diff --git a/lib/amd/build/aria.min.js b/lib/amd/build/aria.min.js
new file mode 100644
index 00000000000..f07ac09626f
--- /dev/null
+++ b/lib/amd/build/aria.min.js
@@ -0,0 +1,2 @@
+define ("core/aria",["exports","./local/aria/aria-hidden"],function(a,b){"use strict";Object.defineProperty(a,"__esModule",{value:!0});Object.defineProperty(a,"hide",{enumerable:!0,get:function get(){return b.hide}});Object.defineProperty(a,"unhide",{enumerable:!0,get:function get(){return b.unhide}});Object.defineProperty(a,"hideSiblings",{enumerable:!0,get:function get(){return b.hideSiblings}});Object.defineProperty(a,"unhideSiblings",{enumerable:!0,get:function get(){return b.unhideSiblings}})});
+//# sourceMappingURL=aria.min.js.map
diff --git a/lib/amd/build/aria.min.js.map b/lib/amd/build/aria.min.js.map
new file mode 100644
index 00000000000..c6a555db86c
--- /dev/null
+++ b/lib/amd/build/aria.min.js.map
@@ -0,0 +1 @@
+{"version":3,"sources":[],"names":[],"mappings":"","sourcesContent":[],"file":"aria.min.js"}
\ No newline at end of file
diff --git a/lib/amd/build/local/aria/aria-hidden.min.js b/lib/amd/build/local/aria/aria-hidden.min.js
new file mode 100644
index 00000000000..f5493607069
--- /dev/null
+++ b/lib/amd/build/local/aria/aria-hidden.min.js
@@ -0,0 +1,2 @@
+define ("core/local/aria/aria-hidden",["exports","core/normalise","./selectors"],function(a,b,c){"use strict";Object.defineProperty(a,"__esModule",{value:!0});a.unhideSiblings=a.hideSiblings=a.unhide=a.hide=void 0;c=function(a){return a&&a.__esModule?a:{default:a}}(c);var d=new Map,e=new Map,f=function(){return MutationObserver&&"function"==typeof MutationObserver},g=function(a){if(!(a instanceof HTMLElement)){return}if(a.matches(c.default.elements.focusable)){h(a)}a.querySelectorAll(c.default.elements.focusable).forEach(h)},h=function(a){if("undefined"!=typeof a.dataset.ariaHiddenTabIndex){return}if(a.getAttribute("tabindex")){a.dataset.ariaHiddenTabIndex=a.getAttribute("tabindex")}else{a.dataset.ariaHiddenTabIndex=""}a.setAttribute("tabindex",-1)},i=function(a){if(!(a instanceof HTMLElement)){return}if(a.matches(c.default.elements.focusableToUnhide)){j(a)}a.querySelectorAll(c.default.elements.focusableToUnhide).forEach(j)},j=function(a){if(a.closest(c.default.aria.hidden)){return}var b=a.dataset.ariaHiddenTabIndex;if(""===b){a.removeAttribute("tabindex")}else{a.setAttribute("tabindex",b)}delete a.dataset.ariaHiddenTabIndex},k=function(a){return(0,b.getList)(a).forEach(l)};a.hide=k;var l=function(a){if(!(a instanceof HTMLElement)){return}if(a.closest(c.default.aria.hidden)){return}a.setAttribute("aria-hidden",!0);g(a);if(f()){var b=new MutationObserver(function(a){a.forEach(function(a){a.addedNodes.forEach(g)})});b.observe(a,{childList:!0,subtree:!0});d.set(a,b)}},m=function(a){return(0,b.getList)(a).forEach(n)};a.unhide=m;var n=function(a){if(!(a instanceof HTMLElement)){return}a.removeAttribute("aria-hidden");i(a);if(d.has(a)){d.get(a).disconnect();d.delete(a)}};a.hideSiblings=function hideSiblings(a){return(0,b.getList)(a).forEach(o)};var o=function(a){if(!(a instanceof HTMLElement)){return}if(!a.parentElement){return}a.parentElement.childNodes.forEach(function(b){if(b===a){return}k(b)});if(f()){var b=new MutationObserver(function(b){b.forEach(function(b){b.addedNodes.forEach(function(b){if(a.contains(b)){return}k(b)})})});b.observe(a.parentElement,{childList:!0,subtree:!0});e.set(a.parentElement,b)}};a.unhideSiblings=function unhideSiblings(a){return(0,b.getList)(a).forEach(p)};var p=function(a){if(!(a instanceof HTMLElement)){return}if(!a.parentElement){return}a.parentElement.childNodes.forEach(function(b){if(b===a){return}m(b)});if(e.has(a.parentElement)){e.get(a.parentElement).disconnect();e.delete(a.parentElement)}}});
+//# sourceMappingURL=aria-hidden.min.js.map
diff --git a/lib/amd/build/local/aria/aria-hidden.min.js.map b/lib/amd/build/local/aria/aria-hidden.min.js.map
new file mode 100644
index 00000000000..38aa7e26d74
--- /dev/null
+++ b/lib/amd/build/local/aria/aria-hidden.min.js.map
@@ -0,0 +1 @@
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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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\ No newline at end of file
diff --git a/lib/amd/build/local/aria/selectors.min.js b/lib/amd/build/local/aria/selectors.min.js
new file mode 100644
index 00000000000..2d113d7e045
--- /dev/null
+++ b/lib/amd/build/local/aria/selectors.min.js
@@ -0,0 +1,2 @@
+define ("core/local/aria/selectors",["exports"],function(a){"use strict";Object.defineProperty(a,"__esModule",{value:!0});a.default=void 0;a.default={aria:{hidden:"[aria-hidden]"},elements:{focusable:"input:not([type=\"hidden\"]), a[href], button, textarea, select, [tabindex]",focusableToUnhide:"[data-aria-hidden-tab-index]"}};return a.default});
+//# sourceMappingURL=selectors.min.js.map
diff --git a/lib/amd/build/local/aria/selectors.min.js.map b/lib/amd/build/local/aria/selectors.min.js.map
new file mode 100644
index 00000000000..92e687259e7
--- /dev/null
+++ b/lib/amd/build/local/aria/selectors.min.js.map
@@ -0,0 +1 @@
+{"version":3,"sources":["../../../src/local/aria/selectors.js"],"names":["aria","hidden","elements","focusable","focusableToUnhide"],"mappings":"qJAwBe,CACXA,IAAI,CAAE,CACFC,MAAM,CAAE,eADN,CADK,CAIXC,QAAQ,CAAE,CACNC,SAAS,CAAE,6EADL,CAENC,iBAAiB,CAAE,8BAFb,CAJC,C","sourcesContent":["// This file is part of Moodle - 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 * Selectors used for ARIA.\n *\n * @module     core/local/aria/selectors\n * @class      selectors\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 */\nexport default {\n    aria: {\n        hidden: '[aria-hidden]',\n    },\n    elements: {\n        focusable: 'input:not([type=\"hidden\"]), a[href], button, textarea, select, [tabindex]',\n        focusableToUnhide: '[data-aria-hidden-tab-index]',\n    },\n};\n"],"file":"selectors.min.js"}
