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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=F(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",function(){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)}())}),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 H(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 W(t,e){var n=arguments.length>2&&void 0!==arguments[2]&&arguments[2],i=H(t,e);return i?n?document.querySelectorAll(i):document.querySelector(i):null}var q=function(){return c(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,j({"":{}},"sciencenews"),this.moveComponent=this.moveComponent.bind(this),this.updateControllerText=this.updateControllerText.bind(this),this.navBarWrapper=W("wrapper","nav-bar"),this.navBar=W("nav-bar","nav-bar"),this.actionsList=W("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 R({controller:n,target:i,onOpen:this.updateControllerText,onClose:this.updateControllerText});var s,r,o=(s=N("Use the Shift key with the Tab key to tab back to the search input.","sciencenews"),(r=document.createElement("span")).classList.add("screen-reader-text"),Object.assign(r,{id:"header-search-help",innerText:s}),r);document.body.appendChild(o),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")}}])}(),z=p(sciencenewsClassnames["header-search"]);e({name:"header-search",component:q,querySelector:{target:z.wrapper,controller:z.toggle,openText:z.open,closeText:z.close,input:"input"}});var $=function(){return c(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,h=this.control.value,c=encodeURIComponent(this.emailInput.value);this.emailInput.removeAttribute("aria-invalid"),this.updateState("loading");var u=["client_key=".concat(o),"control=".concat(h),"email=".concat(c),"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 G(t){for(var e=1;e<arguments.length;e++){var n=arguments[e];for(var i in n)t[i]=n[i]}return t}e({name:"form-assembly",component:function(){return c(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(){this.formAssemblySubmit=new $(this.element)}}])}()}),e({name:"snc-signup",component:function(){return c(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){var n,i,s,r;n=t.element,i=e.detail,s=i.status,r={loading:"login-form--loading",success:"login-form--success",error:"login-form--error"},requestAnimationFrame(function(){"loading"===s?n.classList.remove(r.success,r.error):n.classList.remove(r.loading),n.classList.add(r[s])})})}}])}()});var Y=function t(e,n){function i(t,i,s){if("undefined"!=typeof document){"number"==typeof(s=G({},n,s)).expires&&(s.expires=new Date(Date.now()+864e5*s.expires)),s.expires&&(s.expires=s.expires.toUTCString()),t=encodeURIComponent(t).replace(/%(2[346B]|5E|60|7C)/g,decodeURIComponent).replace(/[()]/g,escape);var r="";for(var o in s)s[o]&&(r+="; "+o,!0!==s[o]&&(r+="="+s[o].split(";")[0]));return document.cookie=t+"="+e.write(i,t)+r}}return Object.create({set:i,get:function(t){if("undefined"!=typeof document&&(!arguments.length||t)){for(var n=document.cookie?document.cookie.split("; "):[],i={},s=0;s<n.length;s++){var r=n[s].split("="),o=r.slice(1).join("=");try{var a=decodeURIComponent(r[0]);if(i[a]=e.read(o,a),t===a)break}catch(t){}}return t?i[t]:i}},remove:function(t,e){i(t,"",G({},e,{expires:-1}))},withAttributes:function(e){return t(this.converter,G({},this.attributes,e))},withConverter:function(e){return t(G({},this.converter,e),this.attributes)}},{attributes:{value:Object.freeze(n)},converter:{value:Object.freeze(e)}})}({read:function(t){return'"'===t[0]&&(t=t.slice(1,-1)),t.replace(/(%[\dA-F]{2})+/gi,decodeURIComponent)},write:function(t){return encodeURIComponent(t).replace(/%(2[346BF]|3[AC-F]|40|5[BDE]|60|7[BCD])/g,decodeURIComponent)}},{path:"/"});e({name:"cookie-banner",component:function(){return c(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.handleButtonClick=this.handleButtonClick.bind(this);var r=amScripts.global.sitePrefix,a="snhs"===r?"sn":r;this.cookieName="".concat(a,"-cookies-accepted"),"true"!