I am using UE 4.16 release.
In the Widget blueprint, I created two URLs that will load different URLs of angular JS drag and drop functionalities.
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In the URL 1, When I click and drag the container 1, It will disappears. Here are some of the screenshots and the URL ( Drag & Drop Lists for angular.js ) of it. **
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Here is the URL 2, ( Drag and Drop Demo )**
I also tested in the Mozilla, chrome, IE, Opera. It’s working perfectly fine.