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  • I'm happy to see an answer! The problem is, the following: When starting to drag the red square from outside of the iframe into the iframe it jumps away from the mouse pointer vertically creating an offset. Especially when the iframe is scrolled. Removing the option to scroll, when the mouse pointer is close to an edge doesn't seem to solve the problem.
    – Sandro
    Commented Sep 23, 2016 at 15:08
  • Thanks for updating your answer. But when I drag the square down to the rectangles the square is still not "attached" to the mouse pointer, right?
    – Sandro
    Commented Sep 23, 2016 at 18:15
  • 1
    Yes, not attached. Need to add top value of iframe to cursor top value. ~60px in the case. Updated Commented Sep 23, 2016 at 19:28
  • Yeah, looks good over the iframe. Can you make that work above the iframe (before moving over the iframe) as well?
    – Sandro
    Commented Sep 23, 2016 at 21:38
  • I think one would need to overwrite jQueryui functionality at some point.
    – Sandro
    Commented Sep 24, 2016 at 7:57