Use JS to open/close the modal

plugins/wporg-5ftf/assets/js/frontend.js

@@ -0,0 +1,101 @@
+/* global ajaxurl, FiveForTheFuture, jQuery */
+jQuery( document ).ready( function( $ ) {
+	const button = document.getElementById( 'toggle-management-link-form' );
+	const template = wp.template( '5ftf-send-link-dialog' );
+
+	if ( ! template && ! button ) {
+		// No modal on this page.
+		return;
+	}
+
+	$( document.body ).prepend( template() );
+	const modal = document.getElementById( 'send-link-dialog' );
+	const children = document.querySelectorAll( 'body > *:not([role="dialog"])' );
+
+	/**
+	 * Get the top/left position for the modal, based on the button location.
+	 */
+	function getModalPosition() {
+		const offsetTop = ( 'number' === typeof window.scrollY ) ? window.scrollY : window.pageYOffset;
+		const offsetLeft = ( 'number' === typeof window.scrollX ) ? window.scrollX : window.pageXOffset;
+		const bounds = button.getBoundingClientRect();
+		const modalWidth = 300; // Modal width is hardcoded, because it's not visible yet.
+
+		return {
+			top: bounds.y + offsetTop + bounds.height,
+			left: bounds.x + offsetLeft + bounds.width - modalWidth,
+		}
+	}
+
+	/**
+	 * Open the modal.
+	 */
+	function openModal() {
+		const position = getModalPosition();
+		// Hide other content on this page while modal is open.
+		for ( i = 0; i < children.length; i++ ) {
+			if ( children[i].getAttribute('inert') ) {
+				children[i].setAttribute('data-keep-inert', '');
+			} else {
+				children[i].setAttribute('inert', 'true');
+			}
+		}
+
+		modal.removeAttribute( 'hidden' );
+		modal.style.top = position.top + 'px';
+		modal.style.left = position.left + 'px';
+		modal.focus();
+	}
+
+	/**
+	 * Close the modal.
+	 */
+	function closeModal() {
+		// Reveal content again.
+		for ( i = 0; i < children.length; i++ ) {
+			if ( !children[i].hasAttribute('data-keep-inert') ) {
+				children[i].removeAttribute('inert');
+			}
+
+			children[i].removeAttribute('data-keep-inert');
+		}
+
+		modal.hidden = true;
+
+		// Wait a tick before setting focus. See https://github.com/WICG/inert#performance-and-gotchas
+		setTimeout( function() {
+			if ( button ) {
+				button.focus();
+			} else {
+				document.body.focus();
+			}
+		}, 0);
+	}
+
+	function sendRequest() {
+		//
+	}
+
+	// Initialize.
+	$( button ).on( 'click', function( event ) {
+		event.preventDefault();
+
+		if ( !! modal.hidden ) {
+			openModal( event );
+		} else {
+			closeModal( event );
+		}
+	} );
+
+	$( modal ).on( 'click', '.pledge-dialog__close', closeModal );
+	$( document ).on( 'keydown', function( event ) {
+		if ( 27 === event.which ) { // Esc
+			closeModal( event );
+		}
+	} );
+
+	$( modal ).on( 'submit', 'form', sendRequest );
+} );
+
+
+

plugins/wporg-5ftf/assets/js/inert.js

@@ -0,0 +1,833 @@
+(function (global, factory) {
+  typeof exports === 'object' && typeof module !== 'undefined' ? factory() :
+  typeof define === 'function' && define.amd ? define('inert', factory) :
+  (factory());
+}(this, (function () { 'use strict';
+
+  var _createClass = function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }();
+
+  function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
+
+  /**
+   * This work is licensed under the W3C Software and Document License
+   * (http://www.w3.org/Consortium/Legal/2015/copyright-software-and-document).
+   */
+
+  // Convenience function for converting NodeLists.
+  /** @type {typeof Array.prototype.slice} */
+  var slice = Array.prototype.slice;
+
+  /**
+   * IE has a non-standard name for "matches".