\ No newline at end of file
diff --git a/lib/amd/build/modal.min.js b/lib/amd/build/modal.min.js
index 69414dc845e..f1816d776e9 100644
--- a/lib/amd/build/modal.min.js
+++ b/lib/amd/build/modal.min.js
@@ -1,2 +1,2 @@
-function _typeof(a){"@babel/helpers - typeof";if("function"==typeof Symbol&&"symbol"==typeof Symbol.iterator){_typeof=function(a){return typeof a}}else{_typeof=function(a){return a&&"function"==typeof Symbol&&a.constructor===Symbol&&a!==Symbol.prototype?"symbol":typeof a}}return _typeof(a)}define ("core/modal",["jquery","core/templates","core/notification","core/key_codes","core/custom_interaction_events","core/modal_backdrop","core/event","core/modal_events","core/local/aria/focuslock","core/pending"],function(a,b,c,d,e,f,g,h,i,j){var k={CONTAINER:"[data-region=\"modal-container\"]",MODAL:"[data-region=\"modal\"]",HEADER:"[data-region=\"header\"]",TITLE:"[data-region=\"title\"]",BODY:"[data-region=\"body\"]",FOOTER:"[data-region=\"footer\"]",HIDE:"[data-action=\"hide\"]",DIALOG:"[role=dialog]",FORM:"form",MENU_BAR:"[role=menubar]",HAS_Z_INDEX:".moodle-has-zindex",CAN_RECEIVE_FOCUS:"input:not([type=\"hidden\"]), a[href], button, textarea, select, [tabindex]"},l={LOADING:"core/loading",BACKDROP:"core/modal_backdrop"},m,n=0,o=function(b){this.root=a(b);this.modal=this.root.find(k.MODAL);this.header=this.modal.find(k.HEADER);this.headerPromise=a.Deferred();this.title=this.header.find(k.TITLE);this.titlePromise=a.Deferred();this.body=this.modal.find(k.BODY);this.bodyPromise=a.Deferred();this.footer=this.modal.find(k.FOOTER);this.footerPromise=a.Deferred();this.hiddenSiblings=[];this.isAttached=!1;this.bodyJS=null;this.footerJS=null;this.modalCount=n++;if(!this.root.is(k.CONTAINER)){c.exception({message:"Element is not a modal container"})}if(!this.modal.length){c.exception({message:"Container does not contain a modal"})}if(!this.header.length){c.exception({message:"Modal is missing a header region"})}if(!this.title.length){c.exception({message:"Modal header is missing a title region"})}if(!this.body.length){c.exception({message:"Modal is missing a body region"})}if(!this.footer.length){c.exception({message:"Modal is missing a footer region"})}this.registerEventListeners()};o.prototype.attachToDOM=function(){if(this.isAttached){return}a("body").append(this.root);i.trapFocus(this.root[0]);if(this.bodyJS){b.runTemplateJS(this.bodyJS);this.bodyJS=null}if(this.footerJS){b.runTemplateJS(this.footerJS);this.footerJS=null}this.isAttached=!0};o.prototype.countOtherVisibleModals=function(){var b=0;a("body").find(k.CONTAINER).each(function(c,d){d=a(d);if(!this.root.is(d)&&d.hasClass("show")){b++}}.bind(this));return b};o.prototype.getBackdrop=function(){if(!m){m=b.render(l.BACKDROP,{}).then(function(b){var c=a(b);return new f(c)}).fail(c.exception)}return m};o.prototype.getRoot=function(){return this.root};o.prototype.getModal=function(){return this.modal};o.prototype.getTitle=function(){return this.title};o.prototype.getBody=function(){return this.body};o.prototype.getFooter=function(){return this.footer};o.prototype.getTitlePromise=function(){return this.titlePromise};o.prototype.getBodyPromise=function(){return this.bodyPromise};o.prototype.getFooterPromise=function(){return this.footerPromise};o.prototype.getModalCount=function(){return this.modalCount};o.prototype.setTitle=function(b){var d=this.getTitle();this.titlePromise=a.Deferred();this.asyncSet(b,d.html.bind(d)).then(function(){this.titlePromise.resolve(d)}.bind(this)).catch(c.exception)};o.prototype.setBody=function(d){this.bodyPromise=a.Deferred();var e=this.getBody();if("string"==typeof d){e.html(d);g.notifyFilterContentUpdated(e);this.getRoot().trigger(h.bodyRendered,this);this.bodyPromise.resolve(e)}else{var f="amd-modal-js-pending-id-"+this.getModalCount();M.util.js_pending(f);var i=null;e.css("overflow","hidden");d=a.when(d);if("pending"==d.state()){var j=e.innerHeight();if(100>j){j=100}e.animate({height:j+"px"},150);e.html("");i=b.render(l.LOADING,{}).then(function(b){var c=a(b).hide();e.html(c);c.fadeIn(150);return a.when(c.promise(),d)}).then(function(a){return a.fadeOut(100).promise()}).then(function(){return d})}else{i=d}i.then(function(a,c){var d=null;if(this.isVisible()){e.css("opacity",0);var f=e.innerHeight();e.html(a);e.css("height","");var g=e.innerHeight();e.css("height",f+"px");d=e.animate({height:g+"px",opacity:1},{duration:150,queue:!1}).promise()}else{e.html(a)}if(c){if(this.isAttached){b.runTemplateJS(c)}else{this.bodyJS=c}}return d}.bind(this)).then(function(a){g.notifyFilterContentUpdated(e);this.getRoot().trigger(h.bodyRendered,this);return a}.bind(this)).then(function(){this.bodyPromise.resolve(e)}.bind(this)).fail(c.exception).always(function(){e.css("height","");e.css("overflow","");e.css("opacity","");M.util.js_complete(f)}).fail(c.exception)}};o.prototype.setFooter=function(d){this.showFooter();this.footerPromise=a.Deferred();var e=this.getFooter();if("string"==typeof d){e.html(d);this.footerPromise.resolve(e)}else{b.render(l.LOADING,{}).then(function(a){e.html(a);return d}).then(function(a,c){e.html(a);if(c){if(this.isAttached){b.runTemplateJS(c)}else{this.footerJS=c}}return e}.bind(this)).then(function(a){this.footerPromise.resolve(a)}.bind(this)).catch(c.exception)}};o.prototype.hasFooterContent=function(){return this.getFooter().children().length?!0:!1};o.prototype.hideFooter=function(){this.getFooter().addClass("hidden")};o.prototype.showFooter=function(){this.getFooter().removeClass("hidden")};o.prototype.setLarge=function(){if(this.isLarge()){return}this.getModal().addClass("modal-lg")};o.prototype.isLarge=function(){return