Understanding Browsers, HTML Page Structure, Defining Web Layout

Browser

 web browser (commonly referred to as a browser) is a software application for retrieving, presenting and traversing information resources on the World Wide Web. An information resource is identified by a Uniform Resource Identifier (URI/URL) and may be a web page, image, video or other piece of content. Hyperlinks present in resources enable users easily to navigate their browsers to related resources.

Although browsers are primarily intended to use the World Wide Web, they can also be used to access information provided by web servers in private networks or files in file systems.

The major web browsers are Google Chrome, Mozilla Firefox, Internet Explorer, Opera, and Safari

 Introduction to the structure of an HTML document


An HTML 4 document is composed of three parts:
  1.     a line containing HTML version information,
  2.     a declarative header section (delimited by the HEAD element),
  3.     a body, which contains the document's actual content. The body may be implemented by the BODY element or the FRAMESET element.

White space (spaces, newlines, tabs, and comments) may appear before or after each section. Sections 2 and 3 should be delimited by the HTML element.

Here's an example of a simple HTML document:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
   "http://www.w3.org/TR/html4/strict.dtd">
<HTML>
   <HEAD>
      <TITLE>My first HTML document</TITLE>
   </HEAD>
   <BODY>
      <P>Hello world!
   </BODY>
</HTML>
Defining Web Layout
Page layout refers to the arrangement of text, images, and other objects on a page. The term was initially used in desktop publishing (DTP), but is now commonly used to describe the layout of webpages as well. Page layout techniques are used to customize the appearance of magazines, newspapers, books, websites, and other types of publications.

The page layout of a printed or electronic document encompasses all elements of the page. This includes the page margins, text blocks, images, object padding, and any grids or templates used to define positions of objects on the page. Page layout applications, such as Adobe InDesign and QuarkXpress, allow page designers to modify all of these elements for a printed publication. Web development programs, such as Adobe Dreamweaver and Microsoft Expression Studio allow Web developers to create similar page layouts designed specifically for the Web.
Since there are many applications that create customized page layouts, there is also a specific file format category for page layout file types. These files are similar to word processing documents, but may contain additional page formatting information and other types of visual content.
 
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