"Daylight opening" refers to the size and shape of a vehicle's windows or openings. It means the amount of visible space or opening that allows natural light to come inside the vehicle. Full definition
There's fantastic visibility thanks to the large daylight opening and the traditional sedan profile gives the back seat has great headroom. (automobilemag.com)
Antilock brakes became available, and the IROC and IROC R / T models entered their first full year of production after being introduce in February 1991; new features included a clutch interlock or park interlock, new exterior mirrors, and side daylight opening moldings. (allpar.com)
A side daylight opening trimmed in bright metal is a positive element on an otherwise undecorated external envelope. (automobilemag.com)