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CSS Positioning

Layers are part of the world of Cascading Style Sheets and Dynamic HTML. Cascading Style Sheets Positioning, or CSS-P, allows the most specific positioning in HTML to date. Earlier methods, using tables, frames, and frame margins, don't approach the specificity you can reach with CSS-P. Layout tables (see Chapter 12) give you some of the design flexibility, but they don't let you overlap elements, or animate parts of your page with timelines and behaviors.

You can apply CSS Positioning to a block of text, a block-type element, an image, or a layer. There are two ways to apply positioning: One is to create a style class and apply it to the selections or text blocks you want to position on the page (at which point, the object becomes a layer, for all practical purposes). The other is to create a layer in the Document window that you can modify independently of creating a style.


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