If it is in the spec, you can do it. Open and edit compliant style sheets no matter what application created them. Edit style sheets in the of HTML documents, then safely save them back to the document. Specify the browser or browsers that you are designing a style sheet for. Style Master warns you about any aspects of your style sheet that are not fully supported by the browsers you specify, and even gives you some ideas to help you work around these problem areas.
Browsers are still very sensitive to style sheets.
The only way to be sure that the style sheet works as you want it to is by viewing it in a browser. Preview the properties, or the whole style sheet in a preview document of choice. With Style Master you can preview in any number of browsers simultaneously. One touch previewing in all open browsers, or even live previewing in open browsers if you prefer. Style Master doesn't just let you create and edit style sheets, it lets you integrate your style sheets into your web sites.