+   * @type {typeof Element.prototype.matches}
+   */
+  var matches = Element.prototype.matches || Element.prototype.msMatchesSelector;
+
+  /** @type {string} */
+  var _focusableElementsString = ['a[href]', 'area[href]', 'input:not([disabled])', 'select:not([disabled])', 'textarea:not([disabled])', 'button:not([disabled])', 'iframe', 'object', 'embed', '[contenteditable]'].join(',');
+
+  /**
+   * `InertRoot` manages a single inert subtree, i.e. a DOM subtree whose root element has an `inert`
+   * attribute.
+   *
+   * Its main functions are:
+   *
+   * - to create and maintain a set of managed `InertNode`s, including when mutations occur in the
+   *   subtree. The `makeSubtreeUnfocusable()` method handles collecting `InertNode`s via registering
+   *   each focusable node in the subtree with the singleton `InertManager` which manages all known
+   *   focusable nodes within inert subtrees. `InertManager` ensures that a single `InertNode`
+   *   instance exists for each focusable node which has at least one inert root as an ancestor.
+   *
+   * - to notify all managed `InertNode`s when this subtree stops being inert (i.e. when the `inert`
+   *   attribute is removed from the root node). This is handled in the destructor, which calls the
+   *   `deregister` method on `InertManager` for each managed inert node.
+   */
+
+  var InertRoot = function () {
+    /**
+     * @param {!Element} rootElement The Element at the root of the inert subtree.
+     * @param {!InertManager} inertManager The global singleton InertManager object.
+     */
+    function InertRoot(rootElement, inertManager) {
+      _classCallCheck(this, InertRoot);
+
+      /** @type {!InertManager} */
+      this._inertManager = inertManager;
+
+      /** @type {!Element} */
+      this._rootElement = rootElement;
+
+      /**
+       * @type {!Set<!InertNode>}
+       * All managed focusable nodes in this InertRoot's subtree.
+       */
+      this._managedNodes = new Set();
+
+      // Make the subtree hidden from assistive technology
+      if (this._rootElement.hasAttribute('aria-hidden')) {
+        /** @type {?string} */
+        this._savedAriaHidden = this._rootElement.getAttribute('aria-hidden');
+      } else {
+        this._savedAriaHidden = null;
+      }
+      this._rootElement.setAttribute('aria-hidden', 'true');
+
+      // Make all focusable elements in the subtree unfocusable and add them to _managedNodes
+      this._makeSubtreeUnfocusable(this._rootElement);
+
+      // Watch for:
+      // - any additions in the subtree: make them unfocusable too
+      // - any removals from the subtree: remove them from this inert root's managed nodes
+      // - attribute changes: if `tabindex` is added, or removed from an intrinsically focusable
+      //   element, make that node a managed node.
+      this._observer = new MutationObserver(this._onMutation.bind(this));
+      this._observer.observe(this._rootElement, { attributes: true, childList: true, subtree: true });
+    }
+
+    /**
+     * Call this whenever this object is about to become obsolete.  This unwinds all of the state
+     * stored in this object and updates the state of all of the managed nodes.
+     */
+
+
+    _createClass(InertRoot, [{
+      key: 'destructor',
+      value: function destructor() {
+        this._observer.disconnect();
+
+        if (this._rootElement) {
+          if (this._savedAriaHidden !== null) {
+            this._rootElement.setAttribute('aria-hidden', this._savedAriaHidden);
+          } else {
+            this._rootElement.removeAttribute('aria-hidden');
+          }
+        }
+
+        this._managedNodes.forEach(function (inertNode) {
+          this._unmanageNode(inertNode.node);
+        }, this);
+
+        // Note we cast the nulls to the ANY type here because:
+        // 1) We want the class properties to be declared as non-null, or else we
+        //    need even more casts throughout this code. All bets are off if an
+        //    instance has been destroyed and a method is called.
+        // 2) We don't want to cast "this", because we want type-aware optimizations
+        //    to know which properties we're setting.
+        this._observer = /** @type {?} */null;
+        this._rootElement = /** @type {?} */null;
+        this._managedNodes = /** @type {?} */null;
+        this._inertManager = /** @type {?} */null;
+      }
+
+      /**
+       * @return {!Set<!InertNode>} A copy of this InertRoot's managed nodes set.
