/*! For license information please see archive.bundle.min.js.LICENSE.txt */
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")+'" aria-selected="'+n+'"><button class="pika-button pika-day" type="button" data-pika-year="'+t.year+'" data-pika-month="'+t.month+'" data-pika-day="'+t.day+'">'+t.day+"</button></td>"},S=function(n,i,s,r){var o=new Date(s,i,n);return'<td class="pika-week">'+(e?t(o).isoWeek():function(t,e){t.setHours(0,0,0,0);var n=t.getDate(),i=t.getDay(),s=e,r=s-1,o=function(t){return(t+7-1)%7};t.setDate(n+r-o(i));var a=new Date(t.getFullYear(),0,s),l=(t.getTime()-a.getTime())/864e5;return 1+Math.round((l-r+o(a.getDay()))/7)}(o,r))+"</td>"},D=function(t,e,n,i){return'<tr class="pika-row'+(n?" pick-whole-week":"")+(i?" is-selected":"")+'">'+(e?t.reverse():t).join("")+"</tr>"},E=function(t,e,n,i,s,r){var o,a,l,c,u,d=t._o,p=n===d.minYear,f=n===d.maxYear,m='<div id="'+r+'" class="pika-title" role="heading" aria-live="assertive">',v=!0,y=!0;for(l=[],o=0;o<12;o++)l.push('<option value="'+(n===s?o-e:12+o-e)+'"'+(o===i?' selected="selected"':"")+(p&&o<d.minMonth||f&&o>d.maxMonth?' disabled="disabled"':"")+">"+d.i18n.months[o]+"</option>");for(c='<div class="pika-label">'+d.i18n.months[i]+'<select class="pika-select pika-select-month" tabindex="-1">'+l.join("")+"</select></div>",h(d.yearRange)?(o=d.yearRange[0],a=d.yearRange[1]+1):(o=n-d.yearRange,a=1+n+d.yearRange),l=[];o<a&&o<=d.maxYear;o++)o>=d.minYear&&l.push('<option value="'+o+'"'+(o===n?' selected="selected"':"")+">"+o+"</option>");return u='<div class="pika-label">'+n+d.yearSuffix+'<select class="pika-select pika-select-year" tabindex="-1">'+l.join("")+"</select></div>",d.showMonthAfterYear?m+=u+c:m+=c+u,p&&(0===i||d.minMonth>=i)&&(v=!1),f&&(11===i||d.maxMonth<=i)&&(y=!1),0===e&&(m+='<button class="pika-prev'+(v?"":" is-disabled")+'" type="button">'+d.i18n.previousMonth+"</button>"),e===t._o.numberOfMonths-1&&(m+='<button class="pika-next'+(y?"":" is-disabled")+'" type="button">'+d.i18n.nextMonth+"</button>"),m+"</div>"},I=function(t,e,n){return'<table cellpadding="0" cellspacing="0" class="pika-table" role="grid" aria-labelledby="'+n+'">'+function(t){var e,n=[];for(t.showWeekNumber&&n.push("<th></th>"),e=0;e<7;e++)n.push('<th scope="col"><abbr title="'+k(t,e)+'">'+k(t,e,!0)+"</abbr></th>");return"<thead><tr>"+(t.isRTL?n.reverse():n).join("")+"</tr></thead>"}(t)+("<tbody>"+e.join("")+"</tbody></table>")},A=function(o){var l=this,c=l.config(o);l._onMouseDown=function(t){if(l._v){var e=(t=t||window.event).target||t.srcElement;if(e)if(a(e,"is-disabled")||(!a(e,"pika-button")||a(e,"is-empty")||a(e.parentNode,"is-disabled")?a(e,"pika-prev")?l.prevMonth():a(e,"pika-next")&&l.nextMonth():(l.setDate(new Date(e.getAttribute("data-pika-year"),e.getAttribute("data-pika-month"),e.getAttribute("data-pika-day"))),c.bound&&s(function(){l.hide(),c.blurFieldOnSelect&&c.field&&c.field.blur()},100))),a(e,"pika-select"))l._c=!0;else{if(!t.preventDefault)return t.returnValue=!1,!1;t.preventDefault()}}},l._onChange=function(t){var 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0!==e.bound?e.field&&e.bound:e.field),e.trigger=e.trigger&&e.trigger.nodeName?e.trigger:e.field,e.disableWeekends=!!e.disableWeekends,e.disableDayFn="function"==typeof e.disableDayFn?e.disableDayFn:null;var n=parseInt(e.numberOfMonths,10)||1;if(e.numberOfMonths=n>4?4:n,u(e.minDate)||(e.minDate=!1),u(e.maxDate)||(e.maxDate=!1),e.minDate&&e.maxDate&&e.maxDate<e.minDate&&(e.maxDate=e.minDate=!1),e.minDate&&this.setMinDate(e.minDate),e.maxDate&&this.setMaxDate(e.maxDate),h(e.yearRange)){var i=(new Date).getFullYear()-10;e.yearRange[0]=parseInt(e.yearRange[0],10)||i,e.yearRange[1]=parseInt(e.yearRange[1],10)||i}else e.yearRange=Math.abs(parseInt(e.yearRange,10))||w.yearRange,e.yearRange>100&&(e.yearRange=100);return e},toString:function(n){return n=n||this._o.format,u(this._d)?this._o.toString?this._o.toString(this._d,n):e?t(this._d).format(n):this._d.toDateString():""},getMoment:function(){return e?t(this._d):null},setMoment:function(n,i){e&&t.isMoment(n)&&this.setDate(n.toDate(),i)},getDate:function(){return u(this._d)?new Date(this._d.getTime()):null},setDate:function(t,e){if(!t)return this._d=null,this._o.field&&(this._o.field.value="",g(this._o.field,"change",{firedBy:this})),this.draw();if("string"==typeof t&&(t=new Date(Date.parse(t))),u(t)){var n=this._o.minDate,i=this._o.maxDate;u(n)&&t<n?t=n:u(i)&&t>i&&(t=i),this._d=new Date(t.getTime()),m(this._d),this.gotoDate(this._d),this._o.field&&(this._o.field.value=this.toString(),g(this._o.field,"change",{firedBy:this})),e||"function"!=typeof this._o.onSelect||this._o.onSelect.call(this,this.getDate())}},clear:function(){this.setDate(null)},gotoDate:function(t){var e=!0;if(u(t)){if(this.calendars){var n=new Date(this.calendars[0].year,this.calendars[0].month,1),i=new 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Date)},gotoMonth:function(t){isNaN(t)||(this.calendars[0].month=parseInt(t,10),this.adjustCalendars())},nextMonth:function(){this.calendars[0].month++,this.adjustCalendars()},prevMonth:function(){this.calendars[0].month--,this.adjustCalendars()},gotoYear:function(t){isNaN(t)||(this.calendars[0].year=parseInt(t,10),this.adjustCalendars())},setMinDate:function(t){t instanceof Date?(m(t),this._o.minDate=t,this._o.minYear=t.getFullYear(),this._o.minMonth=t.getMonth()):(this._o.minDate=w.minDate,this._o.minYear=w.minYear,this._o.minMonth=w.minMonth,this._o.startRange=w.startRange),this.draw()},setMaxDate:function(t){t instanceof Date?