applications running on a Internet-connected computer
	receive a message over the Internet (or over the loopback interface).
	find the file specified in the message
	send the file to the application that sent the message

	send messages to servers 
		typed by a user into the url box

	files that are stored under a document root at a server site
	written in HTML
	can specify text formats, images to display, scripts to run

	A Web Server can interpret and run a script by submitting it to a special module (e.g. PHP)

	A mark-up language for Web pages

	Current standard

	Put text, pictures, and links on a page (all are elements)
		Text: just type it
		Pictures: "img" element
		Links: "a" element (for anchor)
	Get user input
		Form element

	Tags surround elements
	Tags indicate the type of element

	DOCTYPE element
	Head
	Body
	Headers and paragraphs
	script tags and php tags
		Look at the source for a php page
		 (i.e., look at the file sent by the Browser)

	Must create a plain text file
	Creating a page with nano
	Creating a page with TextEdit
	Creating a page with gedit

	Headers <h1>, … <h6>
		apply styles for headers
		organize page
	Paragraphs <p>
		Separate text
	Links <a href="...">
		Link to another page
	Images <img src="...">
		Include an image

	Start tag
	End tag
	Element
	Can be empty - can close empty element in start tag
	Elements can have attributes
	Elements can be nested - e.g., an image as a link

	Specifed as name/value pair in start tag
	Examples:
		href in "a" tag
		src in "img" tag
	Values must be quoted in name/value pair

	Search engines use headers
	Users rely on headers
	Also:
		hr - horizontal line
		<!-- --> comments

	Browsers ignore white space

	bold
	italic
	computer output
	block quotes and quotes

	How a link acts
	Structure of element definition
		target attribute
		id attribute

	Title
	Base
	Link
	Style
	Meta
	Script

	Define style
		Inline - for an element
		In head - for a page
		Externally - for a Web Site

	Tag syntax
	Location of image files

	Tags
		table - identifies table element
			border attribute
		tr - identifies row, 
		td - identifies column (element inside row)

	ul - unordered list element
	ol - ordered list element
	li - list item

	Div and span

	form
		action attribute
		method attribute  (come back to this after reading Chapter 1)
			get
			post
	input
		type attribute
			text, checkbox, password, radio, submit
		name attribute
	select