this.getModal().hasClass("modal-lg")};o.prototype.setSmall=function(){if(this.isSmall()){return}this.getModal().removeClass("modal-lg")};o.prototype.isSmall=function(){return!this.getModal().hasClass("modal-lg")};o.prototype.setScrollable=function(a){if(!a){this.getModal()[0].classList.remove("modal-dialog-scrollable");return}this.getModal()[0].classList.add("modal-dialog-scrollable")};o.prototype.calculateZIndex=function(){var b=a(k.DIALOG+", "+k.MENU_BAR+", "+k.HAS_Z_INDEX),c=parseInt(this.root.css("z-index"));b.each(function(b,d){d=a(d);var e=d.css("z-index")?parseInt(d.css("z-index")):0;if(e>c){c=e}});return c};o.prototype.isVisible=function(){return this.root.hasClass("show")};o.prototype.hasFocus=function(){var b=a(document.activeElement);return this.root.is(b)||this.root.has(b).length};o.prototype.hasTransitions=function(){return this.getRoot().hasClass("fade")};o.prototype.show=function(){if(this.isVisible()){return a.Deferred().resolve()}var b=new j("core/modal:show");if(this.hasFooterContent()){this.showFooter()}else{this.hideFooter()}if(!this.isAttached){this.attachToDOM()}return this.getBackdrop().then(function(b){var c=this.calculateZIndex(),d=c+2;this.root.css("z-index",d);b.setZIndex(d-1);b.show();this.root.removeClass("hide").addClass("show");this.accessibilityShow();this.getModal().focus();a("body").addClass("modal-open");this.root.trigger(h.shown,this)}.bind(this)).then(b.resolve)};o.prototype.hideIfNotForm=function(){var a=this.modal.find(k.FORM);if(0==a.length){this.hide()}};o.prototype.hide=function(){this.getBackdrop().done(function(b){i.untrapFocus();if(!this.countOtherVisibleModals()){b.hide();a("body").removeClass("modal-open")}var c=parseInt(this.root.css("z-index"));this.root.css("z-index","");b.setZIndex(c-3);this.accessibilityHide();if(this.hasTransitions()){this.getRoot().one("transitionend webkitTransitionEnd oTransitionEnd",function(){this.getRoot().removeClass("show").addClass("hide")}.bind(this))}else{this.getRoot().removeClass("show").addClass("hide")}this.root.trigger(h.hidden,this)}.bind(this))};o.prototype.destroy=function(){this.hide();this.root.remove();this.root.trigger(h.destroyed,this)};o.prototype.accessibilityShow=function(){a("body").children().each(function(b,c){if(!this.root.is(c)){c=a(c);var d=c.attr("aria-hidden");if("true"!==d){c.data("previous-aria-hidden",d);this.hiddenSiblings.push(c);c.attr("aria-hidden","true")}}}.bind(this));this.root.attr("aria-hidden","false")};o.prototype.accessibilityHide=function(){this.root.attr("aria-hidden","true");a.each(this.hiddenSiblings,function(b,c){c=a(c);var d=c.data("previous-aria-hidden");if("undefined"==typeof d){c.removeAttr("aria-hidden")}else{c.attr("aria-hidden",d)}});this.hiddenSiblings=[]};o.prototype.registerEventListeners=function(){this.getRoot().on("keydown",function(a){if(!this.isVisible()){return}if(a.keyCode==d.escape){this.hide()}}.bind(this));this.getRoot().click(function(b){if(!a(b.target).closest(k.MODAL).length){if(a(b.target).closest(k.CONTAINER).length){this.hideIfNotForm()}}}.bind(this));e.define(this.getModal(),[e.events.activate]);this.getModal().on(e.events.activate,k.HIDE,function(a,b){this.hide();b.originalEvent.preventDefault()}.bind(this))};o.prototype.registerCloseOnCancel=function(){this.getModal().on(e.events.activate,this.getActionSelector("cancel"),function(b,c){var d=a.Event(h.cancel);this.getRoot().trigger(d,this);if(!d.isDefaultPrevented()){c.originalEvent.preventDefault();if(this.removeOnClose){this.destroy()}else{this.hide()}}}.bind(this))};o.prototype.registerCloseOnSave=function(){this.getModal().on(e.events.activate,this.getActionSelector("save"),function(b,c){var d=a.Event(h.save);this.getRoot().trigger(d,this);if(!d.isDefaultPrevented()){c.originalEvent.preventDefault();if(this.removeOnClose){this.destroy()}else{this.hide()}}}.bind(this))};o.prototype.asyncSet=function(b,d){var e=b;if("object"!==_typeof(b)||!b.hasOwnProperty("then")){e=a.Deferred();e.resolve(b)}e.then(function(a){d(a)}).fail(c.exception);return e};o.prototype.setButtonText=function(a,b){var c=this.getFooter().find(this.getActionSelector(a));if(!c){throw new Error("Unable to find the '"+a+"' button")}return this.asyncSet(b,c.text.bind(c))};o.prototype.getActionSelector=function(a){return"[data-action='"+a+"']"};o.prototype.setRemoveOnClose=function(a){this.removeOnClose=a};return o});
+function _typeof(a){"@babel/helpers - typeof";if("function"==typeof Symbol&&"symbol"==typeof Symbol.iterator){_typeof=function(a){return typeof a}}else{_typeof=function(a){return a&&"function"==typeof Symbol&&a.constructor===Symbol&&a!==Symbol.prototype?"symbol":typeof a}}return _typeof(a)}define ("core/modal",["jquery","core/templates","core/notification","core/key_codes","core/custom_interaction_events","core/modal_backdrop","core/event","core/modal_events","core/local/aria/focuslock","core/pending","core/aria"],function(a,b,c,d,e,f,g,h,i,j,k){var l={CONTAINER:"[data-region=\"modal-container\"]",MODAL:"[data-region=\"modal\"]",HEADER:"[data-region=\"header\"]",TITLE:"[data-region=\"title\"]",BODY:"[data-region=\"body\"]",FOOTER:"[data-region=\"footer\"]",HIDE:"[data-action=\"hide\"]",DIALOG:"[role=dialog]",FORM:"form",MENU_BAR:"[role=menubar]",HAS_Z_INDEX:".moodle-has-zindex",CAN_RECEIVE_FOCUS:"input:not([type=\"hidden\"]), a[href], button, textarea, select, [tabindex]"},m={LOADING:"core/loading",BACKDROP:"core/modal_backdrop"},n,o=0,p=function(b){this.root=a(b);this.modal=this.root.find(l.MODAL);this.header=this.modal.find(l.HEADER);this.headerPromise=a.Deferred();this.title=this.header.find(l.TITLE);this.titlePromise=a.Deferred();this.body=this.modal.find(l.BODY);this.bodyPromise=a.Deferred();this.footer=this.modal.find(l.FOOTER);this.footerPromise=a.Deferred();this.hiddenSiblings=[];this.isAttached=!1;this.bodyJS=null;this.footerJS=null;this.modalCount=o++;if(!this.root.is(l.CONTAINER)){c.exception({message:"Element is not a modal container"})}if(!this.modal.length){c.exception({message:"Container does not contain a