Drag-and-drop has been with us for decades.It helps us to get things done on desktops, mobile apps and operating systems.There's both a simplicity and intuitiveness that make them one of the most universal UI features.So it's no wonder that drag-and-drop has invaded the web over the past few years.From uploading files in Dropbox to sorting our Trello boards - its usefulness has been proven repeatedly.
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