SCR X,Y using SVGPoint & getScreenCTM

Assume the SVG image is contained in a DIV inline within the HTML5 document. However neiher the SVG viewBox nor its width/height are the same as the DIV container. Therfore you must use getScreenCTM to get the x,y values(scr).
A 400x400 DIV containing SVG.
SVG has a viewBox=0 0 2000 2000
SVG clientX/Y - DIV offset
svg X: :svg Y
SVGPoint/getScreenCTM
scr X: :scr Y

SVG Source:
Javascript: