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Published byRoland Hall Modified over 9 years ago
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COP 3813 Intro to Internet Computing Prof. Roy Levow Lecture 1
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World Wide Web (WWW) Created –By Tim Berners-Lee –In 1990 –At CERN, European Org. for Nuclear Research –Developed the web concept
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First Browser Moasic –Developed by team led by Marc Andreesen –In 1993 –At NCSA, National Center for Supercomputer Applications –Later Andreesen developed Netscape browser based on Mosaic
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Many Browsers Microsoft Internet Explorer Netscape (AOL) Mozilla Opera Lynx (text only) …
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World Wide Web Consortium (W3C) Founded in 1994 By Andreesen Sets standards for WWW –Called Recommendations
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Languages for Web Page Development Originally HyperText Markup Language = HTML –Describes content and style but not layout details Now Extensible HTML = XHTML
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Programming within Web Pages Add dynamic elements to web pages Interpreted Script Langauges –JavaScript –VBScript Compiled code –Java Microsoft.NET Framework Dynamic HTML
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Compatability Issues Variety of Technologies New Extensions Not all web pages work with all browsers Developers –Choose a platform –Create different versions for different platforms
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Browsers Obtain web pages and other content over the web Render HTML and extensions Support navigation over links Many additional display and usability
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Uniform Resource Locator (URL) Standard “address” for web content http://www.cse.fau.edu/~roy Format –Service type –Separator –Host domain name:port –Directory and file path –parameters
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Browser Plug-ins Extend functionality of browser Many are available User notified when plug-in is needed Downloaded and stored in designated directory Automatically run when required
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Browser History, etc. History –Retains record of recently visited sites Cache –Contains copies of recently loaded web content Cookies –Small files that are stored by a site and can later be fetched by the same site for tracking
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Other Web Services File transfer –ftp or http Email Instant Messaging
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