+       */
+
+    }, {
+      key: '_makeSubtreeUnfocusable',
+
+
+      /**
+       * @param {!Node} startNode
+       */
+      value: function _makeSubtreeUnfocusable(startNode) {
+        var _this2 = this;
+
+        composedTreeWalk(startNode, function (node) {
+          return _this2._visitNode(node);
+        });
+
+        var activeElement = document.activeElement;
+
+        if (!document.body.contains(startNode)) {
+          // startNode may be in shadow DOM, so find its nearest shadowRoot to get the activeElement.
+          var node = startNode;
+          /** @type {!ShadowRoot|undefined} */
+          var root = undefined;
+          while (node) {
+            if (node.nodeType === Node.DOCUMENT_FRAGMENT_NODE) {
+              root = /** @type {!ShadowRoot} */node;
+              break;
+            }
+            node = node.parentNode;
+          }
+          if (root) {
+            activeElement = root.activeElement;
+          }
+        }
+        if (startNode.contains(activeElement)) {
+          activeElement.blur();
+          // In IE11, if an element is already focused, and then set to tabindex=-1
+          // calling blur() will not actually move the focus.
+          // To work around this we call focus() on the body instead.
+          if (activeElement === document.activeElement) {
+            document.body.focus();
+          }
+        }
+      }
+
+      /**
+       * @param {!Node} node
+       */
+
+    }, {
+      key: '_visitNode',
+      value: function _visitNode(node) {
+        if (node.nodeType !== Node.ELEMENT_NODE) {
+          return;
+        }
+        var element = /** @type {!Element} */node;
+
+        // If a descendant inert root becomes un-inert, its descendants will still be inert because of
+        // this inert root, so all of its managed nodes need to be adopted by this InertRoot.
+        if (element !== this._rootElement && element.hasAttribute('inert')) {
+          this._adoptInertRoot(element);
+        }
+
+        if (matches.call(element, _focusableElementsString) || element.hasAttribute('tabindex')) {
+          this._manageNode(element);
+        }
+      }
+
+      /**
+       * Register the given node with this InertRoot and with InertManager.
+       * @param {!Node} node
+       */
+
+    }, {
+      key: '_manageNode',
+      value: function _manageNode(node) {
+        var inertNode = this._inertManager.register(node, this);
+        this._managedNodes.add(inertNode);
+      }
+
+      /**
+       * Unregister the given node with this InertRoot and with InertManager.
+       * @param {!Node} node
+       */
+
+    }, {
+      key: '_unmanageNode',
+      value: function _unmanageNode(node) {
+        var inertNode = this._inertManager.deregister(node, this);
+        if (inertNode) {
+          this._managedNodes['delete'](inertNode);
+        }
+      }
+
+      /**
+       * Unregister the entire subtree starting at `startNode`.
+       * @param {!Node} startNode
+       */
+
+    }, {
+      key: '_unmanageSubtree',
+      value: function _unmanageSubtree(startNode) {
+        var _this3 = this;
+
+        composedTreeWalk(startNode, function (node) {
+          return _this3._unmanageNode(node);
+        });
+      }
+
+      /**
+       * If a descendant node is found with an `inert` attribute, adopt its managed nodes.
+       * @param {!Element} node
+       */
+
+    }, {
+      key: '_adoptInertRoot',
+      value: function _adoptInertRoot(node) {
+        var inertSubroot = this._inertManager.getInertRoot(node);
+
+        // During initialisation this inert root may not have been registered yet,
+        // so register it now if need be.
+        if (!inertSubroot) {
+          this._inertManager.setInert(node, true);
+          inertSubroot = this._inertManager.getInertRoot(node);
+        }
+
+        inertSubroot.managedNodes.forEach(function (savedInertNode) {
+          this._manageNode(savedInertNode.node);
+        }, this);
+      }
+
+      /**
+       * Callback used when mutation observer detects subtree additions, removals, or attribute changes.
