I also needed a before/after slider made so I can compare photos. E.g. the before photo and after photo.
I need it a webpage that I can create and load up to a sub folder on my website hosting address. I need to show a header and be able to select the image sizes of the before /after slider or even full page. I also would like to compare 1 photo and then be able to select and compare from multiple other photos I load up. E.g. photo from January. I then load up a photo each month after and compare them to the first image. Feb, March April by clicking on them. Does that make sense? So customer can see what each month a construction site looked like compared to the beginning.
Sample of a slider
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It would also need to work on a mobile device.