title: Property getBBox does not exist on type SVGElement
body: <p>I'm using d3, and I'd like to use the getBBox method that SVG elements have.</p>
  
  <p>I'm using the following: <code>(d3Selection.node() as SVGElement).getBBox()</code>, however the TypeScript fails to compile due to the error in the title.</p>
  
  <p>Is SVGElement the wrong type to use? I can it working using <code>any</code> instead, but this seems like a bit of an "unclean" solution.</p>