DHTML

What is DHTML. Differentiate the external, internal and inner style sheets with one example each.

Dynamic HTML, or DHTML, is an umbrella term for a collection of
technologies used together to create interactive and animated websites
by using a combination of a static markup language (such as HTML), a
client-side scripting language (such as JavaScript), a presentation
definition language (such as CSS), and the Document Object Model (DOM).
The application of DHTML was introduced by Microsoft with the release of
Internet Explorer 4 in 1997. DHTML allows scripting languages to change
variables in a web page’s definition language, which in turn affects
the look and function of otherwise “static” HTML page content, after the
page has been fully loaded and during the viewing process. Thus the
dynamic characteristic of DHTML is the way it functions while a page is
viewed, not in its ability to generate a unique page with each page
load. By contrast, a dynamic web page is a broader concept, covering any
web page generated differently for each user, load occurrence, or
specific variable values. This includes pages created by client-side
scripting, and ones created by server-side scripting (such as PHP, Perl,
JSP or ASP.NET) where the web server generates content before sending
it to the client. DHTML is differentiated from Ajax by the fact that a
DHTML page is still request/reload-based. With DHTML, there may not be
any interaction between the client and server after the page is loaded;
all processing happens in JavaScript on the client side. By contrast, an
Ajax page uses features of DHTML to initiate a request (or
‘subrequest’) to the server to perform additional actions. For example,
if there are multiple tabs on a page, pure DHTML approach would load the
contents of all tabs and then dynamically display only the one that is
active, while AJAX could load each tab only when it is really needed.

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