--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/wp/wp-includes/js/dist/vendor/wp-polyfill-inert.js Fri Sep 05 18:40:08 2025 +0200
@@ -0,0 +1,840 @@
+(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).
+ */
+
+ (function () {
+ // Return early if we're not running inside of the browser.
+ if (typeof window === 'undefined') {
+ return;
+ }
+
+ // 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])', 'details', 'summary', '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 {!HTMLElement} rootElement The HTMLElement 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 {!HTMLElement} */
+ 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 {!HTMLElement} */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 {!HTMLElement} 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 {!HTMLElement} */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 {!HTMLElement} */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 {!HTMLElement} */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 {!HTMLElement} 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 || this._document.documentElement, { 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 {!HTMLElement} */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 (!HTMLElement))=} 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 {!HTMLElement} */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, link#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' + ' -webkit-user-select: none;\n' + ' -moz-user-select: none;\n' + ' -ms-user-select: none;\n' + ' user-select: none;\n' + '}\n';
+ node.appendChild(style);
+ }
+
+ if (!HTMLElement.prototype.hasOwnProperty('inert')) {
+ /** @type {!InertManager} */
+ var inertManager = new InertManager(document);
+
+ Object.defineProperty(HTMLElement.prototype, 'inert', {
+ enumerable: true,
+ /** @this {!HTMLElement} */
+ get: function get() {
+ return this.hasAttribute('inert');
+ },
+ /** @this {!HTMLElement} */
+ set: function set(inert) {
+ inertManager.setInert(this, inert);
+ }
+ });
+ }
+ })();
+
+})));