The viewBox attribute defines the position and dimension, in user space, of an SVG viewport. The value of the viewBox attribute is a list of four numbers:
The numbers separated by whitespace and/or a comma, which specify a rectangle in user space which is mapped to the bounds of the viewport established for the associated SVG element
which part of the SVG is visible - the artboard
It's the crop of the underlying image
There is an implied aspect ratio which van be overridden using the preserveAspectRatio attribute
The polygon element defines a closed shape consisting of a set of connected straight line segments. The last point is connected to the first point.