There’s a very neat tool by Alex Duner that allows you to create interactive before-and-after images: Juxtapose. Generously, he shared his code on github used the Mozilla Public License, and I am about to create a content library for H5P that uses some of his code. It’s already working, but I’ll have to go bug hunting and also to polish the code and the user interface. Here’s what you can expect (soon).
Just some tech experiments you can have fun with