Can't get object oriented polygon to work

[The3rdIcon]

The example for the polygon is unclear as it isn't put into context. Below is my attempt at figuring it out but I don't understand why it. The error message I get is "Error in line 17: Uncaught ReferenceError: CSG is not defined"

If you aren't going to take the time with my code can you please at least respond with an example that works that I can copy and paste into the site so I can manipulate that and get something working. The polygons example only used the openscad method which seems more time consuming as I need to figure out how to connect the faces.

a = 10;
b =2.5;
c = -a;
d = -b;
e = 0;

 var polygons = [];
 polygons.push(new CSG.Polygon([
      new CSG.Vertex(new CSG.Vector3D(b,a,e)),
      new CSG.Vertex(new CSG.Vector3D(c,a,e)),
      new CSG.Vertex(new CSG.Vector3D(b,d,e)),
      new CSG.Vertex(new CSG.Vector3D(c,d,e)),
      new CSG.Vertex(new CSG.Vector3D(a,b,e)),
      new CSG.Vertex(new CSG.Vector3D(a,c,e)),
      new CSG.Vertex(new CSG.Vector3D(d,b,e)),
      new CSG.Vertex(new CSG.Vector3D(d,c,e)),
      new CSG.Vertex(new CSG.Vector3D(b,b,e)),
      new CSG.Vertex(new CSG.Vector3D(d,b,e)),
      new CSG.Vertex(new CSG.Vector3D(b,d,e)),
      new CSG.Vertex(new CSG.Vector3D(d,d,e)),
      new CSG.Vertex(new CSG.Vector3D(e,e,a))
   ])
);

var solid = CSG.fromPolygons(polygons);
function main() {
   return solid;
}

[Spiritdude]

Read again the OpenJSCAD documentation: put all functions calls of OpenJSCAD in a function which is called by main(), your polygon.push() is outside of main(), put it into main() or another function which is called by main() eventually. It's a design decision of the original OpenJsCad which I kept for OpenJSCAD.org. I'm aware for starters it's confusing, this is why I prominently describe it: https://github.com/Spiritdude/OpenJSCAD.org/wiki/User-Guide#anatomy-of-a-jscad-file