Future upgrades are supposed to include Java and Shockwave support. In fact, the design guidelines at the WebTV Network site are filled with references to keeping it simple and TV-like. Avoid overloading your viewers with too much information at one time. It is recommended that you design your pages to reduce load time and create the impression of instantaneous response. Design tips and guidelines offered at the WebTV Network site range from the obvious, like avoid small text sizes, to the more subtle, such as don't use horizontal single pixel lines because they flicker on television screens.
Simplicity is stressed.
It is suggested you should try to reduce the number of items on your page because television audiences are used to looking at one focal point. Another point is to try and eliminate scrolling as much as possible. Horizontal scrolling is not supported at all. The WebTV screen size is 560 pixels wide by 384 pixels high, though content should be designed to fit into a 544 x 376 pixel space. Text size defaults to 18 point.