(m(t),this._o.maxDate=t,this._o.maxYear=t.getFullYear(),this._o.maxMonth=t.getMonth()):(this._o.maxDate=w.maxDate,this._o.maxYear=w.maxYear,this._o.maxMonth=w.maxMonth,this._o.endRange=w.endRange),this.draw()},setStartRange:function(t){this._o.startRange=t},setEndRange:function(t){this._o.endRange=t},draw:function(t){if(this._v||t){var e,n=this._o,i=n.minYear,r=n.maxYear,o=n.minMonth,a=n.maxMonth,l="";this._y<=i&&(this._y=i,!isNaN(o)&&this._m<o&&(this._m=o)),this._y>=r&&(this._y=r,!isNaN(a)&&this._m>a&&(this._m=a));for(var c=0;c<n.numberOfMonths;c++)e="pika-title-"+Math.random().toString(36).replace(/[^a-z]+/g,"").substr(0,2),l+='<div class="pika-lendar">'+E(this,c,this.calendars[c].year,this.calendars[c].month,this.calendars[0].year,e)+this.render(this.calendars[c].year,this.calendars[c].month,e)+"</div>";this.el.innerHTML=l,n.bound&&"hidden"!==n.field.type&&s(function(){n.trigger.focus()},1),"function"==typeof this._o.onDraw&&this._o.onDraw(this),n.bound&&n.field.setAttribute("aria-label",n.ariaLabel)}},adjustPosition:function(){var t,e,n,s,r,o,a,h,u,d,p,f;if(!this._o.container){if(this.el.style.position="absolute",e=t=this._o.trigger,n=this.el.offsetWidth,s=this.el.offsetHeight,r=window.innerWidth||i.documentElement.clientWidth,o=window.innerHeight||i.documentElement.clientHeight,a=window.pageYOffset||i.body.scrollTop||i.documentElement.scrollTop,p=!0,f=!0,"function"==typeof t.getBoundingClientRect)h=(d=t.getBoundingClientRect()).left+window.pageXOffset,u=d.bottom+window.pageYOffset;else 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n=r(this.interactiveChildElements,1)[0];this.firstItem=n,this.lastItem=this.interactiveChildElements[this.interactiveChildElements.length-1]}this.state={expanded:!1},this.setup=this.setup.bind(this),this.destroy=this.destroy.bind(this),this.manageExpandedState=this.manageExpandedState.bind(this),this.setExpandedState=this.setExpandedState.bind(this),this.controllerKeyDownHandler=this.controllerKeyDownHandler.bind(this),this.targetKeyDownHandler=this.targetKeyDownHandler.bind(this),this.closeOnTabOut=this.closeOnTabOut.bind(this),this.closeOnOutsideClick=this.closeOnOutsideClick.bind(this),this.setup()},[{key:"setExpandedState",value:function(t){this.controller.setAttribute("aria-expanded","".concat(t)),this.target.setAttribute("aria-hidden","".concat(!t)),this.state.expanded=t}},{key:Symbol.toStringTag,get:function(){return this.stringDescription}},{key:"setup",value:function(){var t=this.state.expanded;this.controller.popup=this,this.target.popup=this,this.controller.setAttribute("aria-haspopup","menu"),this.controller.setAttribute("aria-expanded","".concat(t)),this.controller.setAttribute("aria-controls",this.target.id),this.target!==this.controller.nextElementSibling&&this.controller.setAttribute("aria-owns",this.target.id),this.target.setAttribute("aria-hidden","".concat(!t)),this.controller.addEventListener("click",this.manageExpandedState),this.controller.addEventListener("keydown",this.controllerKeyDownHandler),this.target.addEventListener("keydown",this.targetKeyDownHandler),document.body.addEventListener("click",this.closeOnOutsideClick)}},{key:"destroy",value:function(){this.controller.popup=null,this.target.popup=null,this.controller.removeAttribute("aria-haspopup"),this.controller.removeAttribute("aria-expanded"),this.controller.removeAttribute("aria-controls"),this.target!==this.controller.nextElementSibling&&this.controller.removeAttribute("aria-owns"),this.target.removeAttribute("aria-hidden"),this.controller.removeEventListener("click",this.manageExpandedState),this.controller.removeEventListener("keydown",this.controllerKeyDownHandler),this.target.removeEventListener("keydown",this.targetKeyDownHandler),document.body.removeEventListener("click",this.closeOnOutsideClick),this.state={expanded:!1}}},{key:"controllerKeyDownHandler",value:function(t){if(this.state.expanded){var e=H.ESC,n=H.TAB,i=t.keyCode;e===i?(t.stopPropagation(),t.preventDefault(),this.setExpandedState(!1)):n===i&&(t.preventDefault(),this.firstItem.focus())}}},{key:"targetKeyDownHandler",value:function(t){var e=H.ESC,n=H.TAB,i=t.keyCode,s=this.state.expanded,r=document.activeElement;e===i&&s?(t.stopPropagation(),t.preventDefault(),this.setExpandedState(!1),this.controller.focus()):n===i&&(!t.shiftKey||this.firstItem!==r&&this.target!==r?this.lastChild===r&&this.setExpandedState(!1):(t.preventDefault(),this.controller.focus()))}},{key:"manageExpandedState",value:function(t){t.preventDefault(),this.state.expanded?this.setExpandedState(!1):this.setExpandedState(!0)}},{key:"closeOnTabOut",value:function(t){H.TAB===t.keyCode&&!t.shiftKey&&this.state.expanded&&this.setExpandedState(!1)}},{key:"closeOnOutsideClick",value:function(t){this.state.expanded&&t.target!==this.controller&&!this.target.contains(t.target)&&this.setExpandedState(!1)}}])}(),Y=function(){function t(e){o(this,t),this.stringDescription="MenuItem",this.list=e,Object.assign(e,{menuItem:this}),this.listItems=Array.prototype.slice.call(e.children),this.handleListKeydown=this.handleListKeydown.bind(this),this.destroy=this.destroy.bind(this),this.init()}return h(t,[{key:Symbol.toStringTag,get:function(){return this.stringDescription}},{key:"init",value:function(){var e=this;this.menuItems=this.listItems.reduce(function(t,e){var n=e.firstElementChild;return null!==n&&"A"===n.nodeName?[].concat(f(t),[n]):t},[]),this.menuItemsLength=this.menuItems.length,this.menuItems.forEach(function(n){n.addEventListener("keydown",e.handleListKeydown);var i=e.constructor.nextElementIsUl(n);i&&(new t(i).previousSibling=n)});var n=r(this.menuItems,1);this.firstItem=n[0],this.lastItem=this.menuItems[this.menuItemsLength-1]}},{key:"handleListKeydown",value:function(t){var e=t.keyCode,n=H.UP,i=H.DOWN,s=H.LEFT,r=H.RIGHT,o=document.activeElement,a=this.list.contains(o)?o:this.menuItems[0],l=this.menuItems.length-1,c=this.menuItems.indexOf(a);if([n,i].includes(e)){t.stopPropagation(),t.preventDefault();var h=e===n?c-1:c+1;n===e&&h<0&&(h=l),i===e&&l<h&&(h=0),this.menuItems[h].focus()}else if(r===e){var u=this.constructor.nextElementIsUl(a);u&&Object.hasOwnProperty.call(u,"menuItem")&&(t.stopPropagation(),t.preventDefault(),u.menuItem.firstItem.focus())}else if(s===e&&void 0!