"Dynamic HTML" is the combination of HTML, style sheets and scripts that allows documents to be animated, this refers to animating, hiding, showing, stacking, and formatting HTML content on the screen using JavaScript, or Visual Basic Script. Dynamic HTML first became possible within Navigator 4 and Internet Explorer 4 through proprietary features and DOM extensions of each browser.
In Navigator 4+ these features included the LAYER and ILAYER elements, the SRC attribute of the DIV element, and the document.layers[] extension to the DOM.
In Internet Explorer 4+ these features also include
Filters and Transitions-Multimedia style effects using visual filters and transitions to standard HTML controls, such as text, containers, and images:
Alpha, BasicImage, Blend, Blur, Chroma, Compositor, DropShadow, Emboss, Engrave, Glow, Light, MaskFilter, Matrix, MotionBlur, Shadow, and Wave.
Dynamic HTML provides authors with enhanced creative control so they can manipulate any page element at any time, with Total Creative Control for an Immediate User Experience.
Dynamic HTML allows simple updates, and allow every element in the page to become dynamic. Whether the page has loaded already, content providers can change any element of the page -- text, color, or graphics -- without a round-trip to the server.
Dynamic HTML can run on the "client-side" eg. html or htm extensions, or run on the
"server-side" eg. "Active Server Pages (asp), or using Hybrid Technology eg. AJAX, ATLAS.
Key features of Dynamic HTML include these:
Document Object Model (DOM). Dynamic HTML provides a comprehensive object model for HTML. This model exposes all page elements as objects. These objects can easily be manipulated, by changing their attributes or applying methods to them at any time. Dynamic HTML also provides full support for keyboard and mouse events on all page elements.
The Document Object Model is a platform- and language-neutral interface that will allow programs and scripts to dynamically access and update the content, structure and style of documents. The document can be further processed and the results of that processing can be incorporated back into the presented page.
Support for the Document Object Model enables the following:
Dynamic content. Text or graphics can be added, deleted, or modified on the fly.
Dynamic styles. Any CSS (Cascading Style Sheets) attribute, including color and font, can be updated without a server round-trip. For instance, text can change color or size when a mouse pointer passes over it. Multimedia filters and transition effects can be applied to HTML elements simply by adding the filter CSS attribute.
Absolute positioning. CSS positioning coordinates for existing page content can be updated at any time to create animated effects, without reloading the page.
Data Binding. Data-driven application front ends can be built that present, manipulate (e.g., sort, filter), and update data on the client without numerous round-trips to the server.
Scriptlets. A scriptlet is a Web page, authored with Dynamic HTML, which content providers can use as a component in their Web applications. With scriptlets, content providers can author content once, then easily reuse the content in other Web pages or applications.
Dynamic HTML is the DOM
In a sense, the Document Object Model is the real core of dynamic HTML. It makes HTML changeable. The DOM is the hierarchy of elements that are present in the browser at any given time. This includes environmental information such as the current date and time, browser properties such as the browser's version number, window properties such as window.location (the page's URL), and HTML elements such as
tags, divs, or tables. By exposing the DOM to scripting languages, browsers enable you to access these elements. While some elements such as the time of day can't be changed themselves, they can be used by scripts to modify other elements.
Timed Interactive Multimedia Extensions for HTML
(HTML+TIME)
HTML+TIME (Timed Interactive Multimedia Extensions), first released in Microsoft? Internet Explorer 5, adds timing and media synchronization support to HTML pages. Using a few Extensible Markup Language (XML)-based elements and attributes, you can add images, video, and sounds to an HTML page, and synchronize them with HTML text elements over a specified amount of time.
Using the timing extensions, any HTML element can be set to appear at a given time, to last for a specified duration, and to repeat (i.e. loop).
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