On Wed, 2022-06-22 at 14:01 -0300, George N. White III wrote:
AirPrint was introduced in 2011 to support iPads. https://openprinting.github.io/driverless/01-standards-and-their-pdls/ summarizes the differences in the various Driverless Printing implementations. PDF is supported across the board, but there are several raster formats and also PDFm which is viewable with PDF viewers, but tailored for the capabilities of specific printer models.
I have a HP printer in that boat. It proudly proclaims direct PDF printing (send it a PDF file, or plug a USB into the front with a PDF on it). But after a lot of digging around you find that it only supports a special PDF created by their driver program, no other PDF files are supported.