url - Extracting html elements in a given region? -

Looking at the area defined by a rectangular and a URL, there is a way to determine what is given on the basis Elements within the rectangle are present on the given url?

Edit: Screen resolution, font size, etc. Everyone can be set as appropriate defaults

• Get the document from the URL.
• Render it (of the browser).
• For each element in the browser's DOM:
  • Obtain the captured rectangle by element.
  • Comparing the rectangle of the element with the rectangle you are interested in it.