Topstyle is a Cascading Style Sheet (CSS) tools, You can edit your HTML, XHTML and CSS in a single program, The program offers many unique features, including the option to upgrade your HTML documents by replacing outdated markup with equivalent styling. You can also convert HTML to XHTML and check your CSS syntax against multiple browsers, using a side-by-side preview. A harmonious colors feature allows you to easily create pleasant color schemes for your site and more. I try to use this tools and this is really friendly, use the Style Checker to see how your site will perform under the different versions of browsers as well as pin point any problems. You can also customize the program to meet your own particular needs. But don’t stop there. Even though you may not want to stop using other popular Web authoring Editors, TopStyle integrates easily with other 3rd party programs! TopStyle was created by Nick Bradbury, creator of the HomeSite HTML editor. Cascading Style Sheets (CSS) simplify the act of making global changes across your Web site, but different browsers implement them in different ways. TopStyle enables you to create consistent, easy-to-maintain Web sites in a fraction of the time it would take using a traditional HTML editor. It enables you to define combinations of colors, fonts, margins, borders, and all the key attributes that can be assigned to HTML tags. You can use the built-in preview function to view your work as you build classes of styles, or you can view your pages in any Web browser. TopStyle also integrates with popular HTML editors such as HomeSite, ColdFusion Studio, Microsoft FrontPage, Macromedia Dreamweaver, and a dozen other HTML-building tools. TopStyle solves the problem of inconsistent browser interpretations by flagging errors in your style sheets, and its built-in style checker keeps track of each browser's imperfections, version by version. The program will tell you if you've created style sheets that will be misinterpreted by a particular version of Internet Explorer, Netscape, or Opera, and it enables you to implement workarounds. Get other informations and tips also from here