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We've covered a great deal of material so far.
Earlier, when you learned or read about previous element sibling,
you may have noticed that there's also a next element sibling property.
And it works in the way you'd expect.
It returns the element immediately following the referenced element.
Now, I'd like to challenge you to use this property to implement a down button for
each list item just as we did earlier with the up button.
So in other words,
the down button will move the item one position downward in the list.
This challenge is a great way to practice what we've learned so far.
And in the next video, I'll show you how I implemented it.
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