Obviously, white backgrounds are simply too important in Web design to restrict them just to accommodate the smaller population of WebTV users. Furthermore, the use of colors that are not Web-safe when designing for diverse audiences is a consideration that developers always need to think carefully about. However, if you're developing content specifically for WebTV, you'll want to keep these issues in mind. Another critical difference in terms of visual design is the way fonts are rendered. WebTV also has its own sizing system for fonts.
Users control the size by setting up their preferences to read fonts as small, medium, or large.
Therefore, designers will always be at the mercy of having their information display to the user preference. This will especially affect any floating images within text, and wrap headers or display text that you've so carefully designed. At this point, the only thing you can do about these concerns is to test your pages to see just how they render at different sizes. Technology WebTV browsers are limited in the technology they support. Since audio, video, and multimedia such as Flash are a natural for the TV environment, you won't encounter technological problems there, although file formats and Flash versions are still limited because of restrictions within the WebTV browser.