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Editing: jquery.twentytwenty.min.js

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(function($){

$.fn.twentytwenty = function(options) {
    var options = $.extend({
      default_offset_pct: 0.5,
      orientation: 'horizontal',
      before_label: 'Before',
      after_label: 'After',
      no_overlay: false,
      move_slider_on_hover: false,
      move_with_handle_only: true,
      click_to_move: false
    }, options);

return this.each(function() {

var sliderPct = options.default_offset_pct;
      var container = $(this);
      var sliderOrientation = options.orientation;
      var beforeDirection = (sliderOrientation === 'vertical') ? 'down' : 'left';
      var afterDirection = (sliderOrientation === 'vertical') ? 'up' : 'right';

container.wrap("<div class='twentytwenty-wrapper twentytwenty-" + sliderOrientation + "'></div>");
      if(!options.no_overlay) {
        container.append("<div class='twentytwenty-overlay'></div>");
        var overlay = container.find(".twentytwenty-overlay");
        overlay.append("<div class='twentytwenty-before-label' data-content='"+options.before_label+"'></div>");
        overlay.append("<div class='twentytwenty-after-label' data-content='"+options.after_label+"'></div>");
      }
      var beforeImg = container.find("img:first");
      var afterImg = container.find("img:last");
      container.append("<div class='twentytwenty-handle'></div>");
      var slider = container.find(".twentytwenty-handle");
      slider.append("<span class='twentytwenty-" + beforeDirection + "-arrow'></span>");
      slider.append("<span class='twentytwenty-" + afterDirection + "-arrow'></span>");
      container.addClass("twentytwenty-container");
      beforeImg.addClass("twentytwenty-before");
      afterImg.addClass("twentytwenty-after");
      
      var calcOffset = function(dimensionPct) {
        var w = beforeImg.width();
        var h = beforeImg.height();
        return {
          w: w+"px",
          h: h+"px",
          cw: (dimensionPct*w)+"px",
          ch: (dimensionPct*h)+"px"
        };
      };

var adjustSlider = function(pct) {
        var offset = calcOffset(pct);
        slider.css((sliderOrientation==="vertical") ? "top" : "left", (sliderOrientation==="vertical") ? offset.ch : offset.cw);
        adjustContainer(offset);
      };

// Return the number specified or the min/max number if it outside the range given.
      var minMaxNumber = function(num, min, max) {
        return Math.max(min, Math.min(max, num));
      };

// Calculate the slider percentage based on the position.
      var getSliderPercentage = function(positionX, positionY) {
        var sliderPercentage = (sliderOrientation === 'vertical') ?
          (positionY-offsetY)/imgHeight :
          (positionX-offsetX)/imgWidth;

return minMaxNumber(sliderPercentage, 0, 1);
      };

$(window).on("resize.twentytwenty", function(e) {
        adjustSlider(sliderPct);
      });

var moveTarget = options.move_with_handle_only ? slider : container;
      moveTarget.on("movestart",onMoveStart);
      moveTarget.on("move",onMove);
      moveTarget.on("moveend",onMoveEnd);

if (options.move_slider_on_hover) {
        container.on("mouseenter", onMoveStart);
        container.on("mousemove", onMove);
        container.on("mouseleave", onMoveEnd);
      }

slider.on("touchmove", function(e) {
        e.preventDefault();
      });

container.find("img").on("mousedown", function(event) {
        event.preventDefault();
      });

if (options.click_to_move) {
        container.on('click', function(e) {
          offsetX = container.offset().left;
          offsetY = container.offset().top;
          imgWidth = beforeImg.width();
          imgHeight = beforeImg.height();

sliderPct = getSliderPercentage(e.pageX, e.pageY);
          adjustSlider(sliderPct);
        });
      }

$(window).trigger("resize.twentytwenty");
    });
  };

})(jQuery);

Editing: jquery.twentytwenty.min.js

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