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http:\/\/moodle.org\/\n\/\/\n\/\/ Moodle is free software: you can redistribute it and\/or modify\n\/\/ it under the terms of the GNU General Public License as published by\n\/\/ the Free Software Foundation, either version 3 of the License, or\n\/\/ (at your option) any later version.\n\/\/\n\/\/ Moodle is distributed in the hope that it will be useful,\n\/\/ but WITHOUT ANY WARRANTY; without even the implied warranty of\n\/\/ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n\/\/ GNU General Public License for more details.\n\/\/\n\/\/ You should have received a copy of the GNU General Public License\n\/\/ along with Moodle.  If not, see <http:\/\/www.gnu.org\/licenses\/>.\n\n\/**\n * ARIA helpers related to the aria-hidden attribute.\n *\n * @module     core\/local\/aria\/aria-hidden.\n * @class      aria\n * @package    core\n * @copyright  2020 Andrew Nicols <andrew@nicols.co.uk>\n * @license    http:\/\/www.gnu.org\/copyleft\/gpl.html GNU GPL v3 or later\n *\/\nimport {getList} from 'core\/normalise';\nimport Selectors from '.\/selectors';\n\n\/\/ The map of MutationObserver objects for an object.\nconst childObserverMap = new Map();\nconst siblingObserverMap = new Map();\n\n\/**\n * Determine whether the browser supports the MutationObserver system.\n *\n * @returns {Bool}\n *\/\nconst supportsMutationObservers = () => (MutationObserver && typeof MutationObserver === 'function');\n\n\/**\n * Disable element focusability, disabling the tabindex for child elements which are normally focusable.\n *\n * @param {HTMLElement} target\n *\/\nconst disableElementFocusability = target => {\n    if (!(target instanceof HTMLElement)) {\n        \/\/ This element is not an HTMLElement.\n        \/\/ This can happen for Text Nodes.\n        return;\n    }\n\n    if (target.matches(Selectors.elements.focusable)) {\n        disableAndStoreTabIndex(target);\n    }\n\n    target.querySelectorAll(Selectors.elements.focusable).forEach(disableAndStoreTabIndex);\n};\n\n\/**\n * Remove the current tab-index and store it for later restoration.\n *\n * @param {HTMLElement} element\n *\/\nconst disableAndStoreTabIndex = element => {\n    if (typeof element.dataset.ariaHiddenTabIndex !== 'undefined') {\n        \/\/ This child already has a hidden attribute.\n        \/\/ Do not modify it as the original value will be lost.\n        return;\n    }\n\n    \/\/ Store the old tabindex in a data attribute.\n    if (element.getAttribute('tabindex')) {\n        element.dataset.ariaHiddenTabIndex = element.getAttribute('tabindex');\n    } else {\n        element.dataset.ariaHiddenTabIndex = '';\n    }\n    element.setAttribute('tabindex', -1);\n};\n\n\/**\n * Re-enable element focusability, restoring any tabindex.\n *\n * @param {HTMLElement} target\n *\/\nconst enableElementFocusability = target => {\n    if (!(target instanceof HTMLElement)) {\n        \/\/ This element is not an HTMLElement.\n        \/\/ This can happen for Text Nodes.\n        return;\n    }\n\n    if (target.matches(Selectors.elements.focusableToUnhide)) {\n        restoreTabIndex(target);\n    }\n\n    target.querySelectorAll(Selectors.elements.focusableToUnhide).forEach(restoreTabIndex);\n};\n\n\/**\n * Restore the tab-index of the supplied element.\n *\n * When disabling focusability the current tab-index is stored in the ariaHiddenTabIndex data attribute.\n * This is used to restore the tab-index, but only whilst the parent nodes remain unhidden.\n *\n * @param {HTMLElement} element\n *\/\nconst restoreTabIndex = element => {\n    if (element.closest(Selectors.aria.hidden)) {\n        \/\/ This item still has a hidden parent, or is hidden itself. 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