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Published byCitlali Maycroft Modified over 9 years ago
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A Basic Introduction to the WWW and HTML How the World Wide Web Works
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What is the WWW ? It’s a service available through the Internet which allows the transmission and rendering of multimedia documents It uses a special protocol named HTTP (HyperText Transfer Protocol) It uses a set of network addresses named URL (Uniform Resource Locator)
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What is a protocol ? It is a convention or language which allows the communication between any two computers through a network The main protocol used by Internet is TCP/IP (Transfer Control Protocol/Internet Protocol) There are many other protocols running under TCP/IP. Examples: –SMTP: Simple Mail Transfer Protocol –FTP: File Transfer Protocol
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Uniform Resource Locator http://www.nlm.nih.gov/visible/sample.htm ProtocolHost DirectoryFile Address format for the WWW:
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WWW: Client and Server Client Computer which is asking for an archive on the net Server Computer which sends the desired archive I Internet
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Client software: Netscape, Internet Explorer (browser) Server software: WWW Server HTTP WWW: Client and Server Client Server I Internet
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WWW: Client and Server Cliente Server www.nlm.nih.gov Server www.nlm.nih.gov I Internet Client software: Netscape, Internet Explorer Server software: WWW Server HTTP http://www.nih.nlm.gov/visible/sample.htm Finding Connecting Retrieving
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WWW: Client and Server Client Server www.nlm.nih.gov Server www.nlm.nih.gov I Internet Client software: Netscape, Internet Explorer Server software: WWW Server HTTP Http://www.nih.nlm.gov/visible/sample.htm Confirmation Transference Closing sample.htm logo.gif return.gif
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How the Client Works Client Client software browser Http://www.nih.nlm.gov/visible/sample.htm sample.htm logo.gif return.gif The Visible Human Project National Library of Medicine The Visible Human Project National Library of Medicine Script in HTML Rendering by the browser
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The Visible Human Project National Library of Medicine Amostras WHO The Visible Human Project National Library of Medicine Amostras WHO What is Hypertext Visible Human: Amostras Nesta página você poderá achar algumas amostras de imagens geradas pelo Projeto “Ser Humano Visível” em três dimensões. Visible Human: Amostras Nesta página você poderá achar algumas amostras de imagens geradas pelo Projeto “Ser Humano Visível” em três dimensões. amostra.htm imagem.htm
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What is HTML ? It’s a language for the specification of documents (mark-up language) It specifies for the browser what are the elements of a page (text, images, etc.) and where and how they should be rendered A text file.HTM contains embedded mark-up commands and tags, enclosed by The browser interprets these tags and commands and renders the page
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Elements of HTML Tags for document definition: title, head, body, etc. Tags for text definition: paragraphs, color, size, font, emphasis, etc. Tags for placing images Tags for defining hyperlinks Tags for defining tables, forms, frames, etc.
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