==Y.get(this.cookieName)&&this.init()},[{key:"handleButtonClick",value:function(){Y.set(this.cookieName,!0,{expires:365}),this.element.setAttribute("hidden",""),this.element.setAttribute("aria-hidden","true")}},{key:"init",value:function(){var t=this.children.button;this.element.removeAttribute("hidden"),this.element.removeAttribute("aria-hidden"),t.addEventListener("click",this.handleButtonClick)}}])}(),querySelector:{button:p(sciencenewsClassnames["cookie-banner"]).button}});const X=Object.freeze({TAB:9,RETURN:13,ESC:27,SPACE:32,END:35,HOME:36,LEFT:37,UP:38,RIGHT:39,DOWN:40});var Z=function(){return c(function t(e){if(o(this,t),this.stringDescription="Popup",Object.assign(this,e),this.interactiveChildElements=F(this.target),this.interactiveChildElements.length>0){var 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=X.ESC,n=X.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=X.ESC,n=X.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){X.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)}}])}();function J(t){return function(t){if(Array.isArray(t))return i(t)}(t)||function(t){if("undefined"!=typeof Symbol&&null!=t[Symbol.iterator]||null!=t["@@iterator"])return Array.from(t)}(t)||s(t)||function(){throw new TypeError("Invalid attempt to spread non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method.")}()}var Q=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 c(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(J(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=X.UP,i=X.DOWN,s=X.LEFT,r=X.RIGHT,o=document.activeElement,a=this.list.contains(o)?o:this.menuItems[0],l=this.menuItems.length-1,h=this.menuItems.indexOf(a);if([n,i].includes(e)){t.stopPropagation(),t.preventDefault();var c=e===n?h-1:h+1;n===e&&c<0&&(c=l),i===e&&l<c&&(c=0),this.menuItems[c].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}}])}(),V=function(){return c(function t(e){o(this,t),this.stringDescription="Menu",this.menu=e,this.popups=[],j({"":{}},"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(J(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 Z({controller:n,target:i});return i.addEventListener("keydown",t.handleListKeydown),new Q(i).previousSibling=n,[].concat(J(e),[s])}return e},[])}},{key:"handleMenuBarKeydown",value:function(t){var e=X.LEFT,n=X.RIGHT,i=X.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 h=r.popup;h.state.expanded||h.setExpandedState(!0),h.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()})}}])}(),tt=function(){return c(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;var r=this.options,a=r.menuStylesheet,l=r.persist;this.persistMenuButton=!0===l,this.primaryMenu={},this.topicsMenu={},this.topicsSubMenu={};var h=void 0!==a?a:"primary-menu",c=this.children,u=c.toggle,p=c.navBar,m=c.actions,f=W("menu",h),v=H("has-children",h),y=f.querySelectorAll("".concat(v," > a")),b=W("topics-menu",h),g=W("topics-menu__list",h),w=W("list","topics-megamenu");Object.assign(this,{toggle:u,navBar:p,menu:f,topics:b,topicsList:g,actions:m,topicsMegaMenu:w,submenuLinks:y,menuButton:{}}),this.handleBreakpointChanges=this.handleBreakpointChanges.bind(this),this.setUpMenuButton=this.setUpMenuButton.bind(this),this.useHamburgerMenu=this.useHamburgerMenu.bind(this),this.setUpPrimaryMenu=this.setUpPrimaryMenu.bind(this),this.setUpPrimaryMenuItem=this.setUpPrimaryMenuItem.bind(this),this.setUpSecondaryMenuItems=this.setUpSecondaryMenuItems.bind(this),this.setUpSecondaryMenu=this.setUpSecondaryMenu.bind(this),this.addKeydownPatches=this.addKeydownPatches.bind(this),this.removeKeydownPatches=this.removeKeydownPatches.bind(this),this.patchTopLevelKeydown=this.patchTopLevelKeydown.bind(this),this.patchNavBarKeydown=this.patchNavBarKeydown.bind(this),this.patchMenuButtonKeydown=this.patchMenuButtonKeydown.bind(this),this.patchPrimaryMenuFirstItem=this.patchPrimaryMenuFirstItem.bind(this),this.patchTopicsMenuFirstItem=this.patchTopicsMenuFirstItem.bind(this),this.persistMenuButton?this.useHamburgerMenu():(this.handleBreakpointChanges(),d.lgMin.addListener(this.handleBreakpointChanges))},[{key:"handleBreakpointChanges",value:function(){d.lgMin.matches?(this.setUpPrimaryMenu(),this.topicsMenu instanceof Q&&this.topicsMenu.destroy(),this.menuButton instanceof Z&&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 Z?this.menuButton.setup():this.menuButton=new Z({controller:this.toggle,target:this.navBar}),this.menuButton.controller.addEventListener("keydown",this.patchMenuButtonKeydown)}},{key:"setUpPrimaryMenu",value:function(){this.primaryMenu instanceof Q&&this.primaryMenu.destroy(),this.primaryMenu instanceof V?this.primaryMenu.init():this.primaryMenu=new V(this.menu)}},{key:"setUpPrimaryMenuItem",value:function(){this.primaryMenu instanceof V&&this.primaryMenu.destroy(),this.primaryMenu instanceof Q?this.primaryMenu.init():this.primaryMenu=new Q(this.menu)}},{key:"setUpSecondaryMenuItems",value:function(){null!==this.topics&&(this.topicsMenu instanceof Q?this.topicsMenu.init():this.topicsMenu=new Q(this.topics))}},{key:"setUpSecondaryMenu",value:function(){this.topicsMenu instanceof Q&&this.topicsMenu.destroy(),null!==this.topicsList&&(this.topicsSubMenu instanceof V?this.topicsSubMenu.init():this.topicsSubMenu=new V(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 Q||this.primaryMenu instanceof V)&&this.primaryMenu.firstItem.removeEventListener("keydown",this.patchPrimaryMenuFirstItem),this.topicsMenu instanceof Q&&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;X.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=X.HOME,i=X.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=X.UP;X.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;X.UP===e&&void 0!==this.topicsMenu.firstItem&&(t.preventDefault(),this.topicsMenu.firstItem.focus())}},{key:"patchMenuButtonKeydown",value:function(t){var e=t.keyCode,n=X.UP;[n,X.DOWN].includes(e)&&(t.preventDefault(),this.menuButton.state.expanded||this.menuButton.setExpandedState(!0),n===e?this.menuButton.lastItem.focus():this.menuButton.firstItem.focus())}}])}(),et=p(sciencenewsClassnames["nav-bar-collapsed"]);e({name:"nav-bar-collapsed",component:tt,querySelector:{toggle:et.toggle,navBar:et.navBar,actions:et.actions},querySelectorAll:{},options:{menuStylesheet:"primary-menu-collapsed",persist:!0}});var nt=function(){return c(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)}}])}(),it=function(){return c(function t(e){o(this,t),this.init=this.init.bind(this),this.handleResize=this.handleResize.bind(this),this.destroy=this.destroy.bind(this),0===Object.keys(e).filter(function(t){return!e[t]}).length&&(Object.assign(this,{wrapper:null,menu:null,button:null,overflow:null,onOverflowUpdate:function(){}},e),this.init())},[{key:"init",value:function(){this.breakWidths=[],this.overflowWrapper=this.button.parentElement,this.overflow.setAttribute("hidden",""),this.handleResize(),this.resize=new nt(window,"resize",this.handleResize)}},{key:"handleResize",value:function(){var t=this.overflowWrapper.hasAttribute("hidden")?this.wrapper.offsetWidth:this.wrapper.offsetWidth-this.button.offsetWidth;if(this.menu.offsetWidth>t){var e=this.overflowWrapper.previousElementSibling;null!