What time period is steampunk?

 Steampunk is a fictional cultural phenomenon that is generally regarded as the imaginary historical territory of the industrial civilization period in the late 19th and early 20th centuries. Steampunk usually combines obsolete technology and industrial design with complex mechanical devices, showing a fantasy and romantic futuristic landscape. Steampunk culture first originated in the 1980s, and has been manifested in movies, games, literature, fashion and other fields. Although the time setting of steampunk is fixed in the period of industrialization, the specific age range is uncertain, because it is more of a fictional culture that spans different eras.