Before/After Slider for Squarespace Websites

I first saw this beautiful piece of code enabling Before/After imagery on Jon Birdseye's website-- 

The tutorial for installing it on the Squarespace platform is accessible via the link below.

BIG THANKS to Anthony Kramer for writing the tutorial and modifying the code to make it so perfect! I'm looking forward to showcasing more Before/After imagery and attracting more retouching work!