cairo_svg_surface_set_document_unit() is a public function but it is not included in the docs.
What exactly do you mean with "not included in the docs"? As far as I can see, everything is fine with it.
It is not listed in the manual https://www.cairographics.org/manual/cairo-SVG-Surfaces.html
Ah, you mean the only manual. I somehow thought you were building the docs yourself. The only manual is for the latest stable release of cairo (top of the page https://www.cairographics.org/manual/ says "for Cairo 1.14.12"). cairo_svg_surface_set_document_unit is documented as "Since: 1.16": https://cgit.freedesktop.org/cairo/tree/src/cairo-svg-surface.c?id=61122127943dcaff41501e1b06df2a852c576e9b#n444 So, once cairo 1.16.0 becomes a thing and the docs are updated for that release, functions that are new in that stable release show up in the docs.
s/only/online/g
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