I am pretty sure this is a Mathematica ExportString [ , “SVG”] bug.

x^2+y^2<1 fails

x^2+y^2>1 works!

The graphic code is from Bostok, pretty sure that is working, maybe needs a bit alteration for Mathematica?

There is a nagging Syntax error, which I do not have the expertise to track.

If someone could figure out the bug then I can send to techsupprot @ wolfram.

Dara