==e&&(this.breakWidths.push(this.menu.offsetWidth),this.overflow.insertBefore(e,this.overflow.firstElementChild),this.overflowWrapper.removeAttribute("hidden"))}else t>this.breakWidths[this.breakWidths.length-1]&&(this.menu.insertBefore(this.overflow.firstElementChild,this.overflowWrapper),this.breakWidths.pop()),0!==this.breakWidths.length&&null!==this.overflow.firstElementChild||this.overflowWrapper.setAttribute("hidden","");this.menu.offsetWidth>t?this.handleResize():this.onOverflowUpdate.call(this,this.overflow.children.length)}},{key:"destroy",value:function(){var t=this;this.breakWidths=[],this.resize instanceof nt&&this.resize.destroy(),this.overflowWrapper.setAttribute("hidden",""),Array.from(this.overflow.children).forEach(function(e){t.menu.insertBefore(e,t.overflowWrapper)})}}])}();class st{constructor(){this.state={},this.searchString="",this.referenceElements=[],this.setState=this.setState.bind(this),this.getState=this.getState.bind(this),this.setSelfReference=this.setSelfReference.bind(this),this.warnDeprecated=this.warnDeprecated.bind(this)}setState(t){Object.assign(this.state,t),"function"==typeof this.stateWasUpdated&&this.stateWasUpdated()}setSelfReference(t){const e=[...t].map(t=>(Object.defineProperty(t,this.componentName.toLowerCase(),{value:this,configurable:!0}),t));this.referenceElements=[...this.referenceElements,...e]}deleteSelfReferences(){this.referenceElements.forEach(t=>{delete t[this.componentName.toLowerCase()]})}getState(){return this.state}warnDeprecated(t,e=!1){const n=e?`Use ${e} instead.`:"";console.warn(`${this.componentName}:`,`${t} is deprecated.`,`${n}`)}}const rt=Object.freeze({TAB:9,RETURN:13,ESC:27,SPACE:32,END:35,HOME:36,LEFT:37,UP:38,RIGHT:39,DOWN:40}),ot=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)};function at(t){if(Array.isArray(t))return t;let e=[];return t instanceof HTMLElement?e=new Array(t):(t instanceof NodeList||t instanceof HTMLCollection)&&(e=Array.prototype.slice.call(t,0)),e}function lt(t){(Array.isArray(t)?t:at(t)).forEach(t=>{t.removeAttribute("tabindex")})}function ht(t){(Array.isArray(t)?t:at(t)).forEach(t=>{t.setAttribute("tabindex","-1")})}function ct(t,e){const n=Array.isArray(e)?e:at(e),i=Array.isArray(t)?t:at(t);lt(n),0<i.length&&ht(i.filter(t=>!n.includes(t)))}function ut(t){null!==t&&""===t.id&&t.setAttribute("id",function(t=36){const[,e]=Math.random().toString(t).split(".");return`id_${e}`}())}function dt(t){const e=at(t),n=e.length-1,{0:i,[n]:s}=e;return[i,s]}class pt extends st{constructor(t){super(t),this.componentName="Popup",Object.assign(this,{controller:null,target:null,type:"true",onInit:()=>{},onStateChange:()=>{},onDestroy:()=>{}},t),this.state={expanded:!1},this.init=this.init.bind(this),this.setInteractiveChildren=this.setInteractiveChildren.bind(this),this.stateWasUpdated=this.stateWasUpdated.bind(this),this.hide=this.hide.bind(this),this.show=this.show.bind(this),this.controllerClickHandler=this.controllerClickHandler.bind(this),this.controllerKeyDownHandler=this.controllerKeyDownHandler.bind(this),this.targetKeyDownHandler=this.targetKeyDownHandler.bind(this),this.hideOnTabOut=this.hideOnTabOut.bind(this),this.hideOnOutsideClick=this.hideOnOutsideClick.bind(this),this.destroy=this.destroy.bind(this),this.controllerIsNotAButton="BUTTON"!==this.controller.nodeName&&null===this.controller.getAttribute("role"),null!==this.controller&&null!==this.target&&this.init()}setInteractiveChildren(){const{expanded:t}=this.state;if(this.interactiveChildElements=ot(this.target),t?lt(this.interactiveChildElements):ht(this.interactiveChildElements),0<this.interactiveChildElements.length){const[t,e]=dt(this.interactiveChildElements);Object.assign(this,{firstInteractiveChild:t,lastInteractiveChild:e})}}init(){super.setSelfReference([this.controller,this.target]),this.setInteractiveChildren(),ut(this.target),this.controller.setAttribute("aria-haspopup",this.type),this.controller.setAttribute("aria-expanded","false"),this.controller.setAttribute("aria-controls",this.target.id),ut(this.controller),this.controllerIsNotAButton&&(this.controller.setAttribute("role","button"),this.controller.setAttribute("tabindex","0")),this.target!