Custom elements that allow for dropping

[koyuul]

In the 'New Features' section of the demo, the tabstorage features the ability to drop onto custom elements, which in the case of the demo, was text. From what I could gather reading the docs and the demo code, we are supposed to use onTabDrag and maybe compare rectangle bounding boxes to do this, however the demo code does not really make it clear (at least to my understanding) due to the lack of comments/explanation

Can anyone who has implemented a similar feature but in a more clear way share how they did it?

Thank you!