Yes, it is a thing: https://calendar.perfplanet.com/2012/progressive-jpegs-a-new-best-practice/ https://calendar.perfplanet.com/2012/progressive-jpegs-a-new....

Yes, it is a thing: https://calendar.perfplanet.com/2012/progressive-jpegs-a-new-best-practice/ https://calendar.perfplanet.com/2012/progressive-jpegs-a-new.... Some people do use it intentionally.