==this.controller.nextElementSibling&&this.controller.setAttribute("aria-owns",this.target.id),this.target.setAttribute("aria-hidden","true"),this.target.setAttribute("hidden",""),this.controller.addEventListener("click",this.controllerClickHandler),this.controller.addEventListener("keydown",this.controllerKeyDownHandler),this.target.addEventListener("keydown",this.targetKeyDownHandler),document.body.addEventListener("click",this.hideOnOutsideClick),this.onInit.call(this)}stateWasUpdated(){const{expanded:t}=this.state;this.controller.setAttribute("aria-expanded",`${t}`),t?(this.target.setAttribute("aria-hidden","false"),this.target.removeAttribute("hidden"),lt(this.interactiveChildElements)):(this.target.setAttribute("aria-hidden","true"),this.target.setAttribute("hidden",""),ht(this.interactiveChildElements)),this.onStateChange.call(this,this.state)}controllerKeyDownHandler(t){const{expanded:e}=this.state,{ESC:n,TAB:i,SPACE:s,RETURN:r}=rt,{keyCode:o}=t;[s,r].includes(o)?this.controllerClickHandler(t):e&&(n===o?(t.preventDefault(),this.hide()):i===o&&(t.preventDefault(),this.firstInteractiveChild.focus()))}targetKeyDownHandler(t){const{ESC:e,TAB:n}=rt,{keyCode:i,shiftKey:s}=t,{expanded:r}=this.state,{activeElement:o}=document;e===i&&r?(t.preventDefault(),this.hide(),this.controller.focus()):n===i&&(s?[this.firstInteractiveChild,this.target].includes(o)&&(t.preventDefault(),this.controller.focus()):this.lastInteractiveChild===o&&this.hide())}controllerClickHandler(t){t.preventDefault();const{expanded:e}=this.state;this.setState({expanded:!e})}hideOnTabOut(t){const{expanded:e}=this.state,{TAB:n}=rt,{keyCode:i,shiftKey:s}=t;n===i&&!s&&e&&this.hide()}hideOnOutsideClick(t){const{expanded:e}=this.state,{target:n}=t;e&&n!==this.controller&&!this.target.contains(n)&&this.hide()}destroy(){this.deleteSelfReferences(),[this.controller,this.target].forEach(t=>{t.getAttribute("id").includes("id_")&&t.removeAttribute("id")}),this.controller.removeAttribute("aria-haspopup"),this.controller.removeAttribute("aria-expanded"),this.controller.removeAttribute("aria-controls"),this.controller.removeAttribute("aria-owns"),this.controllerIsNotAButton&&(this.controller.removeAttribute("role"),this.controller.removeAttribute("tabindex")),this.target.removeAttribute("aria-hidden"),this.target.removeAttribute("hidden"),lt(this.interactiveChildElements),this.controller.removeEventListener("click",this.controllerClickHandler),this.controller.removeEventListener("keydown",this.controllerKeyDownHandler),this.target.removeEventListener("keydown",this.targetKeyDownHandler),document.body.removeEventListener("click",this.hideOnOutsideClick),this.state={expanded:!1},this.onDestroy.call(this)}show(){this.setState({expanded:!0})}hide(){this.setState({expanded:!1})}}class mt{constructor(t){switch(this.searchString="",this.clearSearch=null,!0){case Array.isArray(t):this.items=t;break;case t instanceof NodeList:this.items=Array.prototype.slice.call(t,0);break;case null!==t&&"UL"===t.nodeName:this.items=Array.prototype.slice.call(t.children,0);break;default:this.items=null}}getItem(t){if(null!==this.items){const e=String.fromCharCode(t);this.searchString+=e,null!