On Windows the actually printing device context is actually smaller then the real page size. Note: testing needs to be done with real printer device/driver) Via GetDeviceCaps it is possible to calculate the real offset, non writeable margins and a lot other. (Creating DC, Querying, Closing DC) Currently the code either uses the user selected margins or css2 page margins, but don't take into account the margins the driver reports: Example: Printer non writeable margin: 0.5cm; User selected or CSS margin: 1cm; Result Win32: 1.5cm; Compared to Linux: 1.0cm; With css3 paged media in mind, re flowing with negative offsets has to be done as well, at least if zoom 100% is selected. Say we have a 210mm width element, margins are set to zero, the resulting box needs to printed so both edges parts get cut. The build-in PDF printing would benefit too. NOTE: Recycling postscript margins isn't possible, as zero and negative offsets are the undefined state. Defaults to: -1