==this.previousSibling){var d;if(t.stopPropagation(),t.preventDefault(),"[object Popup]"===(null===(d=this.previousSibling)||void 0===d||null===(d=d.popup)||void 0===d?void 0:d.toString())){t.stopPropagation(),t.preventDefault();var p=this.previousSibling.popup;p.state.expanded&&p.setExpandedState(!1)}this.previousSibling.focus()}}},{key:"destroy",value:function(){var t=this;void 0!==this.list.menuItem&&(this.list.menuItem=null,this.menuItems.forEach(function(e){var n;e.removeEventListener("keydown",t.handleListKeydown);var i=t.constructor.nextElementIsUl(e);i&&void 0!==i.menuItem&&"[object MenuItem]"===(null==i||null===(n=i.menuItem)||void 0===n?void 0:n.toString())&&i.menuItem.destroy()}))}}],[{key:"nextElementIsUl",value:function(t){var e=t.nextElementSibling;return null!==e&&"UL"===e.nodeName&&e}}])}(),z=function(){return h(function t(e){o(this,t),this.stringDescription="Menu",this.menu=e,this.popups=[],K({"":{}},"sciencenews"),this.manageState=this.manageState.bind(this),this.handleMenuBarKeydown=this.handleMenuBarKeydown.bind(this),this.handleMenuBarClick=this.handleMenuBarClick.bind(this),this.destroy=this.destroy.bind(this),this.init()},[{key:Symbol.toStringTag,get:function(){return this.stringDescription}},{key:"manageState",value:function(t){this.state=Object.assign(this.state,t),Object.prototype.hasOwnProperty.call(t,"activeDescendant")&&this.state.activeDescendant.focus()}},{key:"init",value:function(){var t=this;this.menu.menu=this,this.menuItemsCollection=this.menu.children,this.menuItemsArray=Array.prototype.slice.call(this.menuItemsCollection),this.menuBarItems=this.menuItemsArray.reduce(function(t,e){var n=e.firstElementChild;return null!==n&&"A"===n.nodeName?[].concat(f(t),[n]):t},[]),this.menuLength=this.menuBarItems.length,this.menuBarItems.forEach(function(e){e.addEventListener("keydown",t.handleMenuBarKeydown),e.addEventListener("click",t.handleMenuBarClick)}),this.lastIndex=this.menuLength-1;var e=r(this.menuBarItems,1);this.firstItem=e[0],this.lastItem=this.menuBarItems[this.lastIndex],this.state={activeDescendant:this.firstItem},this.popups=this.menuBarItems.reduce(function(e,n){var i=n.nextElementSibling;if(null!==i&&"UL"===i.nodeName){var s=new q({controller:n,target:i});return i.addEventListener("keydown",t.handleListKeydown),new Y(i).previousSibling=n,[].concat(f(e),[s])}return e},[])}},{key:"handleMenuBarKeydown",value:function(t){var e=H.LEFT,n=H.RIGHT,i=H.DOWN,s=t.keyCode,r=this.state.activeDescendant,o=this.menuBarItems.indexOf(r);if([e,n].includes(s)){t.stopPropagation(),t.preventDefault();var a=s===e?o-1:o+1;e===s&&a<0&&(a=this.lastIndex),n===s&&this.lastIndex<a&&(a=0),this.manageState({activeDescendant:this.menuBarItems[a]})}else if(i===s){var l;if("[object Popup]"===(null==r||null===(l=r.popup)||void 0===l?void 0:l.toString())){t.stopPropagation(),t.preventDefault();var c=r.popup;c.state.expanded||c.setExpandedState(!0),c.firstItem.focus()}}}},{key:"handleMenuBarClick",value:function(t){this.manageState({activeDescendant:t.target})}},{key:"destroy",value:function(){var t=this;this.menuItemsCollection=this.menu.children,this.menuItemsArray=Array.prototype.slice.call(this.menuItemsCollection),this.menuBarItems.forEach(function(e){e.removeEventListener("keydown",t.handleMenuBarKeydown),e.removeEventListener("click",t.handleMenuBarClick)}),this.popups.length>0&&this.popups.forEach(function(t){var e;void 0!==t.target.menuItem&&"[object MenuItem]"===(null==t||null===(e=t.target)||void 0===e||null===(e=e.menuItem)||void 0===e?void 0:e.toString())&&t.target.menuItem.destroy(),t.destroy()})}}])}(),$=function(){return h(function t(e,n,i){var s=arguments.length>3&&void 0!==arguments[3]?arguments[3]:250;o(this,t),Object.assign(this,{callback:i,event:n,element:e,frequency:s,timeout:!1}),this.requestTick=this.requestTick.bind(this),this.update=this.update.bind(this),this.callback?this.element.addEventListener(this.event,this.requestTick):console.error("Throttle error: you must specify a callback.")},[{key:"update",value:function(){this.callback(),window.clearTimeout(this.timeout),this.timeout=!1}},{key:"requestTick",value:function(){var t=this;this.timeout||(this.timeout=window.setTimeout(function(){window.requestAnimationFrame(t.update)},this.frequency))}},{key:"destroy",value:function(){this.element.removeEventListener(this.event,this.requestTick)}}])}();function V(){var t=arguments.length>0&&void 0!==arguments[0]?arguments[0]:36,e=r(Math.random().toString(t).split("."),2)[1];return"id_".concat(e)}function X(t,e){var n=document.createElement("span");return n.classList.add("screen-reader-text"),Object.assign(n,{id:t,innerText:e}),n}var G=function(){return h(function t(e){o(this,t),this.list=e,this.articleItems=Array.prototype.slice.call(e.children),K({"":{}},"sciencenews"),Object.assign(this,{firstItem:this.articleItems[0]}),this.lastIndex=this.articleItems.length-1,this.state={activeDescendant:this.firstItem},this.prepItems=this.prepItems.bind(this),this.updateActiveState=this.updateActiveState.bind(this),this.clearActiveState=this.clearActiveState.bind(this),this.getParentPopup=this.getParentPopup.bind(this),this.handleListBlur=this.handleListBlur.bind(this),this.handleListKeydown=this.handleListKeydown.bind(this),this.parentPopup=this.getParentPopup(),this.prepItems(),this.init()},[{key:"getParentPopup",value:function(){for(var t=this.list.parentElement;"[object Popup]"!