Cascading Style Sheets are an extension to HTML.
Allowing for multiple layers on a single Web page.
The layers can be positioned absolutely, fixed, relative etc. giving the
designer more control over what a browser will display.
CSS layers are an alternative to tables and can have their
own scrollbars separate from the rest of the page.
In addition, CCS layers offers designers more control over the appearance of
fonts, background images, and borders. You can also control the visibility of
the layer with JavaScript. See
here for an Example. Click on the button that says "Hide Colors and
Patterns" you notice the page does not refresh.



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