Cascading style sheets, covered in Chapters 10 and 11, offer a powerful new tool for Web page layout. When used properly, style sheets separate style from document structure, as was originally intended for HTML. Most style properties defined by the Cascading Style Sheets 1 (CSS1) specification are supported by major browsers. However, many of the properties in the CSS2 specification are not. A full listing of CSS1 is presented in this appendix. The visual properties of CSS2 are presented in their entirety; however, the aural properties are only briefly summarized given their lack of use. The appendix concludes with an overview of some of the proprietary CSS properties supported by Internet Explorer, some of which appear slated for inclusion in CSS3.