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Layer Basics

To work well with CSS layers in Dreamweaver, you must first understand where they’re coming from and what they’re doing. With that groundwork, you can make the most of them without painting yourself into any nasty corners.

CSS-P and Layers in the Browser

The original CSS1 specification covered various text and other formatting options for page content in HTML. But the W3C wasn’t finished there. CSS-P introduced the capability to govern how elements are positioned on the page (P is for positioning). An expanded version of CSS-P then became part of the CSS2 standard. In addition to positioning, CSS-P allows page elements to be assigned a width, visibility, and even depth (z-index), allowing elements to be layered on the page. (Hence, the term layer.)


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