viewPort gives the range of view port occupied by a GraphicsObject, as computed by the package.
viewPort does not take into account the width of "stroke"s.
The object viewPort is a function closure.
The source of this document is in /build/macaulay2-88fgJW/macaulay2-1.25.11+ds/M2/Macaulay2/packages/VectorGraphics.m2:1880:0.