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There is an emerging DOM or Document Object Model which will be uniform model used by W3C, Netscape, Microsoft
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It allow you to address individual components of a page e.g. text box, image or collections thereof as separate entities
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DOM is quite close to IE 4.0 conventions
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Cascading Style Sheets allow one more powerful ways of assigning properties (such as color fonts etc.) to these components using either name(id) or type (<h2> tag etc.)
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DHTML or dynamic HTML allows one to address the components of document and change on the fly (without reloading page) the properties of these components
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This includes not only natural style properties but also position, size and "visibility"
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DHTML currently handicapped by major differences between IE4 and Netscape 4 -- functionalities are similar but syntax very different
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JavaScript combined with DHTML allows animations, graphs and replacement of just parts of text
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