==this.clearSearch&&(clearTimeout(this.clearSearch),this.clearSearch=null),this.clearSearch=setTimeout(()=>{this.searchString="",this.clearSearch=null},500);const n=this.items.filter(t=>0===t.textContent.toLowerCase().indexOf(this.searchString.toLowerCase()));return n.length?n[0]:null}return null}}class ft extends st{constructor(t){super(t),this.componentName="Disclosure",Object.assign(this,{controller:null,target:null,loadOpen:!1,allowOutsideClick:!0,onInit:()=>{},onStateChange:()=>{},onDestroy:()=>{}},t),this.state={expanded:this.loadOpen},this.setInteractiveChildren=this.setInteractiveChildren.bind(this),this.init=this.init.bind(this),this.destroy=this.destroy.bind(this),this.open=this.open.bind(this),this.close=this.close.bind(this),this.handleControllerKeydown=this.handleControllerKeydown.bind(this),this.toggleExpandedState=this.toggleExpandedState.bind(this),this.closeOnOutsideClick=this.closeOnOutsideClick.bind(this),this.stateWasUpdated=this.stateWasUpdated.bind(this),null!==this.controller&&null!==this.target&&this.init()}setInteractiveChildren(){const{expanded:t}=this.state;this.interactiveChildElements=ot(this.target),t?lt(this.interactiveChildElements):ht(this.interactiveChildElements)}init(){super.setSelfReference([this.controller,this.target]);const{expanded:t}=this.state;[this.controller,this.target].forEach(t=>{ut(t)}),this.controller.setAttribute("aria-expanded",`${t}`),this.controller.setAttribute("aria-controls",this.target.id),"BUTTON"!==this.controller.nodeName&&(this.controller.setAttribute("role","button"),"A"!==this.controller.nodeName&&null===this.controller.getAttribute("tabindex")&&this.controller.setAttribute("tabindex","0")),this.target!==this.controller.nextElementSibling&&this.controller.setAttribute("aria-owns",this.target.id),t||(this.target.setAttribute("aria-hidden","true"),this.target.setAttribute("hidden","")),this.controller.addEventListener("click",this.toggleExpandedState),this.controller.addEventListener("keydown",this.handleControllerKeydown),this.allowOutsideClick||document.body.addEventListener("click",this.closeOnOutsideClick),this.setInteractiveChildren(),this.onInit.call(this)}stateWasUpdated(){const{expanded:t}=this.state;this.controller.setAttribute("aria-expanded",`${t}`),t?(this.target.setAttribute("aria-hidden","false"),this.target.removeAttribute("hidden")):(this.target.setAttribute("aria-hidden","true"),this.target.setAttribute("hidden","")),t?lt(this.interactiveChildElements):ht(this.interactiveChildElements),this.onStateChange.call(this,this.state)}handleControllerKeydown(t){const{SPACE:e,RETURN:n}=rt,{keyCode:i}=t;[e,n].includes(i)&&this.toggleExpandedState(t)}toggleExpandedState(t){t.preventDefault(),this.state.expanded?this.close():this.open()}closeOnOutsideClick(t){this.state.expanded&&t.target!==this.controller&&!this.target.contains(t.target)&&this.close()}destroy(){this.deleteSelfReferences(),[this.controller,this.target].forEach(t=>{t.getAttribute("id").includes("id_")&&t.removeAttribute("id")}),this.controller.removeAttribute("aria-expanded"),this.controller.removeAttribute("aria-controls"),this.controller.removeAttribute("aria-owns"),this.controller.removeAttribute("tabindex"),"BUTTON"!==this.controller.nodeName&&this.controller.removeAttribute("role"),this.target.removeAttribute("aria-hidden"),this.target.removeAttribute("hidden"),lt(this.interactiveChildElements),this.controller.removeEventListener("click",this.toggleExpandedState),this.controller.removeEventListener("keydown",this.handleControllerKeydown),document.body.removeEventListener("click",this.closeOnOutsideClick),this.state={expanded:this.loadOpen},this.onDestroy.call(this)}open(){this.setState({expanded:!0})}close(){this.setState({expanded:!1})}}function vt(t,e){return null!=t&&t instanceof e}function yt(t,e,n,i){const{next:s,previous:r}=i,o=n.indexOf(e),a=n.length-1;let l=t===r?o-1:o+1;return r===t&&0>l&&(l=a),s===t&&a<l&&(l=0),n[l]}class bt extends st{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 s=n;return null!