Can anyone please tell me the use of ondrag

Question

https://code.sololearn.com/WWII8oRHE32y/?ref=app

Answer 1

When you hold your mouse clicked on a image from internet and drag it to your screen for example.

That is when the ondrag event activates.
While you drag the image or something else, you can make something to happen.

Answer 2

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https://www.sololearn.com/Discuss/333866/?ref=app