The width restriction of 544 pixels is of special importance, because WebTV does not support horizontal scrolling. If your page is wider than 544 pixels, it will be squished to fit in the WebTV browser window. This can make for some particularly unwanted results. For readability, it is recommended you avoid narrow columns with short text fields. Hyperlinks are indicated by a box around the linked object.
Frames are one of the problematic issues.
WebTV does not support any kind of multiple window display, and renders a framed site by putting each frame into an HTML table entry. One serious ramification of this is you may not have one frame that remains static. WebTV does not support scrolling frames either. WebTV is straightforward about identifying itself. With a little care, webmasters can assure that users with physical handicaps can effectively utilize any site.