If you don't use Opera4, you will only be able to read about OperaShow, not experience it yourself. You can switch into fullscreen mode with any document. This is the topic of the next section. This is done by adding a CSS2 style sheet at the top of the document. If you have written documents for the Web, you may be familiar with the concept of style sheets.
Style sheets allow authors to describe how documents are to be presented on the Web.
Opera4 goes one step further by supporting CSS2 . CSS2 adds a number of new features, among them the ability to write style sheets for different media types such as screen, print, speech and projection. When you press the Show key, Opera4 will look for style sheets written especially for projections. If found, these style sheets will be applied and the presentation will change accordingly. Currently, there exists no authoring tools that generate OperaShow presentations.