+       * @param {!Array<!MutationRecord>} records
+       * @param {!MutationObserver} self
+       */
+
+    }, {
+      key: '_onMutation',
+      value: function _onMutation(records, self) {
+        records.forEach(function (record) {
+          var target = /** @type {!Element} */record.target;
+          if (record.type === 'childList') {
+            // Manage added nodes
+            slice.call(record.addedNodes).forEach(function (node) {
+              this._makeSubtreeUnfocusable(node);
+            }, this);
+
+            // Un-manage removed nodes
+            slice.call(record.removedNodes).forEach(function (node) {
+              this._unmanageSubtree(node);
+            }, this);
+          } else if (record.type === 'attributes') {
+            if (record.attributeName === 'tabindex') {
+              // Re-initialise inert node if tabindex changes
+              this._manageNode(target);
+            } else if (target !== this._rootElement && record.attributeName === 'inert' && target.hasAttribute('inert')) {
+              // If a new inert root is added, adopt its managed nodes and make sure it knows about the
+              // already managed nodes from this inert subroot.
+              this._adoptInertRoot(target);
+              var inertSubroot = this._inertManager.getInertRoot(target);
+              this._managedNodes.forEach(function (managedNode) {
+                if (target.contains(managedNode.node)) {
+                  inertSubroot._manageNode(managedNode.node);
+                }
+              });
+            }
+          }
+        }, this);
+      }
+    }, {
+      key: 'managedNodes',
+      get: function get() {
+        return new Set(this._managedNodes);
+      }
+
+      /** @return {boolean} */
+
+    }, {
+      key: 'hasSavedAriaHidden',
+      get: function get() {
+        return this._savedAriaHidden !== null;
+      }
+
+      /** @param {?string} ariaHidden */
+
+    }, {
+      key: 'savedAriaHidden',
+      set: function set(ariaHidden) {
+        this._savedAriaHidden = ariaHidden;
+      }
+
+      /** @return {?string} */
+      ,
+      get: function get() {
+        return this._savedAriaHidden;
+      }
+    }]);
+
+    return InertRoot;
+  }();
+
+  /**
+   * `InertNode` initialises and manages a single inert node.
+   * A node is inert if it is a descendant of one or more inert root elements.
+   *
+   * On construction, `InertNode` saves the existing `tabindex` value for the node, if any, and
+   * either removes the `tabindex` attribute or sets it to `-1`, depending on whether the element
+   * is intrinsically focusable or not.
+   *
+   * `InertNode` maintains a set of `InertRoot`s which are descendants of this `InertNode`. When an
+   * `InertRoot` is destroyed, and calls `InertManager.deregister()`, the `InertManager` notifies the
+   * `InertNode` via `removeInertRoot()`, which in turn destroys the `InertNode` if no `InertRoot`s
+   * remain in the set. On destruction, `InertNode` reinstates the stored `tabindex` if one exists,
+   * or removes the `tabindex` attribute if the element is intrinsically focusable.
+   */
+
+
+  var InertNode = function () {
+    /**
+     * @param {!Node} node A focusable element to be made inert.
+     * @param {!InertRoot} inertRoot The inert root element associated with this inert node.
+     */
+    function InertNode(node, inertRoot) {
+      _classCallCheck(this, InertNode);
+
+      /** @type {!Node} */
+      this._node = node;
+
+      /** @type {boolean} */
+      this._overrodeFocusMethod = false;
+
+      /**
+       * @type {!Set<!InertRoot>} The set of descendant inert roots.
+       *    If and only if this set becomes empty, this node is no longer inert.
+       */
+      this._inertRoots = new Set([inertRoot]);
+
+      /** @type {?number} */
+      this._savedTabIndex = null;
+
+      /** @type {boolean} */
+      this._destroyed = false;
+
+      // Save any prior tabindex info and make this node untabbable
+      this.ensureUntabbable();
+    }
+
+    /**
+     * Call this whenever this object is about to become obsolete.
+     * This makes the managed node focusable again and deletes all of the previously stored state.
