The Internet Advertising Bureau and the Coalition for Advertising Supported Information and Entertainment jointly issued a set of nine banner ad sizes that they recommended sites and marketers adhere to. The guidelines were intended to make it easier for marketers to advertise on the Web. Changing ad sizes to fit the needs of different sites is counter-productive, marketers said. Several large sites, including Lycos, have publicly supported the IAB/CASIE standards.
Copyright April 1997, Crain Communications Inc.