Get the viewport of a div element

Get the viewport of a div element

Hi everyone,

i have a div element within another div element. The outer div element is smaller than the inner and has overflow set to scroll so i can scroll the 1000px width and height in my outer div.
  1. <div style="width: 100px; height: 100px; overflow: scroll;">
  2.     <div style="width: 1000px; height: 1000px;">some text</div>
  3. </div>
How can i read the current viewport of my outer div element? I want to get the height and width of the upper left corner of the inner width when im scrolling with the outer div.

For example: i scroll down and right 500px height and width. My outer div still remains at 100px height and width but my inner div scrolled to 500px. I hope you understand me?!

Thanks very much in advance