modal"})}if(!this.header.length){c.exception({message:"Modal is missing a header region"})}if(!this.title.length){c.exception({message:"Modal header is missing a title region"})}if(!this.body.length){c.exception({message:"Modal is missing a body region"})}if(!this.footer.length){c.exception({message:"Modal is missing a footer region"})}this.registerEventListeners()};p.prototype.attachToDOM=function(){if(this.isAttached){return}a("body").append(this.root);i.trapFocus(this.root[0]);if(this.bodyJS){b.runTemplateJS(this.bodyJS);this.bodyJS=null}if(this.footerJS){b.runTemplateJS(this.footerJS);this.footerJS=null}this.isAttached=!0};p.prototype.countOtherVisibleModals=function(){var b=0;a("body").find(l.CONTAINER).each(function(c,d){d=a(d);if(!this.root.is(d)&&d.hasClass("show")){b++}}.bind(this));return b};p.prototype.getBackdrop=function(){if(!n){n=b.render(m.BACKDROP,{}).then(function(b){var c=a(b);return new f(c)}).fail(c.exception)}return n};p.prototype.getRoot=function(){return this.root};p.prototype.getModal=function(){return this.modal};p.prototype.getTitle=function(){return this.title};p.prototype.getBody=function(){return this.body};p.prototype.getFooter=function(){return this.footer};p.prototype.getTitlePromise=function(){return this.titlePromise};p.prototype.getBodyPromise=function(){return this.bodyPromise};p.prototype.getFooterPromise=function(){return this.footerPromise};p.prototype.getModalCount=function(){return this.modalCount};p.prototype.setTitle=function(b){var d=this.getTitle();this.titlePromise=a.Deferred();this.asyncSet(b,d.html.bind(d)).then(function(){this.titlePromise.resolve(d)}.bind(this)).catch(c.exception)};p.prototype.setBody=function(d){this.bodyPromise=a.Deferred();var e=this.getBody();if("string"==typeof d){e.html(d);g.notifyFilterContentUpdated(e);this.getRoot().trigger(h.bodyRendered,this);this.bodyPromise.resolve(e)}else{var f="amd-modal-js-pending-id-"+this.getModalCount();M.util.js_pending(f);var i=null;e.css("overflow","hidden");d=a.when(d);if("pending"==d.state()){var j=e.innerHeight();if(100>j){j=100}e.animate({height:j+"px"},150);e.html("");i=b.render(m.LOADING,{}).then(function(b){var c=a(b).hide();e.html(c);c.fadeIn(150);return a.when(c.promise(),d)}).then(function(a){return a.fadeOut(100).promise()}).then(function(){return d})}else{i=d}i.then(function(a,c){var d=null;if(this.isVisible()){e.css("opacity",0);var f=e.innerHeight();e.html(a);e.css("height","");var g=e.innerHeight();e.css("height",f+"px");d=e.animate({height:g+"px",opacity:1},{duration:150,queue:!1}).promise()}else{e.html(a)}if(c){if(this.isAttached){b.runTemplateJS(c)}else{this.bodyJS=c}}return d}.bind(this)).then(function(a){g.notifyFilterContentUpdated(e);this.getRoot().trigger(h.bodyRendered,this);return a}.bind(this)).then(function(){this.bodyPromise.resolve(e)}.bind(this)).fail(c.exception).always(function(){e.css("height","");e.css("overflow","");e.css("opacity","");M.util.js_complete(f)}).fail(c.exception)}};p.prototype.setFooter=function(d){this.showFooter();this.footerPromise=a.Deferred();var e=this.getFooter();if("string"==typeof d){e.html(d);this.footerPromise.resolve(e)}else{b.render(m.LOADING,{}).then(function(a){e.html(a);return d}).then(function(a,c){e.html(a);if(c){if(this.isAttached){b.runTemplateJS(c)}else{this.footerJS=c}}return e}.bind(this)).then(function(a){this.footerPromise.resolve(a)}.bind(this)).catch(c.exception)}};p.prototype.hasFooterContent=function(){return this.getFooter().children().length?!0:!1};p.prototype.hideFooter=function(){this.getFooter().addClass("hidden")};p.prototype.showFooter=function(){this.getFooter().removeClass("hidden")};p.prototype.setLarge=function(){if(this.isLarge()){return}this.getModal().addClass("modal-lg")};p.prototype.isLarge=function(){return this.getModal().hasClass("modal-lg")};p.prototype.setSmall=function(){if(this.isSmall()){return}this.getModal().removeClass("modal-lg")};p.prototype.isSmall=function(){return!this.getModal().hasClass("modal-lg")};p.prototype.setScrollable=function(a){if(!a){this.getModal()[0].classList.remove("modal-dialog-scrollable");return}this.getModal()[0].classList.add("modal-dialog-scrollable")};p.prototype.calculateZIndex=function(){var b=a(l.DIALOG+", "+l.MENU_BAR+", "+l.HAS_Z_INDEX),c=parseInt(this.root.css("z-index"));b.each(function(b,d){d=a(d);var e=d.css("z-index")?parseInt(d.css("z-index")):0;if(e>c){c=e}});return c};p.prototype.isVisible=function(){return this.root.hasClass("show")};p.prototype.hasFocus=function(){var b=a(document.activeElement);return this.root.is(b)||this.root.has(b).length};p.prototype.hasTransitions=function(){return this.getRoot().hasClass("fade")};p.prototype.show=function(){if(this.isVisible()){return a.Deferred().resolve()}var b=new j("core/modal:show");if(this.hasFooterContent()){this.showFooter()}else{this.hideFooter()}if(!this.isAttached){this.attachToDOM()}return this.getBackdrop().then(function(b){var c=this.calculateZIndex(),d=c+2;this.root.css("z-index",d);b.setZIndex(d-1);b.show();this.root.removeClass("hide").addClass("show");this.accessibilityShow();this.getModal().focus();a("body").addClass("modal-open");this.root.trigger(h.shown,this)}.bind(this)).then(b.resolve)};p.prototype.hideIfNotForm=function(){var a=this.modal.find(l.FORM);if(0==a.length){this.hide()}};p.prototype.hide=function(){this.getBackdrop().done(function(b){i.untrapFocus();if(!this.countOtherVisibleModals()){b.hide();a("body").removeClass("modal-open")}var c=parseInt(this.root.css("z-index"));this.root.css("z-index","");b.setZIndex(c-3);this.accessibilityHide();if(this.hasTransitions()){this.getRoot().one("transitionend webkitTransitionEnd