+     */
+
+
+    _createClass(InertNode, [{
+      key: 'destructor',
+      value: function destructor() {
+        this._throwIfDestroyed();
+
+        if (this._node && this._node.nodeType === Node.ELEMENT_NODE) {
+          var element = /** @type {!Element} */this._node;
+          if (this._savedTabIndex !== null) {
+            element.setAttribute('tabindex', this._savedTabIndex);
+          } else {
+            element.removeAttribute('tabindex');
+          }
+
+          // Use `delete` to restore native focus method.
+          if (this._overrodeFocusMethod) {
+            delete element.focus;
+          }
+        }
+
+        // See note in InertRoot.destructor for why we cast these nulls to ANY.
+        this._node = /** @type {?} */null;
+        this._inertRoots = /** @type {?} */null;
+        this._destroyed = true;
+      }
+
+      /**
+       * @type {boolean} Whether this object is obsolete because the managed node is no longer inert.
+       * If the object has been destroyed, any attempt to access it will cause an exception.
+       */
+
+    }, {
+      key: '_throwIfDestroyed',
+
+
+      /**
+       * Throw if user tries to access destroyed InertNode.
+       */
+      value: function _throwIfDestroyed() {
+        if (this.destroyed) {
+          throw new Error('Trying to access destroyed InertNode');
+        }
+      }
+
+      /** @return {boolean} */
+
+    }, {
+      key: 'ensureUntabbable',
+
+
+      /** Save the existing tabindex value and make the node untabbable and unfocusable */
+      value: function ensureUntabbable() {
+        if (this.node.nodeType !== Node.ELEMENT_NODE) {
+          return;
+        }
+        var element = /** @type {!Element} */this.node;
+        if (matches.call(element, _focusableElementsString)) {
+          if ( /** @type {!HTMLElement} */element.tabIndex === -1 && this.hasSavedTabIndex) {
+            return;
+          }
+
+          if (element.hasAttribute('tabindex')) {
+            this._savedTabIndex = /** @type {!HTMLElement} */element.tabIndex;
+          }
+          element.setAttribute('tabindex', '-1');
+          if (element.nodeType === Node.ELEMENT_NODE) {
+            element.focus = function () {};
+            this._overrodeFocusMethod = true;
+          }
+        } else if (element.hasAttribute('tabindex')) {
+          this._savedTabIndex = /** @type {!HTMLElement} */element.tabIndex;
+          element.removeAttribute('tabindex');
+        }
+      }
+
+      /**
+       * Add another inert root to this inert node's set of managing inert roots.
+       * @param {!InertRoot} inertRoot
+       */
+
+    }, {
+      key: 'addInertRoot',
+      value: function addInertRoot(inertRoot) {
+        this._throwIfDestroyed();
+        this._inertRoots.add(inertRoot);
+      }
+
+      /**
+       * Remove the given inert root from this inert node's set of managing inert roots.
+       * If the set of managing inert roots becomes empty, this node is no longer inert,
+       * so the object should be destroyed.
+       * @param {!InertRoot} inertRoot
+       */
+
+    }, {
+      key: 'removeInertRoot',
+      value: function removeInertRoot(inertRoot) {
+        this._throwIfDestroyed();
+        this._inertRoots['delete'](inertRoot);
+        if (this._inertRoots.size === 0) {
+          this.destructor();
+        }
+      }
+    }, {
+      key: 'destroyed',
+      get: function get() {
+        return (/** @type {!InertNode} */this._destroyed
+        );
+      }
+    }, {
+      key: 'hasSavedTabIndex',
+      get: function get() {
+        return this._savedTabIndex !== null;
+      }
+
+      /** @return {!Node} */
+
+    }, {
+      key: 'node',
+      get: function get() {
+        this._throwIfDestroyed();
+        return this._node;
+      }
+
+      /** @param {?number} tabIndex */
+
+    }, {
+      key: 'savedTabIndex',
+      set: function set(tabIndex) {
+        this._throwIfDestroyed();
+        this._savedTabIndex = tabIndex;
+      }
+
+      /** @return {?number} */
+      ,
+      get: function get() {
+        this._throwIfDestroyed();
+        return this._savedTabIndex;
+      }
+    }]);
+
+    return InertNode;
+  }();
+
+  /**
+   * InertManager is a per-document singleton object which manages all inert roots and nodes.
