> What sort of rendering information do you want? 

Given an element in DOM, i want information about its layout. For example, for 
a given text element i want co-ordinates of the rectangle in which the text 
element is rendered. The co-ordinates can be top,left,bottom,right ( as 
mentioned in the bug pointed by you initially). 
   
  Given a standard window size ( and other enviroment variables which influence 
layout of elements), i want to build a dom which has layout information ( 
rectangle co-ordinates) of each of the elemnent. 
   
  I wanted to build an application on top of DOM which has rendering 
information of its elements. So i wanted to use Gecko layout engine ( and DOM ) 
to get this. It would be difficult for me to use the JavaScript APIs ( exposed 
in the patch described in the inital bug pointed by you ) to get what i want. 
As i have previously said, i want to build an interface to give the url and get 
the DOM with rendering information. I would later serialize it and use it. 
   
   
  Thanks,
  John Alden

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