https://www.openpolis.it/wp-content/themes/opmag/assets/js/headroom.min.js?ver=0.9.4'%20async='async

1(function(root,factory){"use strict";if(typeof define==="function"&&define.amd){define([],factory)}else if(typeof exports==="object"){module.exports=factory()}else{root.Headroom=factory()}})(this,function(){"use strict";var features={bind:!!function(){}.bind,classList:"classList"in document.documentElement,rAF:!!(window.requestAnimationFrame||window.webkitRequestAnimationFrame||window.mozRequestAnimationFrame)};window.requestAnimationFrame=window.requestAnimationFrame||window.webkitRequestAnimationFrame||window.mozRequestAnimationFrame;function Debouncer(callback){this.callback=callback;this.ticking=false}Debouncer.prototype={constructor:Debouncer,update:function(){this.callback&&this.callback();this.ticking=false},requestTick:function(){if(!this.ticking){requestAnimationFrame(this.rafCallback||(this.rafCallback=this.update.bind(this)));this.ticking=true}},handleEvent:function(){this.requestTick()}};function isDOMElement(obj){return obj&&typeof window!=="undefined"&&(obj===window||obj.nodeType)}function extend(object){if(arguments.length<=0){throw new Error("Missing arguments in extend function")}var result=object||{},key,i;for(i=1;i<arguments.length;i++){var replacement=arguments[i]||{};for(key in replacement){if(typeof result[key]==="object"&&!isDOMElement(result[key])){result[key]=extend(result[key],replacement[key])}else{result[key]=result[key]||replacement[key]}}}return result}function normalizeTolerance(t){return t===Object(t)?t:{down:t,up:t}}function Headroom(elem,options){options=extend(options,Headroom.options);this.lastKnownScrollY=0;this.elem=elem;this.tolerance=normalizeTolerance(options.tolerance);this.classes=options.classes;this.offset=options.offset;this.scroller=options.scroller;this.initialised=false;this.onPin=options.onPin;this.onUnpin=options.onUnpin;this.onTop=options.onTop;this.onNotTop=options.onNotTop;this.onBottom=options.onBottom;this.onNotBottom=options.onNotBottom}Headroom.prototype={constructor:Headroom,init:function(){if(!Headroom.cutsTheMustard){return}this.debouncer=new Debouncer(this.update.bind(this));this.elem.classList.add(this.classes.initial);setTimeout(this.attachEvent.bind(this),100);return this},destroy:function(){var classes=this.classes;this.initialised=false;for(var key in classes){if(classes.hasOwnProperty(key)){this.elem.classList.remove(classes[key])}}this.scroller.removeEventListener("scroll",this.debouncer,false)},attachEvent:function(){if(!this.initialised){this.lastKnownScrollY=this.getScrollY();this.initialised=true;this.scroller.addEventListener("scroll",this.debouncer,false);this.debouncer.handleEvent()}},unpin:function(){var classList=this.elem.classList,classes=this.classes;if(classList.contains(classes.pinned)||!classList.contains(classes.unpinned)){classList.add(classes.unpinned);classList.remove(classes.pinned);this.onUnpin&&this.onUnpin.call(this)}},pin:function(){var classList=this.elem.classList,classes=this.classes;if(classList.contains(classes.unpinned)){classList.remove(classes.unpinned);classList.add(classes.pinned);this.onPin&&this.onPin.call(this)}},top:function(){var classList=this.elem.classList,classes=this.classes;if(!classList.contains(classes.top)){classList.add(classes.top);classList.remove(classes.notTop);this.onTop&&this.onTop.call(this)}},notTop:function(){var classList=this.elem.classList,classes=this.classes;if(!classList.contains(classes.notTop)){classList.add(classes.notTop);classList.remove(classes.top);this.onNotTop&&this.onNotTop.call(this)}},bottom:function(){var classList=this.elem.classList,classes=this.classes;if(!classList.contains(classes.bottom)){classList.add(classes.bottom);classList.remove(classes.notBottom);this.onBottom&&this.onBottom.call(this)}},notBottom:function(){var classList=this.elem.classList,classes=this.classes;if(!classList.contains(classes.notBottom)){classList.add(classes.notBottom);classList.remove(classes.bottom);this.onNotBottom&&this.onNotBottom.call(this)}},getScrollY:function(){return this.scroller.pageYOffset!==undefined?this.scroller.pageYOffset:this.scroller.scrollTop!==undefined?this.scroller.scrollTop:(document.documentElement||document.body.parentNode||document.body).scrollTop}

1,getViewportHeight:function(){return window.innerHeight||document.documentElement.clientHeight||document.body.clientHeight},getElementPhysicalHeight:function(elm){return Math.max(elm.offsetHeight,elm.clientHeight)},getScrollerPhysicalHeight:function(){return this.scroller===window||this.scroller===document.body?this.getViewportHeight():this.getElementPhysicalHeight(this.scroller)},getDocumentHeight:function(){var body=document.body,documentElement=document.documentElement;return Math.max(body.scrollHeight,documentElement.scrollHeight,body.offsetHeight,documentElement.offsetHeight,body.clientHeight,documentElement.clientHeight)},getElementHeight:function(elm){return Math.max(elm.scrollHeight,elm.offsetHeight,elm.clientHeight)},getScrollerHeight:function(){return this.scroller===window||this.scroller===document.body?this.getDocumentHeight():this.getElementHeight(this.scroller)},isOutOfBounds:function(currentScrollY){var pastTop=currentScrollY<0,pastBottom=currentScrollY+this.getScrollerPhysicalHeight()>this.getScrollerHeight();return pastTop||pastBottom},toleranceExceeded:function(currentScrollY,direction){return Math.abs(currentScrollY-this.lastKnownScrollY)>=this.tolerance[direction]},shouldUnpin:function(currentScrollY,toleranceExceeded){var scrollingDown=currentScrollY>this.lastKnownScrollY,pastOffset=currentScrollY>=this.offset;return scrollingDown&&pastOffset&&toleranceExceeded},shouldPin:function(currentScrollY,toleranceExceeded){var scrollingUp=currentScrollY<this.lastKnownScrollY,pastOffset=currentScrollY<=this.offset;return scrollingUp&&toleranceExceeded||pastOffset},update:function(){var currentScrollY=this.getScrollY(),scrollDirection=currentScrollY>this.lastKnownScrollY?"down":"up",toleranceExceeded=this.toleranceExceeded(currentScrollY,scrollDirection);if(this.isOutOfBounds(currentScrollY)){return}if(currentScrollY<=this.offset){this.top()}else{this.notTop()}if(currentScrollY+this.getViewportHeight()>=this.getScrollerHeight()){this.bottom()}else{this.notBottom()}if(this.shouldUnpin(currentScrollY,toleranceExceeded)){this.unpin()}else if(this.shouldPin(currentScrollY,toleranceExceeded)){this.pin()}this.lastKnownScrollY=currentScrollY}};Headroom.options={tolerance:{up:0,down:0},offset:0,scroller:window,classes:{pinned:"headroom--pinned",unpinned:"headroom--unpinned",top:"headroom--top",notTop:"headroom--not-top",bottom:"headroom--bottom",notBottom:"headroom--not-bottom",initial:"headroom"}};Headroom.cutsTheMustard=typeof features!=="undefined"&&features.rAF&&features.bind&&features.classList;return Headroom});