==(null===(e=t)||void 0===e||null===(e=e.popup)||void 0===e?void 0:e.toString());){var e;t=t.parentElement}return t.popup}},{key:"prepItems",value:function(){this.articleItems.forEach(function(t){var e=W(t);""===t.id&&t.setAttribute("id",V()),e.forEach(function(e){e.setAttribute("id",V()),e.setAttribute("data-child-of",t.id)})})}},{key:"updateActiveState",value:function(t){this.state.activeDescendant.removeAttribute("aria-selected"),this.state.activeDescendant=t,this.list.setAttribute("aria-activedescendant",t.id),t.setAttribute("aria-selected","true")}},{key:"clearActiveState",value:function(){var t=this.state.activeDescendant;this.list.removeAttribute("aria-activedescendant"),t.removeAttribute("aria-selected"),this.state.activeDescendant=this.firstItem,this.list.setAttribute("aria-describedby",this.initialListDescribedby)}},{key:"init",value:function(){this.list.setAttribute("role","group"),this.list.setAttribute("tabindex","0"),this.initialListDescribedby="group-widget-list-help group-widget-list-enter-help group-widget-esc-help",this.activeListDescribedby="group-widget-list-help group-widget-move-back-help group-widget-tab-help group-widget-esc-help",this.constructor.addHelpText(),this.list.setAttribute("aria-describedby",this.initialListDescribedby),this.list.addEventListener("blur",this.handleListBlur),this.list.addEventListener("keydown",this.handleListKeydown)}},{key:"handleListBlur",value:function(){this.list.contains(document.activeElement)||this.clearActiveState()}},{key:"handleListKeydown",value:function(t){var e=H.UP,n=H.DOWN,i=H.RIGHT,s=H.LEFT,o=H.TAB,a=t.keyCode,l=t.shiftKey,c=this.state.activeDescendant,h=this.articleItems.indexOf(c),u=this.list.hasAttribute("aria-activedescendant"),d=this.constructor.getItemParent(c);if(u||(i===a?(t.preventDefault(),this.updateActiveState(this.firstItem),this.list.setAttribute("aria-describedby",this.activeListDescribedby)):s===a?(t.preventDefault(),this.parentPopup.setExpandedState(!1),this.parentPopup.controller.focus()):[e,n].includes(a)&&(t.preventDefault(),this.parentPopup.firstItem.focus())),u)if(s===a)t.preventDefault(),d?this.updateActiveState(d):this.clearActiveState();else if([e,n].includes(a)&&!d){t.preventDefault();var p=a===e?h-1:h+1;e===a&&p<0&&(p=this.lastIndex),n===a&&this.lastIndex<p&&(p=0),this.updateActiveState(this.articleItems[p])}else if(o===a){var f=W(d||c);if(f.length>0){t.preventDefault();var m=f.indexOf(c),v=r(f,1)[0];if(d){var y=l?m-1:m+1,g=y<0||f.length-1<y?d:f[y];this.updateActiveState(g)}else l||this.updateActiveState(v)}}}}],[{key:"getItemParent",value:function(t){var e=t.dataset.childOf,n=document.getElementById(e);return null!==n&&n}},{key:"addHelpText",value:function(){[{id:"group-widget-list-help",text:U("Use up and down arrow keys to explore.","sciencenews")},{id:"group-widget-list-enter-help",text:U("Use right arrow key to move into the list.","sciencenews")},{id:"group-widget-move-back-help",text:U("Use left arrow key to move back to the parent list.","sciencenews")},{id:"group-widget-tab-help",text:U("Use tab key to enter the current list item.","sciencenews")},{id:"group-widget-esc-help",text:U("Use escape to exit the menu.","sciencenews")}].forEach(function(t){var e=t.id,n=t.text;if(null===document.body.querySelector("#".concat(e))){var i=X(e,n);document.body.appendChild(i)}})}}])}(),J=function(){return h(function t(e){var n=e.element,i=e.children,s=e.options;o(this,t),this.element=n,this.children=i,this.options=s,this.groups=[],this.articleListSupport=!1,this.setupArticleListSupport=this.setupArticleListSupport.bind(this),this.setDropdownPositioning=this.setDropdownPositioning.bind(this),this.init=this.init.bind(this),this.init(),d.lgMin.addListener(this.init)},[{key:"setupArticleListSupport",value:function(){var t=this;this.singlePopups.forEach(function(e){var n=t.options.selectors.articleList,i=e.target.querySelector(n);if(null!==i){var s=new G(i);t.groups.push(s)}e.firstItem.addEventListener("keydown",function(t){var e=H.UP,n=H.DOWN,s=t.keyCode;[e,n].includes(s)&&(t.preventDefault(),i.focus())})}),this.articleListSupport=!0}},{key:"setDropdownPositioning",value:function(){this.singlePopups.forEach(function(t){t.target.removeAttribute("style"),void 0!==t.observer&&t.observer.disconnect(),t.setExpandedState(!1);var e=t.controller.offsetLeft,n=t.controller.offsetWidth/2,i=window.innerWidth-(e+n);Object.assign(t.target.style,{right:"".concat(i,"px")}),t.observer=new MutationObserver(function(e){e.forEach(function(e){"attributes"===e.type&&"aria-hidden"===e.attributeName&&"false"===t.target.getAttribute("aria-hidden")&&(t.target.clientWidth/2<i?Object.assign(t.target.style,{transform:"translateX(50%)"}):Object.assign(t.target.style,{right:"30px"}))})}),t.observer.observe(t.target,{attributes:!0})})}},{key:"init",value:function(){if(d.lgMin.matches){if(this.topicsMenu instanceof z||(this.topicsMenu=new z(this.children.list)),void 0===this.singlePopups){var t=this.children.singleDropdownLists;null!