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Basic Computer Skills

Notes to save time, network bandwidth or merely to simplify their browsing experience. Users
of mobile devices often have restricted displays and bandwidth. Anyone may prefer not
to use the fonts, font sizes, styles and color schemes selected by the web page designer
and may apply their own CSS styling to the page. The World Wide Web Consortium
(W3C) and Web Accessibility Initiative (WAI) recommend that all web pages should be
designed with all of these options in mind.

13.4.1 Elements
A web page, as an information set, can contain numerous types of information, which is able
to be seen, heard or interact by the end user:
Perceived (rendered) information:
Textual information: with diverse render variations.
Non-textual information:
Static images may be raster graphics, typically GIF, JPEG or PNG; or vector
formats such as SVG or Flash.
Animated images typically Animated GIF and SVG, but also may be Flash,
Shockwave, or Java applet.
Audio, typically MP3, ogg or various proprietary formats.
Video, WMV (Windows), RM (Real Media), FLV (Flash Video), MPG, MOV
(QuickTime).
Interactive information
For “on page” interaction:
Interactive text.
Interactive illustrations: ranging from “click to play” images to games, typically
using script orchestration, Flash, Java applets, SVG, or Shockwave.
Buttons: forms providing alternative interface, typically for use with script
orchestration and DHTML.
For “between pages” interaction:
Hyperlinks: standard “change page” reactivity.
Forms: providing more interaction with the server and server-side databases.

Internal (hidden) information:
Comments
Linked Files through Hyperlink (Like DOC,XLS,PDF,etc).
Metadata with semantic meta-information, Charset information, Document Type
Definition (DTD), etc.
Diagramation and style information: information about rendered items (like image
size attributes) and visual specifications, as Cascading Style Sheets (CSS).
Scripts, usually JavaScript, complement interactivity and functionality.
The web page can also contain dynamically adapted information elements, dependent upon
the rendering browser or end-user location (through the use of IP address tracking and/or
“cookie” information).
From a more general/wide point of view, some information (grouped) elements, like a

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