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JavaScript

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HTML 

              
                <div class="slider-mask">
<div id="container" class="AB-slidebar">
    <div class="slider-aft">
      <img src="https://user0514.cdnw.net/shared/img/thumb/SAYA160312500I9A3721_TP_V4.jpg"
        width="800px" height="533px">
    </div>
    <div class="slider-bef">
        <img src="https://user0514.cdnw.net/shared/img/thumb/OOKAWA6_ana20140726104327_TP_V4.jpg"
        width="800px" height="533px">
    </div>
    <div class="handle-wrapper">
        <div class="slider-bar">
            <img src="https://www.flaticon.com/download/icon/59089?icon_id=59089&author=1&team=1&keyword=Arrows+right+and+left+filled+triangles&pack=111235&style=Others&style_id=0&format=png&color=%23000000&colored=1&size=24&selection=1&type=standard&search=right+left+arrow"
            class="slider-handle">
          
</div></div></div></div>
!

CSS 

              
                .slider-mask {
	width:960px;
	height:540px;
	overflow:hidden;
	margin:0 auto;
}
.AB-slidebar {
	position:relative;
    width: 967px;
    height: 540px;
    right: 4px;
    overflow:hidden;
}
.slider-aft, .slider-bef {
    position: absolute;
    top: 0px;
    left: 4px;
    overflow:hidden;
}
.handle-wrapper {
    position:relative;
    width: 8px;
    height: 540px;
    left: 952px;
    z-index:10;
}
.slider-bar {
    width: 1px;
    height: 540px;
    position: absolute;
    left: 4px;
    background-color: white;
    opacity: .7;
}
.slider-handle {
    position: relative;
    top: 255px;
    left: -14px;
    z-index: 100;
}
!

JS 

              
                // Add External Scripts/Pens
//cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js
//ajax.googleapis.com/ajax/libs/jqueryui/1.11.2/jquery-ui.min.js

jQuery(function () {
    var before = $('.slider-bef');
    var after = $('.slider-after');
    var handle = $('.handle-wrapper');
    var slider = $('.AB-slidebar');
	  var tooltip = $('.slider-tip');
    
    var currentWidth = $(before).width(); //get current width of top image
    var newTopWidth = currentWidth * 2/3; //calculate new top width -> 2/3 of current width
    var slideLeft = newTopWidth * 2/3; //set # of pixels to slide left
    var slideRight = newTopWidth; //set # of pixels to slide right
	
    
    before.width(newTopWidth); //set top image with new width
    handle.css('left', newTopWidth); //set left margin for bar

function slideBar(e) {
    
  setTimeout(function () {
     var newWidth = parseInt($(handle).css('left'));
     // set width of before img div 
     before.width(newWidth);
        }, 30);

     e.stopPropagation();
    }


  handle.draggable({
        containment: slider,
        axis: 'x'
    });

  slider.bind('drag', slideBar).bind('mousedown',     function(){
    	tooltip.fadeOut(10);
    });
    

});
!
999px

Console