title: Obtaining an original SVG viewBox via javascript
body: <p>Our system loads SVG files programmatically into HTML via AJAX.  A typical SVG file begins with:</p>
  
  <pre><code> &lt;svg xmlns='http://www.w3.org/2000/svg' viewBox='0,0 65415,41616' xml:space='preserve' height='50.000cm'  width='50.000cm' xmlns:xlink='http://www.w3.org/1999/xlink
  </code></pre>
  
  <p>But strangely in JavaScript there seems to be no way of getting this 'viewBox' back from the SVG DOM - either as a string, or as a set of values.  Under Mozilla, for example,  firebug reports that the svg node has 5 of the 6 attributes we specifiy - namely: xmlns, xml:space, height, width and xmlns:xlink.  But <strong>ViewBox</strong> is conspicuously missing from this list.</p>
  
  <p>Is there anyway to programmatically retrieve this value? - where is it in the SVG DOM? (We cannot introduce 3rd party libraries).</p>