==t&&(this.singlePopups=Array.prototype.reduce.call(t,function(t,e){return e.popup instanceof q&&t.push(e.popup),t},[]))}this.articleListSupport||this.setupArticleListSupport(),this.setDropdownPositioning(),this.resize=new $(window,"resize",this.setDropdownPositioning)}else this.resize instanceof $&&this.resize.destroy()}}],[{key:"handleTopicLeadKeydown",value:function(t,e){var n=H.UP,i=H.DOWN,s=t.keyCode;[n,i].includes(s)&&(t.preventDefault(),e.focus())}}])}(),Z=p(sciencenewsClassnames["topics-megamenu"]),Q=p(sciencenewsClassnames["dropdown-single-topic"]);e({name:"topics-menu",component:J,querySelector:{list:Z.list},querySelectorAll:{singleDropdownLists:"".concat(Q.dropdown)},options:{selectors:{articleList:Q.articleList}}});var tt=function(){return h(function t(e){o(this,t),this.stringDescription="Disclosure",Object.assign(this,{controller:null,target:null,loadOpen:!1,allowOutsideClick:!0,onOpen:function(){},onClose:function(){}},e),this.state={expanded:this.loadOpen},this.interactiveChildElements=W(this.target),this.setup=this.setup.bind(this),this.destroy=this.destroy.bind(this),this.toggleExpandedState=this.toggleExpandedState.bind(this),this.setExpandedState=this.setExpandedState.bind(this),this.rovingTabIndex=this.rovingTabIndex.bind(this),this.closeOnOutsideClick=this.closeOnOutsideClick.bind(this),this.setup(),this.rovingTabIndex(!1)},[{key:"setExpandedState",value:function(t){this.controller.setAttribute("aria-expanded","".concat(t)),this.target.setAttribute("aria-hidden","".concat(!t)),this.rovingTabIndex(t),this.state.expanded=t,t?this.onOpen.call(this):this.onClose.call(this)}},{key:Symbol.toStringTag,get:function(){return this.stringDescription}},{key:"setup",value:function(){var t=this.state.expanded;[this.controller,this.target].forEach(function(t){""===t.id&&t.setAttribute("id",V())}),this.controller.disclosure=this,this.target.disclosure=this,this.controller.setAttribute("aria-expanded","".concat(t)),this.controller.setAttribute("aria-controls",this.target.id),this.target!==this.controller.nextElementSibling&&this.controller.setAttribute("aria-owns",this.target.id),this.target.setAttribute("aria-hidden","".concat(!t)),this.controller.addEventListener("click",this.toggleExpandedState),this.allowOutsideClick||document.body.addEventListener("click",this.closeOnOutsideClick)}},{key:"destroy",value:function(){this.controller.disclosure=null,this.target.disclosure=null,this.controller.removeAttribute("aria-expanded"),this.controller.removeAttribute("aria-controls"),this.controller.removeAttribute("aria-owns"),this.target.removeAttribute("aria-hidden"),this.controller.removeEventListener("click",this.toggleExpandedState),document.body.removeEventListener("click",this.closeOnOutsideClick),this.state={expanded:this.loadOpen}}},{key:"toggleExpandedState",value:function(t){t.preventDefault(),this.state.expanded?this.setExpandedState(!1):this.setExpandedState(!0)}},{key:"closeOnOutsideClick",value:function(t){this.state.expanded&&t.target!==this.controller&&!this.target.contains(t.target)&&this.setExpandedState(!1)}},{key:"rovingTabIndex",value:function(t){this.interactiveChildElements.forEach(function(e){t?e.removeAttribute("tabindex"):e.setAttribute("tabindex","-1")})}}])}();function et(t,e){var n=t.split("-").map(function(t,e){return 0===e?t:t.charAt(0).toUpperCase()+t.slice(1)}).join(""),i=p(sciencenewsClassnames[e]);return void 0!==i[n]&&i[n]}function nt(t,e){var n=arguments.length>2&&void 0!==arguments[2]&&arguments[2],i=et(t,e);return i?n?document.querySelectorAll(i):document.querySelector(i):null}var it=function(){return h(function t(e){var n=e.element,i=e.children,s=e.options;o(this,t),this.element=n,this.children=i,this.options=s,K({"":{}},"sciencenews"),this.moveComponent=this.moveComponent.bind(this),this.updateControllerText=this.updateControllerText.bind(this),this.navBarWrapper=nt("wrapper","nav-bar"),this.navBar=nt("nav-bar","nav-bar"),this.actionsList=nt("actions","nav-bar"),this.moveComponent(),d.lgMin.addListener(this.moveComponent),this.init(),this.updateControllerText()},[{key:"moveComponent",value:function(){var t=this.children.controller;if(null!==this.navBarWrapper&&null!==this.navBar&&null!==this.actionsList){var e=t.parentElement,n=this.element.parentElement;d.lgMin.matches?e!==this.navBar&&n!==this.navBar&&this.navBar.insertBefore(this.element,this.actionsList):e!==this.navBarWrapper&&n!==this.navBarWrapper&&this.navBarWrapper.appendChild(this.element)}}},{key:"init",value:function(){var t=this,e=this.children,n=e.controller,i=e.target;this.disclosure=new tt({controller:n,target:i,onOpen:this.updateControllerText,onClose:this.updateControllerText});var s=X("header-search-help",U("Use the Shift key with the Tab key to tab back to the search input.","sciencenews"));document.body.appendChild(s),i.style.clip="rect(0, 0, 0, 0)",i.addEventListener("transitionend",function(){t.disclosure.state.expanded||(i.style.clip="rect(0, 0, 0, 0)")})}},{key:"updateControllerText",value:function(){var t=this.children,e=t.controller,n=t.target,i=t.openText,s=t.closeText,r=t.input,o=this.disclosure.state.expanded;i.setAttribute("aria-hidden","".concat(o)),s.setAttribute("aria-hidden","".concat(!o)),o?(n.style.clip="auto",e.setAttribute("aria-describedby","header-search-help"),r.focus()):e.removeAttribute("aria-describedby")}}])}(),st=p(sciencenewsClassnames["header-search"]);e({name:"header-search",component:it,querySelector:{target:st.wrapper,controller:st.toggle,openText:st.open,closeText:st.close,input:"input"}});var rt=function(){return h(function t(e){if(o(this,t),null==e||!(e instanceof HTMLFormElement))throw new Error("Invalid form element.");this.form=e,this.validateEmailInput=this.validateEmailInput.bind(this),this.formSubmit=this.formSubmit.bind(this),this.checkEmailInput=this.checkEmailInput.bind(this),this.updateState=this.updateState.bind(this),this.updateReadyState=this.updateReadyState.bind(this),this.init()},[{key:"updateState",value:function(t){var e=new CustomEvent("sn.formstatechange",{bubbles:!0,composed:!0,detail:{status:t}});this.form.dispatchEvent(e)}},{key:"updateReadyState",value:function(){Object.defineProperty(this.form,"faReadyState",{value:"ready",configurable:!0});var t=new CustomEvent("sn.formready",{bubbles:!0,composed:!0,detail:{}});this.form.dispatchEvent(t)}},{key:"init",value:function(){this.emailInput=this.form.querySelector('[name="email"]'),this.nonceInput=this.form.querySelector('[name="nonce"]'),this.submit=this.form.querySelector('[type="submit"]'),this.honeyPot=this.form.querySelector('[name="client_key"]'),this.formId=this.form.querySelector('[name="form_id"]'),this.control=this.form.querySelector('[name="control"]'),null!