The Evolution of the Web Page
The Web was originally intended to help researchers share documents as static pages of linked text formatted in HTML. From there, Web pages quickly evolved to include complex structures of text and graphics, with plug-in programs to play audio and video files or to stream multimedia content.
Web developers supplement the basic browser function of rendering HTML by invoking code (scripts) on the user’s computer (the client).
These scripts can create interface elements such as rollover effects, custom pull-down menus, and other navigation aids. They can also execute UI methods, for example, to validate a user’s input in an HTML form. These script capabilities, while they enhance a user’s interaction with individual Web pages, do not change the fundamental model in which application logic runs on the server and executes between Web pages after the user clicks. This behavior is said to be synchronous, that is, after each click the user waits while the server handles the input and the browser downloads a response page.
In e-commerce, a typical user interaction involves a series of Web pages, which represent steps in a larger process that comprise a Web application
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