HyperText Markup Language

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categorie: Informatica

nota: 10.00

nivel: Facultate

HTML is not a word processing tool, a desktop publishing solution, or even a programming language, for that matter. HTML's fundamental purpose is to define the structure and appearance of documents and document families so that they might be delivered quickly and easily to a user over a network for rendering on a variety of display devices.
HTML is designed to structure documents and make [...]
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HTML is not a word processing tool, a desktop publishing solution, or even a programming language, for that matter. HTML's fundamental purpose is to define the structure and appearance of documents and document families so that they might be delivered quickly and easily to a user over a network for rendering on a variety of display devices.
HTML is designed to structure documents and make their content more accessible, not to format documents for display purposes.

HTML does provide many different ways to allow the definition of the appearance of the documents: font specifications, line breaks, and preformatted text are all features of HTML. But with HTML appearance is secondary, particularly since it is less predictable given the variety of browser graphics and text-formatting capabilities (different browsers may render the same document differently).
HTML is an embedded language: the language's directions (or tags) are inserted into the same document that clients load into a browser for viewing. HTML document tags are simple to understand and use since they are made up of common words, abbreviations, and notations.

For instance, the and tags tell the browser to respectively start and stop italicizing the text characters that come between them.
The HTML standard and its various extensions define how and where to place tags within a document. Every HTML tag consists of a tag name, sometimes followed by an optional list of tag attributes, all placed between opening and closing brackets (< and >). The simplest tag is nothing more than a name appropriately enclosed in brackets, such as and . More complicated tags have attributes, which may have specific values that are defined by the document author; others modify the behaviour of the tag.

Tag attributes belong after the tag name, each separated by one or more tab, space, or return character. The order of attributes in a single tag is not important.
Tag and attribute names are not case sensitive. There's no difference in effect between , , , or even ; they are all equivalent. The values that are assigned to a particular attribute may be case sensitive, however, depending on the browser and server. In particular, file location and name references--universal resource locators (URLs)--are case sensitive.
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