=this.emailInput&&(this.form.addEventListener("submit",this.formSubmit),this.emailInput.addEventListener("input",this.checkEmailInput),this.updateReadyState())}},{key:"checkEmailInput",value:function(){null!==this.emailInput.getAttribute("aria-invalid")&&this.emailInput.removeAttribute("aria-invalid")}},{key:"validateEmailInput",value:function(){var t=this.emailInput,e=t.value,n=t.pattern,i=new RegExp(n),s=e.trim();return e.trim().length>0&&i.test(s)}},{key:"formSubmit",value:function(t){var e,n=this;if(t.preventDefault(),!this.validateEmailInput())return this.emailInput.setAttribute("aria-invalid","true"),!1;var i=window.location,s=i.pathname,r=i.search,o=null!==(e=this.honeyPot)&&void 0!==e&&e.value?this.honeyPot.value:"",a=this.nonceInput.value,l=this.formId.value,c=this.control.value,h=encodeURIComponent(this.emailInput.value);this.emailInput.removeAttribute("aria-invalid"),this.updateState("loading");var u=["client_key=".concat(o),"control=".concat(c),"email=".concat(h),"form_id=".concat(l),"page=".concat(s)],d="".concat(u.join("&")).concat(r),p=new XMLHttpRequest;p.open("POST",this.form.action,!0),p.setRequestHeader("Content-Type","application/x-www-form-urlencoded; charset=UTF-8"),p.setRequestHeader("X-WP-Nonce",a),p.send(encodeURI(d)),p.onreadystatechange=function(){if(p.readyState===XMLHttpRequest.DONE){var t=p.status;0===t||t>=200&&t<400?n.updateState("success"):n.updateState("error")}}}}])}();function ot(t,e){var 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function(t,e){if("function"!=typeof e&&null!==e)throw new TypeError("Super expression must either be null or a function");t.prototype=Object.create(e&&e.prototype,{constructor:{value:t,writable:!0,configurable:!0}}),Object.defineProperty(t,"prototype",{writable:!1}),e&&dt(t,e)}(e,t),h(e,[{key:"setDialogController",value:function(t){this.controller=t,bt(e,"setSelfReference",this,3)([[this.controller]]),this.controllerIsNotAButton="BUTTON"!==this.controller.nodeName&&null===this.controller.getAttribute("role"),this.controllerIsNotAButton&&(this.controller.setAttribute("role","button"),this.controller.setAttribute("tabindex","0")),this.controller.setAttribute("aria-expanded","false"),this.controller.addEventListener("click",this.controllerClick),this.controller.addEventListener("keydown",this.controllerKeydown)}},{key:"setInteractiveChildren",value:function(){this.interactiveChildElements=function(t){const e=["a[href]","area[href]","input:not([disabled])","select:not([disabled])","textarea:not([disabled])","button:not([disabled])","iframe","object","embed","[contenteditable]",'[tabindex]:not([tabindex^="-"])'].join(","),n=t.querySelectorAll(e);return Array.prototype.slice.call(n)}(this.target);var t=r(function(t){const e=mt(t),n=e.length-1,{0:i,[n]:s}=e;return[i,s]}(this.interactiveChildElements),2),e=t[0],n=t[1];this.firstInteractiveChild=e,this.lastInteractiveChild=n}},{key:"init",value:function(){var t,n,i=this;if(0===this.content.length||null==this.content?this.content=Array.from(document.body.children).filter(function(t){return!t.contains(i.target)}):this.content=(t=this.content,Array.isArray(t)?t:t instanceof HTMLElement?new Array(t):t instanceof NodeList||t instanceof HTMLCollection?Array.from(t):[]),0===this.content.length)throw new Error("Configuration error: The Dialog target should not be within the main site 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n=0;n<e;n+=1)this.content[n].setAttribute("aria-hidden","true");this.target.setAttribute("aria-hidden","false"),this.target.removeAttribute("hidden"),null!=this.controller&&this.controller.setAttribute("aria-expanded","true"),vt(this.interactiveChildElements),this.target.focus()}else{this.target.setAttribute("tabindex","-1");for(var i=0;i<e;i+=1)this.content[i].removeAttribute("aria-hidden");this.target.setAttribute("aria-hidden","true"),this.target.setAttribute("hidden",""),yt(this.interactiveChildElements),null!=this.controller&&(this.controller.setAttribute("aria-expanded","false"),this.controller.focus())}this.onStateChange.call(this,this.state)}},{key:"hideOnOutsideClick",value:function(t){var e=this.state.expanded,n=t.target;!e||this.target.contains(n)||null==this.controller||this.controller.contains(n)||this.hide()}},{key:"handleKeydownEsc",value:function(t){ft.ESC===t.keyCode&&this.hide()}},{key:"handleTargetKeydown",value:function(t){var e=ft.TAB,n=t.keyCode,i=t.shiftKey;if(this.state.expanded&&n===e){var s=document.activeElement;i&&this.firstInteractiveChild===s?(t.preventDefault(),this.lastInteractiveChild.focus()):i||this.lastInteractiveChild!==s||(t.preventDefault(),this.firstInteractiveChild.focus())}}},{key:"controllerKeydown",value:function(t){var e=ft.SPACE,n=ft.RETURN,i=t.keyCode;[e,n].includes(i)&&(t.preventDefault(),this.show())}},{key:"controllerClick",value:function(t){t.preventDefault(),this.show()}},{key:"destroy",value:function(){this.deleteSelfReferences(),this.target.getAttribute("id").includes("id_")&&this.target.removeAttribute("id"),this.target.removeAttribute("aria-hidden"),this.target.removeAttribute("hidden"),this.target.removeAttribute("tabindex"),this.target.removeAttribute("role"),this.target.removeAttribute("aria-modal"),vt(this.interactiveChildElements);for(var t=this.content.length,e=0;e<t;e+=1)this.content[e].removeAttribute("aria-hidden");this.target.removeEventListener("keydown",this.handleTargetKeydown),null!