There are many commercial browsers that interpret and display a web document. Almost all of them use the same architecture. The browser is usually is made of three parts: controller, client programs, and interpreters. The controller gets input from the keyboard or the mouse and uses the client program to access the document.
After the document has been accessed, the controller uses one of the interpreters to display the document on the screen. The client program can be one of the methods such as HTTP, FTP, Gopher or Telnet. The interpreter can be HTML, CGI, or JAVA, depending on the type of document. Documents in the World Wide Web can be grouped into three broad categories. The category is based on the time when contents of the document are determined.
Static documents are fixed-content documents that are created and stored in a server. The client can only get a copy of it, the contents of the file are determined when it is created and not when it is used. Of course, the documents can be changed in the server, but the user cannot change it. When a client accesses the document, a copy of the document is sent. The user can then use a browsing program to display the document.
Hypertext markup language is a mark up language for writing web pages. It is called a markup language because the only thing it does is let the browsers format the WebPages. The idea came from the book publishing industry. Before a book goes for its final printing, a copy editor reads the manuscript and puts a lot of marks on it. These marks tell the designer how to format the text. In HTML, to make a part of the text to be displayed bold face, we must include the beginning and ending boldface markup tag in the text.
The two marks and are instructions for the browser. When the browser sees these two marks, it knows that the text must be boldface. A markup language like HTML allows us to embed formatting instructions in the file itself. The instructions are stored with the text. In this way, any browser can read the file itself.
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The instructions are stored with the text. In this way, any browser can read the instructions and format the text according to the workstation being used. HTML has changed the concept of E commerce.
