developer.dragndrop
From autoplot.org
Purpose: I've been playing with the ability to drop URIs onto the canvas, and I better document this feature.
Audience: users
1. Introduction
We make a simple way to build up applications by allowing users to drop data URIs onto the canvas.
2. Drop Targets
If a URI is dropped onto a plot, then it's first PlotElement is reset to plot the URI. If it is incomplete and rejected, then the data set editor is entered.
If the URI is dropped just below or just above, then we insert a plot.