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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

            
              <div id="container" class="slider-container">
    <span class="slider-handle"></span>
</div>
            
          
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              html, body {
	height: 100%;
  margin: 0;
  padding: 0;
}

* {
  outline: 0;
}

#container {
	position: relative;
	height: 100%;
}

.slider-handle {

	position: absolute;

	height: 44px;
	width: 44px;

	/* center the element */
	left: 50%;
	top: 50%;

	margin-left: -22px;
	margin-top: -22px;

	border-radius: 50%;

	background: #dc717d url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="32" height="32" viewBox="0 0 32 32"><path fill="#FFF" d="M13 21l-5-5 5-5m6 0l5 5-5 5"/></svg>') no-repeat center center;
	cursor: move;

	box-shadow: 0 0 0 6px rgba(0, 0, 0, 0.2), 0 0 10px rgba(0, 0, 0, 0.6), inset 0 1px 0 rgba(255, 255, 255, 0.3);
	z-index: 2;

}

.slider-handle.draggable {
	background-color: #445b7c;
}
            
          
!
            
              // Proof of concept by Illya Moskvin, IMA Lab, Indianapolis Museum of Art
// MIT License, free (gratis and libre) for any use, we take no responsibility :P

// Image comparison slider, loosely based on the following:
// https://codyhouse.co/gem/css-jquery-image-comparison-slider/

// Initialize the viewer
var viewer = OpenSeadragon({
    id:              "container",
    xmlns:           "http://schemas.microsoft.com/deepzoom/2008",
    prefixUrl:       "//openseadragon.github.io/openseadragon/images/"
});

// Create a point exactly in the middle of the viewport
var $viewer = $('#container');

var middle = new OpenSeadragon.Point( $viewer.width() / 2, $viewer.height() / 2 );

function updateMiddle( offset ) {
    middle.x = offset;
}

// Keep track of the two images we're splitting
var leftImage = null;
var rightImage = null;

var leftRect = new OpenSeadragon.Rect( 0,0,0,0 );
var rightRect = new OpenSeadragon.Rect( 0,0,0,0 );

viewer.addTiledImage( {
    tileSource: 'https://dlcs.io/iiif-img/3/2/04fbbb28-d5a7-4408-b7da-800c4e65eda3/info.json',
    success: function( event ) {

        leftImage = event.item;
        imagesLoaded();

    }
});

viewer.addTiledImage( {
    tileSource: 'https://dlcs.io/iiif-img/3/2/8034eb5b-9c90-4471-ad68-52124232ec0c/info.json',
    success: function( event ) {

        rightImage = event.item;
        imagesLoaded();

    }
});

// Handle pan and zoom events
viewer.addHandler('animation', function (viewer) {

    imagesClip();

})

// Basic function to check when both images are loaded
function imagesLoaded() {
    if( leftImage && rightImage ) {

        leftRect.height = leftImage.getContentSize().y;
        rightRect.height = rightImage.getContentSize().y;

        imagesClip();

        initClip();

    }
}

function imagesClip(  ) {

    var rox = rightImage.viewerElementToImageCoordinates( middle ).x;
    var lox = leftImage.viewerElementToImageCoordinates( middle ).x;

    rightRect.x = rox ;
    rightRect.width = rightImage.getContentSize().x - rox;

    leftRect.width = lox;

    leftImage.setClip( leftRect );
    rightImage.setClip( rightRect );

}

function initClip() {

    //console.log( leftImage, rightImage );
    //console.log( rightImage.getContentSize() );

    // TODO: Abstract this away
    var $handle = $('.slider-handle');
    var $container = $handle.parents('.slider-container');

    // We will assume that the width of the handle element does not change
    var dragWidth = $handle.outerWidth();

    // However, we will track when the container resizes
    var containerWidth, containerOffest, minLeft, maxLeft;

    function updateContainerDimensions() {

        containerWidth = $container.outerWidth();
        containerOffset = $container.offset().left;
        minLeft = containerOffset + 10;
        maxLeft = containerOffset + containerWidth - dragWidth - 10;

        // Spoof the mouse events
        var offset = $handle.offset().left + dragWidth / 2;
        var event;

        // Bind the drag event
        event = new jQuery.Event("mousedown");
        event.pageX = offset;

        $handle.trigger( event );

        // Execute the drag event
        event = new jQuery.Event("mousemove");
        event.pageX = offset;

        $container.trigger( event );

        // Unbind the drag event
        $handle.trigger("mouseup");

    }

    // Retrieve initial container dimention 
    updateContainerDimensions();

    // Bind the container resize
    $(window).resize( updateContainerDimensions );

    // We are just going to assume jQuery is loaded by now
    // Eventually, I'll make this work without jQuery
    $handle.on("mousedown vmousedown", function(e) {

        var xPosition = $handle.offset().left + dragWidth - e.pageX;

        function trackDrag(e) {

            var leftValue = e.pageX + xPosition - dragWidth;
                
            //constrain the draggable element to move inside its container
            leftValue = Math.max(leftValue, minLeft);
            leftValue = Math.min(leftValue, maxLeft);

            var widthPixel = (leftValue + dragWidth/2 - containerOffset);
            var widthFraction = widthPixel/containerWidth;
            var widthPercent = widthFraction*100+'%';
            
            $handle.css('left', widthPercent);

            updateMiddle( widthPixel );
            imagesClip( );

        }

        $container.on("mousemove vmousemove", trackDrag);

        $handle.add($container).one("mouseup vmouseup", function(e) {
            $container.unbind("mousemove vmousemove", trackDrag);
        });

        e.preventDefault();

    });

}
            
          
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