different screen resolutions –Different colour depths

Web Servers & Web Browsers Problems solved by STANDARDS –Language standards (HTML) –Protocol standards –Colour representation standards –…. Standard USE of LANGUAGES

Example

…without images displayed.

HTML

What is the current standard? What percentage of sites conform to the standard? Do all browsers correctly implement the standard?

What is the World Wide Web Consortium (W3C)? Founded in 1994 by Tim Berners-Lee Independent body Define standards Design new technologies