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Dynamic HTML #1

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أستاذ المادة حيدر محمد حبيب الخميس       02/10/2012 18:28:51
The Internet
The Internet is simply a catchall phrase referring to the vast, globe-spanning network of computers that are connected to each other and are able to transmit and receive data, shuttling information back and forth around the world at nearly the speed of light. It has been around in some form for almost half a century now, ever since a few very smart people figured out how to make one computer talk to another computer. The Internet has since become so ubiquitous and pervasive, impacting so many aspects of modern life, that it’s hard to imagine a world without it.

The World Wide Web
The World Wide Web is just one facet of the Internet, like a bustling neighborhood in a much larger city. It’s made up of millions of files and documents residing on different computers across the Internet, all cross-referenced and interconnected to weave a web of information around the world, which is how it gets its name. In its relatively short history, the web has grown and evolved far beyond the simple text documents it began with, carrying other types of information through the same channels: images, video, audio, and fully immersive interactive experiences. But at its core, the web is fundamentally a text-based medium, and that text is usually encoded in HTML.
Many different devices can access the web: desktop and laptop computers, personal digital assistants (PDAs), mobile phones, game consoles, and even some household appliances. Whatever the device, it in turn operates software that has been programmed to interpret HTML. These programs are technically known as user-agents, but the more familiar term is web browsers.

The Web Browser
A web browser is specifically a program intended to visually render web documents, whereas some user-agents interpret HTML but don’t display it.
A browser or user-agent is also known as a client, because it is the thing requesting and receiving service. The computer that serves data to the client is, not surprisingly, known as a server. The Internet is riddled with servers, all storing and processing data and delivering it in response to client requests. The client and the server are two ends of the chain, connected to each other through the Internet.

The Effect of Browser Wars
Browser incompatibility is the main cause for the necessity to have different methods to access layers. When Netscape Navigator 4 was introduced, it was the first "DHTML browser." Unfortunately, it was released before the World Wide Web Consortium could issue recommended standards for the DOM.
Previous problems with coding DHTML technologies occurred because the browser manufacturers created their own non-standardized, proprietary features specific to the use of that particular browser. This has resulted in Web pages that look fine on one browser, but not with other browsers. Microsoft Internet Explorer 4, though not perfect used a more advanced DOM where every HTML element is programmable. Since then, we have seen the introduction of W3C standards, Internet Explorer 5 and 6, Netscape 6 and 7, and Firefox. DHTML has become a much more powerful tool and, more importantly, a standard.


المادة المعروضة اعلاه هي مدخل الى المحاضرة المرفوعة بواسطة استاذ(ة) المادة . وقد تبدو لك غير متكاملة . حيث يضع استاذ المادة في بعض الاحيان فقط الجزء الاول من المحاضرة من اجل الاطلاع على ما ستقوم بتحميله لاحقا . في نظام التعليم الالكتروني نوفر هذه الخدمة لكي نبقيك على اطلاع حول محتوى الملف الذي ستقوم بتحميله .
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