Apperently, nowhere in the SVG specification. But Inkscape documentation makes clear that the "user units" in inkscape are defined as 90 dpi. http://inkscape.modevia.com/inkscape-man.html
**-d* /DPI/, *--export-dpi*=/DPI/*
The resolution used for PNG export. The default is 90, which corresponds to 1 SVG user unit (px, also called ``user unit'') exporting to 1 bitmap pixel. This value overrides the DPI hint if used with --export-use-hints.
I don't know why this value seems to be set on stone. I think it should be customizable. For me (I work mostly for print) the 90 dpi set only means that I'll get the wrong sizes when I export or import files and a nightmare when it comes to font sizes.
:-)
Chris Lilley escribió:
On Friday, March 21, 2008, 5:21:00 PM, Guillermo wrote:
GE> Quick and dirty workaround: multiply the desired size by 1.25 GE> For instance: 10 pt type = 12.5 px GE> The explaination of this is that svg uses a resolution of 90 dpi for its GE> pixel size as default. Postscript type units are 72 dpi. GE> 90/72=1.25
Could you point to somewhere in the SVG spec that leads you to this conclusion?