gtk:printer-hard-margins-for-paper-size (printer size)

printer -- a gtk:printer object
size -- a gtk:paper-size instance

top -- a double float with the top margin
bottom -- a double float with the bottom margin
left -- a double float with the left margin
right -- a double float with the right margin

Retrieve the hard margins of printer for size. The hard margins define the area at the borders of the paper that the printer cannot print to. This will not succeed unless the details of the printer are available, see the gtk:printer-has-details and gtk:printer-request-details function.