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Editing: wp-polyfill-inert.min.js
!function(e){("object"!=typeof exports||"undefined"==typeof module)&&"function"==typeof define&&define.amd?define("inert",e):e()}(function(){"use strict";var o,r,t,i,s,n,e=function(e,t,n){return t&&a(e.prototype,t),n&&a(e,n),e};function a(e,t){for(var n=0;n<t.length;n++){var i=t[n];i.enumerable=i.enumerable||!1,i.configurable=!0,"value"in i&&(i.writable=!0),Object.defineProperty(e,i.key,i)}}function d(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}function u(e,t){d(this,u),this._inertManager=t,this._rootElement=e,this._managedNodes=new Set,this._rootElement.hasAttribute("aria-hidden")?this._savedAriaHidden=this._rootElement.getAttribute("aria-hidden"):this._savedAriaHidden=null,this._rootElement.setAttribute("aria-hidden","true"),this._makeSubtreeUnfocusable(this._rootElement),this._observer=new MutationObserver(this._onMutation.bind(this)),this._observer.observe(this._rootElement,{attributes:!0,childList:!0,subtree:!0})}function h(e,t){d(this,h),this._node=e,this._overrodeFocusMethod=!1,this._inertRoots=new Set([t]),this._savedTabIndex=null,this._destroyed=!1,this.ensureUntabbable()}function l(e){if(d(this,l),!e)throw new Error("Missing required argument; InertManager needs to wrap a document.");this._document=e,this._managedNodes=new Map,this._inertRoots=new Map,this._observer=new MutationObserver(this._watchForInert.bind(this)),_(e.head||e.body||e.documentElement),"loading"===e.readyState?e.addEventListener("DOMContentLoaded",this._onDocumentLoaded.bind(this)):this._onDocumentLoaded()}function c(e,t,n){if(e.nodeType==Node.ELEMENT_NODE){var i=e,o=(t&&t(i),i.shadowRoot);if(o)return void c(o,t,o);if("content"==i.localName){for(var o=i,r=o.getDistributedNodes?o.getDistributedNodes():[],s=0;s<r.length;s++)c(r[s],t,n);return}if("slot"==i.localName){for(var o=i,a=o.assignedNodes?o.assignedNodes({flatten:!0}):[],d=0;d<a.length;d++)c(a[d],t,n);return}}for(var u=e.firstChild;null!=u;)c(u,t,n),u=u.nextSibling}function _(e){var t;e.querySelector("style#inert-style, link#inert-style")||((t=document.createElement("style")).setAttribute("id","inert-style"),t.textContent="\n[inert] {\n pointer-events: none;\n cursor: default;\n}\n\n[inert], [inert] * {\n -webkit-user-select: none;\n -moz-user-select: none;\n -ms-user-select: none;\n user-select: none;\n}\n",e.appendChild(t))}"undefined"!=typeof window&&"undefined"!=typeof Element&&(o=Array.prototype.slice,r=Element.prototype.matches||Element.prototype.msMatchesSelector,t=["a[href]","area[href]","input:not([disabled])","select:not([disabled])","textarea:not([disabled])","button:not([disabled])","details","summary","iframe","object","embed","video","[contenteditable]"].join(","),e(u,[{key:"destructor",value:function(){this._observer.disconnect(),this._rootElement&&(null!==this._savedAriaHidden?this._rootElement.setAttribute("aria-hidden",this._savedAriaHidden):this._rootElement.removeAttribute("aria-hidden")),this._managedNodes.forEach(function(e){this._unmanageNode(e.node)},this),this._observer=null,this._rootElement=null,this._managedNodes=null,this._inertManager=null}},{key:"_makeSubtreeUnfocusable",value:function(e){var t=this,n=(c(e,function(e){return t._visitNode(e)}),document.activeElement);if(!document.body.contains(e)){for(var i=e,o=void 0;i;){if(i.nodeType===Node.DOCUMENT_FRAGMENT_NODE){o=i;break}i=i.parentNode}o&&(n=o.activeElement)}e.contains(n)&&(n.blur(),n===document.activeElement&&document.body.focus())}},{key:"_visitNode",value:function(e){e.nodeType===Node.ELEMENT_NODE&&((e=e)!==this._rootElement&&e.hasAttribute("inert")&&this._adoptInertRoot(e),(r.call(e,t)||e.hasAttribute("tabindex"))&&this._manageNode(e))}},{key:"_manageNode",value:function(e){e=this._inertManager.register(e,this);this._managedNodes.add(e)}},{key:"_unmanageNode",value:function(e){e=this._inertManager.deregister(e,this);e&&this._managedNodes.delete(e)}},{key:"_unmanageSubtree",value:function(e){var t=this;c(e,function(e){return t._unmanageNode(e)})}},{key:"_adoptInertRoot",value:function(e){var t=this._inertManager.getInertRoot(e);t||(this._inertManager.setInert(e,!0),t=this._inertManager.getInertRoot(e)),t.managedNodes.forEach(function(e){this._manageNode(e.node)},this)}},{key:"_onMutation",value:function(e,t){e.forEach(function(e){var t,n=e.target;"childList"===e.type?