oTransitionEnd",function(){this.getRoot().removeClass("show").addClass("hide")}.bind(this))}else{this.getRoot().removeClass("show").addClass("hide")}this.root.trigger(h.hidden,this)}.bind(this))};p.prototype.destroy=function(){this.hide();this.root.remove();this.root.trigger(h.destroyed,this)};p.prototype.accessibilityShow=function(){k.hideSiblings(this.root.get()[0]);this.root.removeAttr("aria-hidden")};p.prototype.accessibilityHide=function(){this.root.attr("aria-hidden","true");k.unhideSiblings(this.root.get()[0])};p.prototype.registerEventListeners=function(){this.getRoot().on("keydown",function(a){if(!this.isVisible()){return}if(a.keyCode==d.escape){this.hide()}}.bind(this));this.getRoot().click(function(b){if(!a(b.target).closest(l.MODAL).length){if(a(b.target).closest(l.CONTAINER).length){this.hideIfNotForm()}}}.bind(this));e.define(this.getModal(),[e.events.activate]);this.getModal().on(e.events.activate,l.HIDE,function(a,b){this.hide();b.originalEvent.preventDefault()}.bind(this))};p.prototype.registerCloseOnCancel=function(){this.getModal().on(e.events.activate,this.getActionSelector("cancel"),function(b,c){var d=a.Event(h.cancel);this.getRoot().trigger(d,this);if(!d.isDefaultPrevented()){c.originalEvent.preventDefault();if(this.removeOnClose){this.destroy()}else{this.hide()}}}.bind(this))};p.prototype.registerCloseOnSave=function(){this.getModal().on(e.events.activate,this.getActionSelector("save"),function(b,c){var d=a.Event(h.save);this.getRoot().trigger(d,this);if(!d.isDefaultPrevented()){c.originalEvent.preventDefault();if(this.removeOnClose){this.destroy()}else{this.hide()}}}.bind(this))};p.prototype.asyncSet=function(b,d){var e=b;if("object"!==_typeof(b)||!b.hasOwnProperty("then")){e=a.Deferred();e.resolve(b)}e.then(function(a){d(a)}).fail(c.exception);return e};p.prototype.setButtonText=function(a,b){var c=this.getFooter().find(this.getActionSelector(a));if(!c){throw new Error("Unable to find the '"+a+"' button")}return this.asyncSet(b,c.text.bind(c))};p.prototype.getActionSelector=function(a){return"[data-action='"+a+"']"};p.prototype.setRemoveOnClose=function(a){this.removeOnClose=a};return p});
 //# sourceMappingURL=modal.min.js.map
diff --git a/lib/amd/build/modal.min.js.map b/lib/amd/build/modal.min.js.map
index 19c89db0477..297ee6cf62b 100644
--- a/lib/amd/build/modal.min.js.map
+++ b/lib/amd/build/modal.min.js.map
@@ -1 +1 @@
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This file is part of Moodle - 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 * Contain the logic for modals.\n *\n * @module     core/modal\n * @class      modal\n * @package    core\n * @copyright  2016 Ryan Wyllie <ryan@moodle.com>\n * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later\n */\ndefine([\n    'jquery',\n    'core/templates',\n    'core/notification',\n    'core/key_codes',\n    'core/custom_interaction_events',\n    'core/modal_backdrop',\n    'core/event',\n    'core/modal_events',\n    'core/local/aria/focuslock',\n    'core/pending',\n], function($, Templates, Notification, KeyCodes, CustomEvents, ModalBackdrop, Event, ModalEvents, FocusLock, Pending) {\n\n    var SELECTORS = {\n        CONTAINER: '[data-region=\"modal-container\"]',\n        MODAL: '[data-region=\"modal\"]',\n        HEADER: '[data-region=\"header\"]',\n        TITLE: '[data-region=\"title\"]',\n        BODY: '[data-region=\"body\"]',\n        FOOTER: '[data-region=\"footer\"]',\n        HIDE: '[data-action=\"hide\"]',\n        DIALOG: '[role=dialog]',\n        FORM: 'form',\n        MENU_BAR: '[role=menubar]',\n        HAS_Z_INDEX: '.moodle-has-zindex',\n        CAN_RECEIVE_FOCUS: 'input:not([type=\"hidden\"]), a[href], button, textarea, select, [tabindex]',\n    };\n\n    var TEMPLATES = {\n        LOADING: 'core/loading',\n        BACKDROP: 'core/modal_backdrop',\n    };\n\n    /**\n     * Module singleton for the backdrop to be reused by all Modal instances.\n     */\n    var backdropPromise;\n\n    /**\n     * A counter that gets incremented for each modal created. This can be\n     * used to generate unique values for the modals.\n     */\n    var modalCounter = 0;\n\n    /**\n     * Constructor for the Modal.\n     *\n     * @param {object} root The root jQuery element for the modal\n     */\n    var Modal = function(root) {\n        this.root = $(root);\n        this.modal = this.root.find(SELECTORS.MODAL);\n        this.header = this.modal.find(SELECTORS.HEADER);\n        this.headerPromise = $.Deferred();\n        this.title = this.header.find(SELECTORS.TITLE);\n        this.titlePromise = $.Deferred();\n        this.body = this.modal.find(SELECTORS.BODY);\n        this.bodyPromise = $.Deferred();\n        this.footer = this.modal.find(SELECTORS.FOOTER);\n        this.footerPromise = $.Deferred();\n        this.hiddenSiblings = [];\n        this.isAttached = false;\n        this.bodyJS = null;\n        this.footerJS = null;\n        this.modalCount = modalCounter++;\n\n        if (!this.root.is(SELECTORS.CONTAINER)) {\n            Notification.exception({message: 'Element is not a modal container'});\n        }\n\n        if (!this.modal.length) {\n            Notification.exception({message: 'Container does not contain a modal'});\n        }\n\n        if (!this.header.length) {\n            Notification.exception({message: 'Modal is missing a header region'});\n        }\n\n        if (!this.title.length) {\n            Notification.exception({message: 'Modal header is missing a title region'});\n        }\n\n        if (!this.body.length) {\n            Notification.exception({message: 'Modal is missing a body region'});\n        }\n\n        if (!this.footer.length) {\n            Notification.exception({message: 'Modal is missing a footer region'});\n        }\n\n        this.registerEventListeners();\n    };\n\n    /**\n     * Add the modal to the page, if it hasn't already been added. This includes running any\n     * javascript that has been cached until now.