network, and to be free of resulting regulations, although these rules have since been relaxed. Despite being a major network, in addition to not carrying national morning and evening newscasts, Fox also does not air any network daytime programming (such as soap operas, game shows or talk shows). Because of this, the network's owned-and-operated stations and affiliates handle the responsibility of programming daytime hours with syndicated or locally produced programming (then corporate sister 20th Television distributes several syndicated daytime programs carried by many Fox stations, such as Divorce Court and The Wendy Williams Show; Fox Television Stations also test markets certain series from 20th Television and other syndicators such as Warner Bros. Television Distribution that are proposed for national distribution on some of its stations). The network also does not carry network-supplied children's programming on Saturday mornings or late-night programming on Monday through Friday nights. Local affiliates either produce their own programming or run syndicated programs during these time periods. Because of the erratic scheduling of the network's sports programming, many Fox stations choose to run a mix of syndicated programming, infomercials and especially movies to fill weekend afternoon timeslots when a sports event is not scheduled to air. In addition, from the network's inception, Fox has produced two versions of its program promotions for distribution to the network's stations: a standard version incorporating airtimes based on their broadcast in the Eastern/Central or Pacific/Mountain time zones, depending on the feed used by the station (as those seen during network commercial breaks), and versions with "clean" end tags to allow stations to include local airtime and station information through graphical insertion and verbal continuity by station promotional announcers during the program logo graphic or prime time menu. This practice – which differs from that long used by ABC, NBC and CBS, which only allow their stations to insert logos within their network promotions – was also later adopted by The WB and UPN (and their successors The CW, and to a lesser extent, MyNetworkTV) for use by their affiliated stations. A third cut of these promos exists for national program advertising carried by cable networks (including Fox's sister cable networks), where the wording 'check local listings' is placed in the end tag. Fox is the only broadcast network that currently carries adult animated comedies. This started with The Simpsons in 1989. This is followed up by King of the Hill in