title: getElement by position?
body: <p>I am working on SVG script</p>
  
  <p>there are getElementById or getElementsByTagName</p>
  
  <p>but I can't find any method to get elements by position</p>
  
  <p>such as get the elements whose position is x=10,y=10.</p>
  
  <p>is there any way I can achieve this? </p>