=this.controller&&(this.controller.removeAttribute("aria-expanded"),this.controllerIsNotAButton&&(this.controller.removeAttribute("role"),this.controller.removeAttribute("tabindex")),this.controller.removeEventListener("click",this.controllerClick),this.controller.removeEventListener("keydown",this.controllerKeydown)),this.state={expanded:!1},this.onDestroy.call(this)}},{key:"show",value:function(){this.setState({expanded:!0})}},{key:"hide",value:function(){this.setState({expanded:!1})}}])}(pt);e({name:"modal-access",component:function(){return h(function t(e){var 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n=e.element,i=e.children,s=e.options;o(this,t),this.element=n,this.children=i,this.options=s;var r=this.options,a=r.menuStylesheet,l=r.persist;this.persistMenuButton=!0===l,this.primaryMenu={},this.topicsMenu={},this.topicsSubMenu={};var c=void 0!==a?a:"primary-menu",h=this.children,u=h.toggle,p=h.navBar,f=h.actions,m=nt("menu",c),v=et("has-children",c),y=m.querySelectorAll("".concat(v," > 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instanceof Y&&this.topicsMenu.destroy(),this.menuButton instanceof q&&this.menuButton.destroy(),this.removeKeydownPatches(),null!==this.topics&&this.topics.contains(document.activeElement)&&this.topicsMegaMenu.menu.firstItem.focus()):this.useHamburgerMenu()}},{key:"setUpMenuButton",value:function(){this.menuButton instanceof q?this.menuButton.setup():this.menuButton=new q({controller:this.toggle,target:this.navBar}),this.menuButton.controller.addEventListener("keydown",this.patchMenuButtonKeydown)}},{key:"setUpPrimaryMenu",value:function(){this.primaryMenu instanceof Y&&this.primaryMenu.destroy(),this.primaryMenu instanceof z?this.primaryMenu.init():this.primaryMenu=new z(this.menu)}},{key:"setUpPrimaryMenuItem",value:function(){this.primaryMenu instanceof z&&this.primaryMenu.destroy(),this.primaryMenu instanceof Y?this.primaryMenu.init():this.primaryMenu=new Y(this.menu)}},{key:"setUpSecondaryMenuItems",value:function(){null!==this.topics&&(this.topicsMenu instanceof Y?this.topicsMenu.init():this.topicsMenu=new Y(this.topics))}},{key:"setUpSecondaryMenu",value:function(){this.topicsMenu instanceof Y&&this.topicsMenu.destroy(),null!==this.topicsList&&(this.topicsSubMenu instanceof z?this.topicsSubMenu.init():this.topicsSubMenu=new z(this.topicsList))}},{key:"useHamburgerMenu",value:function(){this.setUpMenuButton(),this.setUpPrimaryMenuItem(),this.setUpSecondaryMenuItems(),this.setUpSecondaryMenu(),this.addKeydownPatches(),(this.navBar.contains(document.activeElement)||null!==this.topics&&this.topics.contains(document.activeElement))&&this.menuButton.controller.focus()}},{key:"removeKeydownPatches",value:function(){(this.primaryMenu instanceof Y||this.primaryMenu instanceof z)&&this.primaryMenu.firstItem.removeEventListener("keydown",this.patchPrimaryMenuFirstItem),this.topicsMenu instanceof Y&&this.topicsMenu.firstItem.removeEventListener("keydown",this.patchTopicsMenuFirstItem),this.menu.removeEventListener("keydown",this.patchTopLevelKeydown),null!==this.topics&&this.topics.removeEventListener("keydown",this.patchTopLevelKeydown),this.navBar.removeEventListener("keydown",this.patchNavBarKeydown)}},{key:"addKeydownPatches",value:function(){this.primaryMenu.firstItem.addEventListener("keydown",this.patchPrimaryMenuFirstItem),null!==this.topics&&this.topicsMenu.firstItem.addEventListener("keydown",this.patchTopicsMenuFirstItem),this.menu.addEventListener("keydown",this.patchTopLevelKeydown),null!==this.topics&&this.topics.addEventListener("keydown",this.patchTopLevelKeydown),this.navBar.addEventListener("keydown",this.patchNavBarKeydown)}},{key:"patchTopLevelKeydown",value:function(t){var e=t.keyCode,n=t.target;H.LEFT!==e||void 0!==n.menuItem&&void 0!==n.menuItem.previousSibling||(this.menuButton.setExpandedState(!1),this.menuButton.controller.focus())}},{key:"patchNavBarKeydown",value:function(t){var e=t.keyCode,n=H.HOME,i=H.END;n===e?(t.preventDefault(),this.menuButton.firstItem.focus()):i===e&&(t.preventDefault(),this.menuButton.lastItem.focus())}},{key:"patchTopicsMenuFirstItem",value:function(t){var e=t.keyCode,n=H.UP;H.DOWN===e&&void 0!==this.primaryMenu.firstItem?(t.preventDefault(),this.primaryMenu.firstItem.focus()):n===e&&(t.preventDefault(),this.menuButton.lastItem.focus())}},{key:"patchPrimaryMenuFirstItem",value:function(t){var e=t.keyCode;H.UP===e&&void 0!==this.topicsMenu.firstItem&&(t.preventDefault(),this.topicsMenu.firstItem.focus())}},{key:"patchMenuButtonKeydown",value:function(t){var e=t.keyCode,n=H.UP;[n,H.DOWN].includes(e)&&(t.preventDefault(),this.menuButton.state.expanded||this.menuButton.setExpandedState(!0),n===e?this.menuButton.lastItem.focus():this.menuButton.firstItem.focus())}}])}(),xt=p(sciencenewsClassnames["nav-bar"]);e({name:"nav-bar",component:kt,querySelector:{toggle:xt.toggle,navBar:xt.navBar,actions:xt.actions},querySelectorAll:{},options:{menuStylesheet:"primary-menu"}}),e({name:"newsletter-signup",component:function(){return h(function t(e){var n=e.element,i=e.children,s=e.options;o(this,t),this.element=n,this.children=i,this.options=s,this.init=this.init.bind(this),this.init()},[{key:"init",value:function(){var t=this;this.element.addEventListener("sn.formstatechange",function(e){ot(t.element,e.detail)})}}])}()}),e({name:"cookie-banner",component:function(){return h(function t(e){var 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et(t,e){return null!=t&&t instanceof e}class nt extends B{static nextElementIsUl(t){const e=t.nextElementSibling;return null!