How to make a replacement part of the image?

Once saw somewhere such a thing. On the website there is an image if smoothly to use it as a cursor for example from right to left, it is replaced by others. i.e. in the part before the cursor the old image, after already new. How is this implemented? maybe there's some plugin? and how did this miracle called?
June 14th 19 at 18:57
1 answer
June 14th 19 at 18:59
Plugins there are a lot different.

Called - image comparison.
thank you! this is what we need - etha_Rolfson75 commented on June 14th 19 at 19:02

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