To prevent zoom calculations

virtualBanner.js

var virtualBanner = {
    elements : [],
    init : function(){
        setInterval(function(self){
            self.update();
        }, 1000, this);
    },
    displayAd : function(elementId, callback){
        setTimeout(function(self){
            self.create(elementId);
        }, 20, this);

        //after DOM element is being created
        setTimeout(function(self){
            PokiSDK.displayAd(
                elementId,
                '728x90',
                callback
            );
        }, 60, this);
    },
    create : function(elementId){
        var element = document.createElement('div');
        var bannerElement = document.getElementById(elementId);

        if(!bannerElement){
            console.warn('Banner element doesnt exist!');
            return false;
        }

        var offset = bannerElement.getBoundingClientRect();

        element.style.width  = '728px';
        element.style.height = '90px';

        element.style.position = 'absolute';

        element.style.left   = offset.left + 'px';
        element.style.bottom = (window.innerHeight - offset.bottom) + 'px';
        
        var scaleRatio = offset.width * 1.0 / 728;

        element.style.transform = 'scale(' + scaleRatio + ')';
        element.style.transformOrigin = 'left bottom';
        element.connectedTo = elementId;

        document.body.appendChild(element);
        this.elements.push(element);
    },
    update : function(){
        var i = this.elements.length;

        while(i--){
            var element = this.elements[i];
            var isExist = document.getElementById(element.connectedTo);

            if(!isExist){
                element.remove();
                this.elements.splice(i, 1);
            }
        }
    }
};

virtualBanner.init();