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Chapter 12. Dynamic HTML > What Is Dynamic HTML?

What Is Dynamic HTML?

With version 4 of both Internet Explorer and Netscape Navigator came Dynamic HTML (DHTML). At the heart of DHTML is the capacity to move objects dynamically on an HTML page and to use absolute positioning. Actually, absolute positioning and dynamic movement are related because changing one absolute position, or a position relative to an absolute one, to a different position simulates movement. To make DHTML work, something had to be available to trigger or drive the dynamic changes. For the most part, this role has been filled by JavaScript and event handlers.

In addition to the capability to put an object where you want it on a page without using tables or frames in HTML, another feature of DHTML is Cascading Style Sheets (CSS). As demonstrated in examples throughout the book, CSS is a designer’s best friend. Not only can all manner of font styles, types, sizes, and weight be controlled, but so can margins, indents, and other structural elements in text.


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