This is impressive, but as others have said : it fails to clarify things. One thing that would probably help is on the "colored side" when the mouse moves from

This is impressive, but as others have said : it fails to clarify things. One thing that would probably help is on the "colored side" when the mouse moves from one zone to the other, it should just change the highlights that need to be changed, so we can smoothly visualize where we are. At the moment, when we do this, it first uselessly highlights everything for a second, so we "lose" the ability to visualize "what changed" precisely between the two zones.