edx/edx-platform — pull request #3559 by srpearce (2014-04-30 21:32:55+00:00)
Title: Update drag and drop documentation

@mhoeber @lamagnifica Please review (I know I don't tell people how to find the X and Y coordinates or the radius - this was originally going to be a simple fix but feature creep is taking over, so I want to create a new story to update this documentation more fully).