\n     *\n     * @method attachToDOM\n     */\n    Modal.prototype.attachToDOM = function() {\n        if (this.isAttached) {\n            return;\n        }\n\n        $('body').append(this.root);\n        FocusLock.trapFocus(this.root[0]);\n\n        // If we'd cached any JS then we can run it how that the modal is\n        // attached to the DOM.\n        if (this.bodyJS) {\n            Templates.runTemplateJS(this.bodyJS);\n            this.bodyJS = null;\n        }\n\n        if (this.footerJS) {\n            Templates.runTemplateJS(this.footerJS);\n            this.footerJS = null;\n        }\n\n        this.isAttached = true;\n    };\n\n    /**\n     * Count the number of other visible modals (not including this one).\n     *\n     * @method countOtherVisibleModals\n     * @return {int}\n     */\n    Modal.prototype.countOtherVisibleModals = function() {\n        var count = 0;\n        $('body').find(SELECTORS.CONTAINER).each(function(index, element) {\n            element = $(element);\n\n            // If we haven't found ourself and the element is visible.\n            if (!this.root.is(element) && element.hasClass('show')) {\n                count++;\n            }\n        }.bind(this));\n\n        return count;\n    };\n\n    /**\n     * Get the modal backdrop.\n     *\n     * @method getBackdrop\n     * @return {object} jQuery promise\n     */\n    Modal.prototype.getBackdrop = function() {\n        if (!backdropPromise) {\n            backdropPromise = Templates.render(TEMPLATES.BACKDROP, {})\n                .then(function(html) {\n                    var element = $(html);\n\n                    return new ModalBackdrop(element);\n                })\n                .fail(Notification.exception);\n        }\n\n        return backdropPromise;\n    };\n\n    /**\n     * Get the root element of this modal.\n     *\n     * @method getRoot\n     * @return {object} jQuery object\n     */\n    Modal.prototype.getRoot = function() {\n        return this.root;\n    };\n\n    /**\n     * Get the modal element of this modal.\n     *\n     * @method getModal\n     * @return {object} jQuery object\n     */\n    Modal.prototype.getModal = function() {\n        return this.modal;\n    };\n\n    /**\n     * Get the modal title element.\n     *\n     * @method getTitle\n     * @return {object} jQuery object\n     */\n    Modal.prototype.getTitle = function() {\n        return this.title;\n    };\n\n    /**\n     * Get the modal body element.\n     *\n     * @method getBody\n     * @return {object} jQuery object\n     */\n    Modal.prototype.getBody = function() {\n        return this.body;\n    };\n\n    /**\n     * Get the modal footer element.\n     *\n     * @method getFooter\n     * @return {object} jQuery object\n     */\n    Modal.prototype.getFooter = function() {\n        return this.footer;\n    };\n\n    /**\n     * Get a promise resolving to the title region.\n     *\n     * @method getTitlePromise\n     * @return {Promise}\n     */\n    Modal.prototype.getTitlePromise = function() {\n        return this.titlePromise;\n    };\n\n    /**\n     * Get a promise resolving to the body region.\n     *\n     * @method getBodyPromise\n     * @return {object} jQuery object\n     */\n    Modal.prototype.getBodyPromise = function() {\n        return this.bodyPromise;\n    };\n\n    /**\n     * Get a promise resolving to the footer region.\n     *\n     * @method getFooterPromise\n     * @return {object} jQuery object\n     */\n    Modal.prototype.getFooterPromise = function() {\n        return this.footerPromise;\n    };\n\n    /**\n     * Get the unique modal count.\n     *\n     * @method getModalCount\n     * @return {int}\n     */\n    Modal.prototype.getModalCount = function() {\n        return this.modalCount;\n    };\n\n    /**\n     * Set the modal title element.\n     *\n     * This method is overloaded to take either a string value for the title or a jQuery promise that is resolved with\n     * HTML most commonly from a Str.get_string call.\n     *\n     * @method setTitle\n     * @param {(string|object)} value The title string or jQuery promise which resolves to the title.\n     */\n    Modal.prototype.setTitle = function(value) {\n        var title = this.getTitle();\n        this.titlePromise = $.Deferred();\n\n        this.asyncSet(value, title.html.bind(title))\n        .then(function() {\n            this.titlePromise.resolve(title);\n        }.bind(this))\n        .catch(Notification.exception);\n    };\n\n    /**\n     * Set the modal body element.\n     *\n     * This method is overloaded to take either a string value for the body or a jQuery promise that is resolved with\n     * HTML and Javascript most commonly from a Templates.render call.\n     *\n     * @method setBody\n     * @param {(string|object)} value The body string or jQuery promise which resolves to the body.\n     */\n    Modal.prototype.setBody = function(value) {\n        this.bodyPromise = $.Deferred();\n\n        var body = this.getBody();\n\n        if (typeof value === 'string') {\n            // Just set the value if it's a string.\n            body.html(value);\n            Event.notifyFilterContentUpdated(body);\n            this.getRoot().trigger(ModalEvents.bodyRendered, this);\n            this.bodyPromise.resolve(body);\n        } else {\n            var jsPendingId = 'amd-modal-js-pending-id-' + this.getModalCount();\n            M.util.js_pending(jsPendingId);\n            // Otherwise we assume it's a promise to be resolved with\n            // html and javascript.\n            var contentPromise = null;\n            body.css('overflow', 'hidden');\n\n            // Ensure that the `value` is a jQuery Promise.\n            value = $.when(value);\n\n            if (value.state() == 'pending') {\n                // We're still waiting for the body promise to resolve so\n                // let's show a loading icon.