The code would read then:
var coordx = evt.clientX;
var coordy = evt.clientY;
//these coordinates are screen pixels
var matrix=document.documentElement.getScreenCTM().inverse();
//matrix now holds scale/rotation/translate/skew values for both x and y
var coordVBx = matrix.a*coordx+matrix.c*coordy+matrix.e;
var coordVBy = matrix..b*coordx+matrix.d*coordy+matrix.f;
//coordVBx and y are now in the coordinate system of the root elements viewBox coordinate system
var coordx = evt.clientX;
var coordy = evt.clientY;
//these coordinates are screen pixels
var matrix=document.documentElement.getScreenCTM();
//matrix now holds scale/rotation/translate/skew values for both x and y
var coordVBx = matrix.inverse().a*coordx+matrix.inverse().c*coordy+matrix.inverse().e;
var coordVBy = matrix.inverse().b*coordx+matrix.inverse().d*coordy+matrix.inverse().f;
//coordVBx and y are now in the coordinate system of the root elements viewBox coordinate system
see http://www.w3.org/TR/SVG11/coords.html#EstablishingANewUserSpace to see what the matrix values a to f mean.
Good luck, Andreas
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