+   *
+   * When an element becomes an inert root by having an `inert` attribute set and/or its `inert`
+   * property set to `true`, the `setInert` method creates an `InertRoot` object for the element.
+   * The `InertRoot` in turn registers itself as managing all of the element's focusable descendant
+   * nodes via the `register()` method. The `InertManager` ensures that a single `InertNode` instance
+   * is created for each such node, via the `_managedNodes` map.
+   */
+
+
+  var InertManager = function () {
+    /**
+     * @param {!Document} document
+     */
+    function InertManager(document) {
+      _classCallCheck(this, InertManager);
+
+      if (!document) {
+        throw new Error('Missing required argument; InertManager needs to wrap a document.');
+      }
+
+      /** @type {!Document} */
+      this._document = document;
+
+      /**
+       * All managed nodes known to this InertManager. In a map to allow looking up by Node.
+       * @type {!Map<!Node, !InertNode>}
+       */
+      this._managedNodes = new Map();
+
+      /**
+       * All inert roots known to this InertManager. In a map to allow looking up by Node.
+       * @type {!Map<!Node, !InertRoot>}
+       */
+      this._inertRoots = new Map();
+
+      /**
+       * Observer for mutations on `document.body`.
+       * @type {!MutationObserver}
+       */
+      this._observer = new MutationObserver(this._watchForInert.bind(this));
+
+      // Add inert style.
+      addInertStyle(document.head || document.body || document.documentElement);
+
+      // Wait for document to be loaded.
+      if (document.readyState === 'loading') {
+        document.addEventListener('DOMContentLoaded', this._onDocumentLoaded.bind(this));
+      } else {
+        this._onDocumentLoaded();
+      }
+    }
+
+    /**
+     * Set whether the given element should be an inert root or not.
+     * @param {!Element} root
+     * @param {boolean} inert
+     */
+
+
+    _createClass(InertManager, [{
+      key: 'setInert',
+      value: function setInert(root, inert) {
+        if (inert) {
+          if (this._inertRoots.has(root)) {
+            // element is already inert
+            return;
+          }
+
+          var inertRoot = new InertRoot(root, this);
+          root.setAttribute('inert', '');
+          this._inertRoots.set(root, inertRoot);
+          // If not contained in the document, it must be in a shadowRoot.
+          // Ensure inert styles are added there.
+          if (!this._document.body.contains(root)) {
+            var parent = root.parentNode;
+            while (parent) {
+              if (parent.nodeType === 11) {
+                addInertStyle(parent);
+              }
+              parent = parent.parentNode;
+            }
+          }
+        } else {
+          if (!this._inertRoots.has(root)) {
+            // element is already non-inert
+            return;
+          }
+
+          var _inertRoot = this._inertRoots.get(root);
+          _inertRoot.destructor();
+          this._inertRoots['delete'](root);
+          root.removeAttribute('inert');
+        }
+      }
+
+      /**
+       * Get the InertRoot object corresponding to the given inert root element, if any.
+       * @param {!Node} element
+       * @return {!InertRoot|undefined}
+       */
+
+    }, {
+      key: 'getInertRoot',
+      value: function getInertRoot(element) {
+        return this._inertRoots.get(element);
+      }
+
+      /**
+       * Register the given InertRoot as managing the given node.
+       * In the case where the node has a previously existing inert root, this inert root will
+       * be added to its set of inert roots.
+       * @param {!Node} node
+       * @param {!InertRoot} inertRoot
+       * @return {!InertNode} inertNode
+       */
+
+    }, {
+      key: 'register',
+      value: function register(node, inertRoot) {
+        var inertNode = this._managedNodes.get(node);
+        if (inertNode !== undefined) {
+          // node was already in an inert subtree
+          inertNode.addInertRoot(inertRoot);
+        } else {
+          inertNode = new InertNode(node, inertRoot);
+        }
+
+        this._managedNodes.set(node, inertNode);
+
+        return inertNode;
+      }
+
+      /**
+       * De-register the given InertRoot as managing the given inert node.
+       * Removes the inert root from the InertNode's set of managing inert roots, and remove the inert
+       * node from the InertManager's set of managed nodes if it is destroyed.