==e&&"UL"===e.nodeName&&e}constructor(t){if(super(t),this.componentName="Menu",t.menu){const{menu:e}=t;Object.assign(t,{list:e,menu:void 0}),this.warnDeprecated("config.menu","config.list")}Object.assign(this,{list:null,collapse:!1,itemMatches:"*",onInit:()=>{},onDestroy:()=>{}},t),this.setMenuItems=this.setMenuItems.bind(this),this.handleListKeydown=this.handleListKeydown.bind(this),this.destroy=this.destroy.bind(this),null!==this.list&&"UL"===this.list.nodeName&&this.init()}setMenuItems(){this.disclosures=[],this.menuItems=Array.from(this.list.children).reduce((t,e)=>{const[n,...i]=Array.from(e.children);let r=n;return null!==r&&r.matches("a,button")||([r]=Array.from(i).filter(t=>t.matches("a,button"))),void 0!==r&&r.matches(this.itemMatches)?[...t,r]:t},[]),this.search=new Y(this.menuItems),this.menuItems.forEach((t,e)=>{t.parentElement.setAttribute("role","presentation"),t.setAttribute("role","menuitem"),t.setAttribute("aria-setsize",this.menuItems.length),t.setAttribute("aria-posinset",e+1);const n=this.constructor.nextElementIsUl(t);if(n){if(this.collapse){const e=new tt({controller:t,target:n});this.disclosures.push(e)}new nt({list:n,itemMatches:this.itemMatches}).previousSibling=t}});const[t,e]=Q(this.menuItems);Object.assign(this,{firstItem:t,lastItem:e})}init(){super.setSelfReference([this.list]),this.list.setAttribute("role","menu"),this.setMenuItems(),this.list.addEventListener("keydown",this.handleListKeydown),this.onInit.call(this)}handleListKeydown(t){const{keyCode:e}=t,{UP:n,DOWN:i,LEFT:r,RIGHT:s,HOME:o,END:a,ESC:l}=z,{activeElement:c}=document,h=this.list.contains(c)?c:this.menuItems[0];switch(e){case n:case i:{const n=function(t,e,n){const{UP:i,DOWN:r}=z;return function(t,e,n,i){const{next:r,previous:s}=i,o=n.indexOf(e),a=n.length-1;let l=t===s?o-1:o+1;return s===t&&0>l&&(l=a),r===t&&a<l&&(l=0),n[l]}(t,e,n,{previous:i,next:r})}(e,h,this.menuItems);n&&(t.stopPropagation(),t.preventDefault(),n.focus());break}case o:t.preventDefault(),this.firstItem.focus();break;case a:t.preventDefault(),this.lastItem.focus();break;case s:{const e=this.constructor.nextElementIsUl(h);if(e&&et(e.menu,nt)){t.stopPropagation(),t.preventDefault(),et(h.disclosure,tt)&&h.disclosure.open();const{menu:n}=e;n.firstItem.focus()}break}case r:void 0===this.previousSibling||this.previousSibling.hasAttribute("aria-haspopup")||(t.preventDefault(),t.stopPropagation(),et(this.previousSibling.disclosure,tt)&&this.previousSibling.disclosure.close(),this.previousSibling.focus());break;case l:break;default:{t.stopPropagation();const n=this.search.getItem(e);null!==n&&n.focus();break}}}destroy(){this.deleteSelfReferences(),this.list.removeAttribute("role"),this.list.removeEventListener("keydown",this.handleListKeydown),this.menuItems.forEach(t=>{t.parentElement.removeAttribute("role"),t.removeAttribute("role"),t.removeAttribute("aria-setsize"),t.removeAttribute("aria-posinset");const e=this.constructor.nextElementIsUl(t);e&&et(e.menu,nt)&&e.menu.destroy()}),this.disclosures.forEach(t=>{t.destroy()}),this.onDestroy.call(this)}}class it extends B{constructor(t){super(t),this.componentName="MenuButton",Object.assign(this,{controller:null,target:null,list:null,onInit:()=>{},onStateChange:()=>{},onDestroy:()=>{}},t),this.handleControllerKeydown=this.handleControllerKeydown.bind(this),this.onPopupStateChange=this.onPopupStateChange.bind(this),this.show=this.show.bind(this),this.hide=this.hide.bind(this),this.destroy=this.destroy.bind(this),null!==this.controller&&null!==this.target&&this.init()}init(){this.popup=new V({controller:this.controller,target:this.target,type:"menu",onStateChange:this.onPopupStateChange}),null!==this.list&&"UL"===this.list.nodeName?this.menu=new nt({list:this.list}):"UL"===this.target.nodeName&&(this.menu=new nt({list:this.target})),this.controller.addEventListener("keydown",this.handleControllerKeydown),this.state={expanded:!1},this.onInit.call(this)}onPopupStateChange(t){this.setState(t),this.onStateChange.call(this,this.state)}handleControllerKeydown(t){const{keyCode:e}=t,{RETURN:n,UP:i,DOWN:r,SPACE:s}=z;switch(e){case n:case s:case r:t.preventDefault(),this.show(),this.menu.firstItem&&this.menu.firstItem.focus();break;case i:t.preventDefault(),this.show(),this.menu.lastItem&&this.menu.lastItem.focus()}}destroy(){this.popup.destroy(),this.menu.destroy(),this.controller.removeEventListener("keydown",this.handleControllerKeydown),this.onDestroy.call(this)}show(){this.popup.show()}hide(){this.popup.hide()}}var rt=function(){return h(function t(e){var n=e.element,i=e.children,r=e.options;l(this,t),this.element=n,this.children=i,this.options=r,this.init=this.init.bind(this),this.onMenuSelect=this.onMenuSelect.bind(this),this.handleJumpMenuClick=this.handleJumpMenuClick.bind(this),this.handleJumpMenuKeydown=this.handleJumpMenuKeydown.bind(this),this.init()},[{key:"handleJumpMenuKeydown",value:function(t){z.RETURN===t.keyCode&&"A"===t.target.nodeName&&(t.preventDefault(),this.onMenuSelect(t.target))}},{key:"handleJumpMenuClick",value:function(t){"A"===t.target.nodeName&&(t.preventDefault(),this.onMenuSelect(t.target))}},{key:"onMenuSelect",value:function(t){var e=t.hash,n=window.history.state,i=new URL(window.location);i.hash=e,window.location.href=i.href,window.history.replaceState(n,"",i),this.menuButton.hide()}},{key:"init",value:function(){var t=this.children,e=t.controller,n=t.target;this.menuButton=new it({controller:e,target:n}),n.addEventListener("click",this.handleJumpMenuClick),n.addEventListener("keydown",this.handleJumpMenuKeydown)}}])}(),st=u(sciencenewsClassnames["milestones-jump-to-decade"]);e({name:"milestones-jump-to-decade",component:rt,querySelector:{controller:st.controller,target:st.target}})})()})();
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