HyperText Markup Language (HTML) is a predominant markup language for the creation of web pages. It provides a means to describe the structure of text-based information in a document — by denoting certain text as headings, paragraphs, lists, and so on — and to supplement that text with interactive forms, embedded images, and other objects. HTML can also describe, to some degree, the appearance and semantics of a document, and can provide additional cues, such as embedded scripting language code, that can affect the behavior of web browsers and other HTML processors.
HTML is defined in formal specifications that were developed and published throughout the 1990s, inspired by Tim Berners-Lee's prior proposals to graft hypertext capability onto a homegrown SGML-like markup language for the Internet. The first published specification for a language called HTML was drafted by Berners-Lee with Dan Connolly, and was published in 1993 by the IETF as a formal "application" of SGML (with an SGML Document Type Definition defining the grammar).
HTML markup consists of several types of entities, including: elements, attributes, data types and character references.
Dynamic HTML or DHTML is a term used for a collection of technologies, used together to create interactive and animated web sites by using a combination of static markup language (such as HTML), a client-side scripting language (such as JavaScript), the presentation definition language (e.g. Cascading Style Sheets [CSS]), and the Document Object Model. The term has fallen out of use in recent years, as DHTML scripts often tended to not work well cross platform. Newer techniques, including Ajax and unobtrusive JavaScript coding, have led to similar results, but in an accessible, standards-compliant way.
Some disadvantages of DHTML are that it is difficult to develop and debug due to varying degrees of support among web browsers of the aforementioned technologies and that the variety of screen sizes means the end look can only be fine-tuned on a limited number of browser and screen-size combinations. Development for recent browsers, such as Internet Explorer 5.0+, Netscape 6.0+, and Opera 7.0+, is aided by a shared Document Object Model.
Dynamic HTML is also often used to make rollover or drop-down buttons on a web page. DHTML is a combination of JavaScript, CSS, HTML, and sometimes Ajax.
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