Example index.html generates error

[deqing]

Downloaded your index.html and found following error when trying to drag instant list item:

Uncaught TypeError: e.target.classList.indexOf is not a function

Then I realized that should be using contains, not indexOf in the index.html code.

If you are happy I can fix the example. Please let me know your thoughts, thanks!

[kornelski]

Yes, a fix is welcome.