[jQuery] How to get elements from region?

[Jackal]

Hi,

The API document.elementFromPoint will give me a element by certain
position. But I need a elements by certain region.
For example:
<!-- if this region is top:0, left:0, right: 50, bottom: 10 -->
<div style="display:inline">ABCDEFGHIJKLMNOPQRSTUVWXYZ</div>
<!-- This region would be top:0, left:40, right:60, bottom: 10 -->
<div style="left: -10px">VVVV</div>

I need a document.elementsFromRegion(0, 0, 50, 10), it will return 2
elements.

How do I implement this API using jQuery or native API? Or there is a
existed one?

Thank you very much.