Been looking at drag and drop to rearrange items in a grid recently. The iOS home screen is a good example of that. Work in progress...
Nice. That is a great web design dev exercise... It's also one that Apple asks you to code / solve when you interview.
Luckily I'd solved that before. Interested to see how you solve it without a a library. :)
Please share how you did this, I'm thinking of a related project!
Just double checked on my device. The icon you move should shake too.