\n                var height = body.innerHeight();\n                if (height < 100) {\n                    height = 100;\n                }\n\n                body.animate({height: height + 'px'}, 150);\n\n                body.html('');\n                contentPromise = Templates.render(TEMPLATES.LOADING, {})\n                    .then(function(html) {\n                        var loadingIcon = $(html).hide();\n                        body.html(loadingIcon);\n                        loadingIcon.fadeIn(150);\n\n                        // We only want the loading icon to fade out\n                        // when the content for the body has finished\n                        // loading.\n                        return $.when(loadingIcon.promise(), value);\n                    })\n                    .then(function(loadingIcon) {\n                        // Once the content has finished loading and\n                        // the loading icon has been shown then we can\n                        // fade the icon away to reveal the content.\n                        return loadingIcon.fadeOut(100).promise();\n                    })\n                    .then(function() {\n                        return value;\n                    });\n            } else {\n                // The content is already loaded so let's just display\n                // it to the user. No need for a loading icon.\n                contentPromise = value;\n            }\n\n            // Now we can actually display the content.\n            contentPromise.then(function(html, js) {\n                var result = null;\n\n                if (this.isVisible()) {\n                    // If the modal is visible then we should display\n                    // the content gracefully for the user.\n                    body.css('opacity', 0);\n                    var currentHeight = body.innerHeight();\n                    body.html(html);\n                    // We need to clear any height values we've set here\n                    // in order to measure the height of the content being\n                    // added. This then allows us to animate the height\n                    // transition.\n                    body.css('height', '');\n                    var newHeight = body.innerHeight();\n                    body.css('height', currentHeight + 'px');\n                    result = body.animate(\n                        {height: newHeight + 'px', opacity: 1},\n                        {duration: 150, queue: false}\n                    ).promise();\n                } else {\n                    // Since the modal isn't visible we can just immediately\n                    // set the content. No need to animate it.\n                    body.html(html);\n                }\n\n                if (js) {\n                    if (this.isAttached) {\n                        // If we're in the DOM then run the JS immediately.\n                        Templates.runTemplateJS(js);\n                    } else {\n                        // Otherwise cache it to be run when we're attached.\n                        this.bodyJS = js;\n                    }\n                }\n\n                return result;\n            }.bind(this))\n            .then(function(result) {\n                Event.notifyFilterContentUpdated(body);\n                this.getRoot().trigger(ModalEvents.bodyRendered, this);\n                return result;\n            }.bind(this))\n            .then(function() {\n                this.bodyPromise.resolve(body);\n                return;\n            }.bind(this))\n            .fail(Notification.exception)\n            .always(function() {\n                // When we're done displaying all of the content we need\n                // to clear the custom values we've set here.\n                body.css('height', '');\n                body.css('overflow', '');\n                body.css('opacity', '');\n                M.util.js_complete(jsPendingId);\n\n                return;\n            })\n            .fail(Notification.exception);\n        }\n    };\n\n    /**\n     * Set the modal footer element. The footer element is made visible, if it\n     * isn't already.\n     *\n     * This method is overloaded to take either a string\n     * value for the body or a jQuery promise that is resolved with HTML and Javascript\n     * most commonly from a Templates.render call.\n     *\n     * @method setFooter\n     * @param {(string|object)} value The footer string or jQuery promise\n     */\n    Modal.prototype.setFooter = function(value) {\n        // Make sure the footer is visible.\n        this.showFooter();\n        this.footerPromise = $.Deferred();\n\n        var footer = this.getFooter();\n\n        if (typeof value === 'string') {\n            // Just set the value if it's a string.\n            footer.html(value);\n            this.footerPromise.resolve(footer);\n        } else {\n            // Otherwise we assume it's a promise to be resolved with\n            // html and javascript.\n            Templates.render(TEMPLATES.LOADING, {})\n            .then(function(html) {\n                footer.html(html);\n\n                return value;\n            })\n            .then(function(html, js) {\n                footer.html(html);\n\n                if (js) {\n                    if (this.isAttached) {\n                        // If we're in the DOM then run the JS immediately.\n                        Templates.runTemplateJS(js);\n                    } else {\n                        // Otherwise cache it to be run when we're attached.\n                        this.footerJS = js;\n                    }\n                }\n\n                return footer;\n            }.bind(this))\n            .then(function(footer) {\n                this.footerPromise.resolve(footer);\n                return;\n            }.bind(this))\n            .catch(Notification.exception);\n        }\n    };\n\n    /**\n     * Check if the footer has any content in it.