+       * If the node is not currently managed, this is essentially a no-op.
+       * @param {!Node} node
+       * @param {!InertRoot} inertRoot
+       * @return {?InertNode} The potentially destroyed InertNode associated with this node, if any.
+       */
+
+    }, {
+      key: 'deregister',
+      value: function deregister(node, inertRoot) {
+        var inertNode = this._managedNodes.get(node);
+        if (!inertNode) {
+          return null;
+        }
+
+        inertNode.removeInertRoot(inertRoot);
+        if (inertNode.destroyed) {
+          this._managedNodes['delete'](node);
+        }
+
+        return inertNode;
+      }
+
+      /**
+       * Callback used when document has finished loading.
+       */
+
+    }, {
+      key: '_onDocumentLoaded',
+      value: function _onDocumentLoaded() {
+        // Find all inert roots in document and make them actually inert.
+        var inertElements = slice.call(this._document.querySelectorAll('[inert]'));
+        inertElements.forEach(function (inertElement) {
+          this.setInert(inertElement, true);
+        }, this);
+
+        // Comment this out to use programmatic API only.
+        this._observer.observe(this._document.body, { attributes: true, subtree: true, childList: true });
+      }
+
+      /**
+       * Callback used when mutation observer detects attribute changes.
+       * @param {!Array<!MutationRecord>} records
+       * @param {!MutationObserver} self
+       */
+
+    }, {
+      key: '_watchForInert',
+      value: function _watchForInert(records, self) {
+        var _this = this;
+        records.forEach(function (record) {
+          switch (record.type) {
+            case 'childList':
+              slice.call(record.addedNodes).forEach(function (node) {
+                if (node.nodeType !== Node.ELEMENT_NODE) {
+                  return;
+                }
+                var inertElements = slice.call(node.querySelectorAll('[inert]'));
+                if (matches.call(node, '[inert]')) {
+                  inertElements.unshift(node);
+                }
+                inertElements.forEach(function (inertElement) {
+                  this.setInert(inertElement, true);
+                }, _this);
+              }, _this);
+              break;
+            case 'attributes':
+              if (record.attributeName !== 'inert') {
+                return;
+              }
+              var target = /** @type {!Element} */record.target;
+              var inert = target.hasAttribute('inert');
+              _this.setInert(target, inert);
+              break;
+          }
+        }, this);
+      }
+    }]);
+
+    return InertManager;
+  }();
+
+  /**
+   * Recursively walk the composed tree from |node|.
+   * @param {!Node} node
+   * @param {(function (!Element))=} callback Callback to be called for each element traversed,
+   *     before descending into child nodes.
+   * @param {?ShadowRoot=} shadowRootAncestor The nearest ShadowRoot ancestor, if any.
+   */
+
+
+  function composedTreeWalk(node, callback, shadowRootAncestor) {
+    if (node.nodeType == Node.ELEMENT_NODE) {
+      var element = /** @type {!Element} */node;
+      if (callback) {
+        callback(element);
+      }
+
+      // Descend into node:
+      // If it has a ShadowRoot, ignore all child elements - these will be picked
+      // up by the <content> or <shadow> elements. Descend straight into the
+      // ShadowRoot.
+      var shadowRoot = /** @type {!HTMLElement} */element.shadowRoot;
+      if (shadowRoot) {
+        composedTreeWalk(shadowRoot, callback, shadowRoot);
+        return;
+      }
+
+      // If it is a <content> element, descend into distributed elements - these
+      // are elements from outside the shadow root which are rendered inside the
+      // shadow DOM.
+      if (element.localName == 'content') {
+        var content = /** @type {!HTMLContentElement} */element;
+        // Verifies if ShadowDom v0 is supported.
+        var distributedNodes = content.getDistributedNodes ? content.getDistributedNodes() : [];
+        for (var i = 0; i < distributedNodes.length; i++) {
+          composedTreeWalk(distributedNodes[i], callback, shadowRootAncestor);
+        }
+        return;
+      }
+
+      // If it is a <slot> element, descend into assigned nodes - these
+      // are elements from outside the shadow root which are rendered inside the
+      // shadow DOM.
