For example, put links to return to main pages. Give the opportunity to the user to return feedback. Remember that some the browsers don't support all the new features of the newest browsers such as Netscape3.0 or Explorer 3.0. Sound and video required special hardware. Not all computers are equipped with sound and video cards.
Figures increase download time.
Pages that display only text is boring the look at. Use graphics, colors, tables, and lists in your pages. Be sure that the figures are not bigger than the size of the screen. Use a simple color palette for the figures.