(o.call(e.addedNodes).forEach(function(e){this._makeSubtreeUnfocusable(e)},this),o.call(e.removedNodes).forEach(function(e){this._unmanageSubtree(e)},this)):"attributes"===e.type&&("tabindex"===e.attributeName?this._manageNode(n):n!==this._rootElement&&"inert"===e.attributeName&&n.hasAttribute("inert")&&(this._adoptInertRoot(n),t=this._inertManager.getInertRoot(n),this._managedNodes.forEach(function(e){n.contains(e.node)&&t._manageNode(e.node)})))},this)}},{key:"managedNodes",get:function(){return new Set(this._managedNodes)}},{key:"hasSavedAriaHidden",get:function(){return null!==this._savedAriaHidden}},{key:"savedAriaHidden",set:function(e){this._savedAriaHidden=e},get:function(){return this._savedAriaHidden}}]),i=u,e(h,[{key:"destructor",value:function(){var e;this._throwIfDestroyed(),this._node&&this._node.nodeType===Node.ELEMENT_NODE&&(e=this._node,null!==this._savedTabIndex?e.setAttribute("tabindex",this._savedTabIndex):e.removeAttribute("tabindex"),this._overrodeFocusMethod&&delete e.focus),this._node=null,this._inertRoots=null,this._destroyed=!0}},{key:"_throwIfDestroyed",value:function(){if(this.destroyed)throw new Error("Trying to access destroyed InertNode")}},{key:"ensureUntabbable",value:function(){var e;this.node.nodeType===Node.ELEMENT_NODE&&(e=this.node,r.call(e,t)?-1===e.tabIndex&&this.hasSavedTabIndex||(e.hasAttribute("tabindex")&&(this._savedTabIndex=e.tabIndex),e.setAttribute("tabindex","-1"),e.nodeType===Node.ELEMENT_NODE&&(e.focus=function(){},this._overrodeFocusMethod=!0)):e.hasAttribute("tabindex")&&(this._savedTabIndex=e.tabIndex,e.removeAttribute("tabindex")))}},{key:"addInertRoot",value:function(e){this._throwIfDestroyed(),this._inertRoots.add(e)}},{key:"removeInertRoot",value:function(e){this._throwIfDestroyed(),this._inertRoots.delete(e),0===this._inertRoots.size&&this.destructor()}},{key:"destroyed",get:function(){return this._destroyed}},{key:"hasSavedTabIndex",get:function(){return null!==this._savedTabIndex}},{key:"node",get:function(){return this._throwIfDestroyed(),this._node}},{key:"savedTabIndex",set:function(e){this._throwIfDestroyed(),this._savedTabIndex=e},get:function(){return this._throwIfDestroyed(),this._savedTabIndex}}]),s=h,e(l,[{key:"setInert",value:function(e,t){if(t){if(!this._inertRoots.has(e)){t=new i(e,this);if(e.setAttribute("inert",""),this._inertRoots.set(e,t),!this._document.body.contains(e))for(var n=e.parentNode;n;)11===n.nodeType&&_(n),n=n.parentNode}}else this._inertRoots.has(e)&&(this._inertRoots.get(e).destructor(),this._inertRoots.delete(e),e.removeAttribute("inert"))}},{key:"getInertRoot",value:function(e){return this._inertRoots.get(e)}},{key:"register",value:function(e,t){var n=this._managedNodes.get(e);return void 0!==n?n.addInertRoot(t):n=new s(e,t),this._managedNodes.set(e,n),n}},{key:"deregister",value:function(e,t){var n=this._managedNodes.get(e);return n?(n.removeInertRoot(t),n.destroyed&&this._managedNodes.delete(e),n):null}},{key:"_onDocumentLoaded",value:function(){o.call(this._document.querySelectorAll("[inert]")).forEach(function(e){this.setInert(e,!0)},this),this._observer.observe(this._document.body||this._document.documentElement,{attributes:!0,subtree:!0,childList:!0})}},{key:"_watchForInert",value:function(e,t){var i=this;e.forEach(function(e){switch(e.type){case"childList":o.call(e.addedNodes).forEach(function(e){var t;e.nodeType===Node.ELEMENT_NODE&&(t=o.call(e.querySelectorAll("[inert]")),r.call(e,"[inert]")&&t.unshift(e),t.forEach(function(e){this.setInert(e,!0)},i))},i);break;case"attributes":if("inert"!==e.attributeName)return;var t=e.target,n=t.hasAttribute("inert");i.setInert(t,n)}},this)}}]),e=l,HTMLElement.prototype.hasOwnProperty("inert")||(n=new e(document),Object.defineProperty(HTMLElement.prototype,"inert",{enumerable:!0,get:function(){return this.hasAttribute("inert")},set:function(e){n.setInert(this,e)}})))});
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