==s&&s.matches("a,button")||([s]=Array.from(i).filter(t=>t.matches("a,button"))),void 0!==s&&s.matches(this.itemMatches)?[...t,s]:t},[]),this.search=new mt(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 ft({controller:t,target:n});this.disclosures.push(e)}new bt({list:n,itemMatches:this.itemMatches}).previousSibling=t}});const[t,e]=dt(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:s,RIGHT:r,HOME:o,END:a,ESC:l}=rt,{activeElement:h}=document,c=this.list.contains(h)?h:this.menuItems[0];switch(e){case n:case i:{const n=function(t,e,n){const{UP:i,DOWN:s}=rt;return yt(t,e,n,{previous:i,next:s})}(e,c,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 r:{const e=this.constructor.nextElementIsUl(c);if(e&&vt(e.menu,bt)){t.stopPropagation(),t.preventDefault(),vt(c.disclosure,ft)&&c.disclosure.open();const{menu:n}=e;n.firstItem.focus()}break}case s:void 0===this.previousSibling||this.previousSibling.hasAttribute("aria-haspopup")||(t.preventDefault(),t.stopPropagation(),vt(this.previousSibling.disclosure,ft)&&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&&vt(e.menu,bt)&&e.menu.destroy()}),this.disclosures.forEach(t=>{t.destroy()}),this.onDestroy.call(this)}}class gt extends st{static getPopupFromMenubarItem(t){return!!vt(t.popup,pt)&&t.popup}constructor(t){super(t),this.componentName="MenuBar",Object.keys(t).forEach(e=>{if("menu"===e){const{menu:e}=t;Object.assign(t,{list:e,menu:void 0}),this.warnDeprecated("config.menu","config.list")}["onPopupDestroy","onPopupStateChange"].includes(e)&&this.warnDeprecated(`config.${e}`)}),Object.assign(this,{list:null,itemMatches:"*",onInit:()=>{},onStateChange:()=>{},onDestroy:()=>{},onPopupInit:()=>{}},t),this.setMenuBarItems=this.setMenuBarItems.bind(this),this.setMenuBarSubMenuItems=this.setMenuBarSubMenuItems.bind(this),this.handleMenuBarKeydown=this.handleMenuBarKeydown.bind(this),this.handleMenuBarClick=this.handleMenuBarClick.bind(this),this.handleMenuItemKeydown=this.handleMenuItemKeydown.bind(this),this.stateWasUpdated=this.stateWasUpdated.bind(this),this.onPopupStateChange=this.onPopupStateChange.bind(this),this.destroy=this.destroy.bind(this),null!==this.list&&"UL"===this.list.nodeName&&this.init()}setMenuBarItems(){this.menuBarItems=Array.from(this.list.children).reduce((t,e)=>{const[n,...i]=Array.from(e.children);let s=n;return null!==s&&s.matches("a,button")||([s]=Array.from(i).filter(t=>t.matches("a,button"))),void 0!==s&&s.matches(this.itemMatches)?[...t,s]:t},[]),this.search=new mt(this.menuBarItems),this.menuBarItems.forEach((t,e)=>{t.setAttribute("role","menuitem"),t.setAttribute("aria-setsize",this.menuBarItems.length),t.setAttribute("aria-posinset",e+1),t.parentElement.setAttribute("role","presentation"),t.parentElement.addEventListener("keydown",this.handleMenuBarKeydown),t.addEventListener("click",this.handleMenuBarClick)});const[t,e]=dt(this.menuBarItems);Object.assign(this,{firstItem:t,lastItem:e});const n=this.menuBarItems.includes(document.activeElement)?document.activeElement:this.firstItem;ct(this.menuBarItems,n)}setMenuBarSubMenuItems(){const{popups:t,subMenus:e}=this.menuBarItems.reduce((t,e)=>{const n=e.nextElementSibling;if(null===n)return t;const i=new pt({controller:e,target:n,onInit:this.onPopupInit,onStateChange:this.onPopupStateChange,type:"menu"});t.popups.push(i);const s="UL"===n.nodeName?n:n.querySelector("ul");if(null===s)return t;const r=new bt({list:s,itemMatches:this.itemMatches});return n.addEventListener("keydown",this.handleMenuItemKeydown),r.previousSibling=e,t.subMenus.push(r),t},{popups:[],subMenus:[]});Object.assign(this,{popups:t,subMenus:e})}init(){super.setSelfReference([this.list]),this.list.setAttribute("role","menubar"),this.setMenuBarItems(),this.clickEvent=new 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