+      if (element.localName == 'slot') {
+        var slot = /** @type {!HTMLSlotElement} */element;
+        // Verify if ShadowDom v1 is supported.
+        var _distributedNodes = slot.assignedNodes ? slot.assignedNodes({ flatten: true }) : [];
+        for (var _i = 0; _i < _distributedNodes.length; _i++) {
+          composedTreeWalk(_distributedNodes[_i], callback, shadowRootAncestor);
+        }
+        return;
+      }
+    }
+
+    // If it is neither the parent of a ShadowRoot, a <content> element, a <slot>
+    // element, nor a <shadow> element recurse normally.
+    var child = node.firstChild;
+    while (child != null) {
+      composedTreeWalk(child, callback, shadowRootAncestor);
+      child = child.nextSibling;
+    }
+  }
+
+  /**
+   * Adds a style element to the node containing the inert specific styles
+   * @param {!Node} node
+   */
+  function addInertStyle(node) {
+    if (node.querySelector('style#inert-style')) {
+      return;
+    }
+    var style = document.createElement('style');
+    style.setAttribute('id', 'inert-style');
+    style.textContent = '\n' + '[inert] {\n' + '  pointer-events: none;\n' + '  cursor: default;\n' + '}\n' + '\n' + '[inert], [inert] * {\n' + '  user-select: none;\n' + '  -webkit-user-select: none;\n' + '  -moz-user-select: none;\n' + '  -ms-user-select: none;\n' + '}\n';
+    node.appendChild(style);
+  }
+
+  /** @type {!InertManager} */
+  var inertManager = new InertManager(document);
+
+  if (!Element.prototype.hasOwnProperty('inert')) {
+    Object.defineProperty(Element.prototype, 'inert', {
+      enumerable: true,
+      /** @this {!Element} */
+      get: function get() {
+        return this.hasAttribute('inert');
+      },
+      /** @this {!Element} */
+      set: function set(inert) {
+        inertManager.setInert(this, inert);
+      }
+    });
+  }
+
+})));

plugins/wporg-5ftf/includes/pledge.php

@@ -27,6 +27,7 @@ add_filter( 'manage_edit-' . CPT_ID . '_columns',        __NAMESPACE__ . '\add_l
 add_action( 'manage_' . CPT_ID . '_posts_custom_column', __NAMESPACE__ . '\populate_list_table_columns', 10, 2 );
 
 // Front end hooks.
+add_action( 'wp_enqueue_scripts',  __NAMESPACE__ . '\enqueue_assets' );
 add_action( 'pledge_footer',       __NAMESPACE__ . '\render_manage_link_request' );
 add_action( 'wp_footer',           __NAMESPACE__ . '\render_js_templates' );
 
@@ -259,6 +260,33 @@ function filter_query( $query ) {
 	$query->set( 'posts_per_page', 100 );
 }
 
+/**
+ * Enqueue assets for front-end management.
+ *
+ * @return void
+ */
+function enqueue_assets() {
+	wp_register_script( 'wicg-inert', plugins_url( 'assets/js/inert.min.js', __DIR__ ), [], '3.0.0', true );
+
+	if ( CPT_ID === get_post_type() ) {
+		$ver = filemtime( FiveForTheFuture\PATH . '/assets/js/frontend.js' );
+		wp_enqueue_script( '5ftf-frontend', plugins_url( 'assets/js/frontend.js', __DIR__ ), [ 'jquery', 'wp-util', 'wicg-inert' ], $ver, true );
+
+		$script_data = [
+			'pledgeId'    => get_the_ID(),
+			'ajaxNonce' => wp_create_nonce( 'send-manage-email' ),
+		];
+		wp_add_inline_script(
+			'5ftf-frontend',
+			sprintf(
+				'var FiveForTheFuture = JSON.parse( decodeURIComponent( \'%s\' ) );',
+				rawurlencode( wp_json_encode( $script_data ) )
+			),
+			'before'
+		);
+	}
+}
+
 /**
  * Render the button to toggle the "Request Manage Email" dialog.
  *