The convergence of the web and television throws up numerous challenges for usability engineers. These issues tend to be exacerbated by inherent differences between the two technologies. Television viewers on average sit more than 9 feet away from their sets, whereas computer users are usually within 13 inches of their monitors. Television viewers are accustomed to being passive and having information presented to them.
Computer use requires more active interaction and maximizes user initiative.
Page Size Understand the size of the screen on which your page will be displayed. Systems in North America and Japan, based on Microsoft's WebTV, display Web pages in a fixed 544 x 372 screen space. Pages that are wider than 544 pixels will be scaled to fit that width. Conversely, pages that fall short of the regulatory 544 pixels will be displayed within a sea of wasted white space. Instead, use percentages of available space, as opposed to fixed sizes.