• a network is a structure in which infomation and services are shared among devices known as nodes or hosts


• a client-server network allows clients to access information provided by one or more servers.
  
  For example, you used a client-side browser to access the html documents of this lecture from a server hosted by amazon somewhere in the world.

picture of Tim Berners proposal concening the management of general information about accelerators and experiments at CERN. It discusses the problems of loss of information about complex evolving systems and derives a solution based on a distributed hypertext system

multiple clients can connect to server(s) - this is what makes up the internet.
The largest WAN in existence is the Internet.

• a network confined to a small geographic area, such as within a building or department, is referred to as a local area network or LAN


• a network that covers a wider area, such as serveral buildings or cities is called a wide area network or WAN

He did not invent the internet, but gave provided context and usability for the Internet. The fact that the Internet and the World Wide Web are synonymous is many users' minds is a testament to the success of the hypertext approach.

• in 1989, Timonthy Berners-Lee and other researches needed an information system that would make it easy to locate and share data on the CERN network.
  
  The solution: develop a system of hypertext documents.


• Hypertext is a method of organization in which data sources are interconnected through a series of links or hyperlinks

• No single organization defined the rules or syntax of HTML, which led to problems as different browser supported different flavors of HTML.


• The World Wide Web Consortium(W3C) was born. The W3C is an international community where Member organizations, a full-time staff, and the public work together to develop Web standards. Led by Web inventor and Director Tim Berners-Lee and CEO Jeffrey Jaffe, W3C's mission is to lead the Web to its full potential.

An HTML tag includes an opening bracket (<), an element name such as h1, and a closing bracket.
The end tag has a slash ( / ) preceding the element.

• Some HTML elements contain only a single tag. These are known as void elements
• Commonly used empty/void elements include:
• <img src="face.jpg" alt="Happy Face" >
• <link href="css/style.css" type="text/css" rel="stylesheet" >
• <br>
• <meta charset="UTF-8">

							
								<h1 id="honorable"> Those who speak truth  </h1>
							
						

• Every HTML element is a member of one or more content categories, with group elements that share characteristics.


• MDN web docs documentation on content categories

• The HTML5 elements for page layout include:
• <header> - Contains the page header content
• <nav> - Contains the navigation elements for the page
• <article> - Contains the primary page content
• <section> - Defines sections or groupings of page content
• <aside> - Contains additional content such as a quote or sidebar
• <figure> - Contains images for the article content
• <footer> - Contains page footer content

• Valid code conforms to W3C rules.


• Valid code enhances browser compatibility, accessibility, and exchange of data
• The most common mistakes include:
• No doctype declaration
• Missing closing tags
• Missing alt attributes in image elements
• Incorrect tag nesting
• Unquoted attributes
• W3C Validation Service Link