\n     *\n     * @method hasFooterContent\n     * @return {bool}\n     */\n    Modal.prototype.hasFooterContent = function() {\n        return this.getFooter().children().length ? true : false;\n    };\n\n    /**\n     * Hide the footer element.\n     *\n     * @method hideFooter\n     */\n    Modal.prototype.hideFooter = function() {\n        this.getFooter().addClass('hidden');\n    };\n\n    /**\n     * Show the footer element.\n     *\n     * @method showFooter\n     */\n    Modal.prototype.showFooter = function() {\n        this.getFooter().removeClass('hidden');\n    };\n\n    /**\n     * Mark the modal as a large modal.\n     *\n     * @method setLarge\n     */\n    Modal.prototype.setLarge = function() {\n        if (this.isLarge()) {\n            return;\n        }\n\n        this.getModal().addClass('modal-lg');\n    };\n\n    /**\n     * Check if the modal is a large modal.\n     *\n     * @method isLarge\n     * @return {bool}\n     */\n    Modal.prototype.isLarge = function() {\n        return this.getModal().hasClass('modal-lg');\n    };\n\n    /**\n     * Mark the modal as a small modal.\n     *\n     * @method setSmall\n     */\n    Modal.prototype.setSmall = function() {\n        if (this.isSmall()) {\n            return;\n        }\n\n        this.getModal().removeClass('modal-lg');\n    };\n\n    /**\n     * Check if the modal is a small modal.\n     *\n     * @method isSmall\n     * @return {bool}\n     */\n    Modal.prototype.isSmall = function() {\n        return !this.getModal().hasClass('modal-lg');\n    };\n\n    /**\n     * Set this modal to be scrollable or not.\n     *\n     * @method setScrollable\n     * @param {bool} value Whether the modal is scrollable or not\n     */\n    Modal.prototype.setScrollable = function(value) {\n        if (!value) {\n            this.getModal()[0].classList.remove('modal-dialog-scrollable');\n            return;\n        }\n\n        this.getModal()[0].classList.add('modal-dialog-scrollable');\n    };\n\n\n    /**\n     * Determine the highest z-index value currently on the page.\n     *\n     * @method calculateZIndex\n     * @return {int}\n     */\n    Modal.prototype.calculateZIndex = function() {\n        var items = $(SELECTORS.DIALOG + ', ' + SELECTORS.MENU_BAR + ', ' + SELECTORS.HAS_Z_INDEX);\n        var zIndex = parseInt(this.root.css('z-index'));\n\n        items.each(function(index, item) {\n            item = $(item);\n            // Note that webkit browsers won't return the z-index value from the CSS stylesheet\n            // if the element doesn't have a position specified. Instead it'll return \"auto\".\n            var itemZIndex = item.css('z-index') ? parseInt(item.css('z-index')) : 0;\n\n            if (itemZIndex > zIndex) {\n                zIndex = itemZIndex;\n            }\n        });\n\n        return zIndex;\n    };\n\n    /**\n     * Check if this modal is visible.\n     *\n     * @method isVisible\n     * @return {bool}\n     */\n    Modal.prototype.isVisible = function() {\n        return this.root.hasClass('show');\n    };\n\n    /**\n     * Check if this modal has focus.\n     *\n     * @method hasFocus\n     * @return {bool}\n     */\n    Modal.prototype.hasFocus = function() {\n        var target = $(document.activeElement);\n        return this.root.is(target) || this.root.has(target).length;\n    };\n\n    /**\n     * Check if this modal has CSS transitions applied.\n     *\n     * @method hasTransitions\n     * @return {bool}\n     */\n    Modal.prototype.hasTransitions = function() {\n        return this.getRoot().hasClass('fade');\n    };\n\n    /**\n     * Display this modal. The modal will be attached to the DOM if it hasn't\n     * already been.\n     *\n     * @method show\n     * @returns {Promise}\n     */\n    Modal.prototype.show = function() {\n        if (this.isVisible()) {\n            return $.Deferred().resolve();\n        }\n\n        var pendingPromise = new Pending('core/modal:show');\n\n        if (this.hasFooterContent()) {\n            this.showFooter();\n        } else {\n            this.hideFooter();\n        }\n\n        if (!this.isAttached) {\n            this.attachToDOM();\n        }\n\n        return this.getBackdrop()\n        .then(function(backdrop) {\n            var currentIndex = this.calculateZIndex();\n            var newIndex = currentIndex + 2;\n            var newBackdropIndex = newIndex - 1;\n            this.root.css('z-index', newIndex);\n            backdrop.setZIndex(newBackdropIndex);\n            backdrop.show();\n\n            this.root.removeClass('hide').addClass('show');\n            this.accessibilityShow();\n            this.getModal().focus();\n            $('body').addClass('modal-open');\n            this.root.trigger(ModalEvents.shown, this);\n\n            return;\n        }.bind(this))\n        .then(pendingPromise.resolve);\n    };\n\n    /**\n     * Hide this modal if it does not contain a form.\n     *\n     * @method hideIfNotForm\n     */\n    Modal.prototype.hideIfNotForm = function() {\n        var formElement = this.modal.find(SELECTORS.FORM);\n        if (formElement.length == 0) {\n            this.hide();\n        }\n    };\n\n    /**\n     * Hide this modal.\n     *\n     * @method hide\n     */\n    Modal.prototype.hide = function() {\n        this.getBackdrop().done(function(backdrop) {\n            FocusLock.untrapFocus();\n            if (!this.countOtherVisibleModals()) {\n                // Hide the backdrop if we're the last open modal.\n                backdrop.hide();\n                $('body').removeClass('modal-open');\n            }\n\n            var currentIndex = parseInt(this.root.css('z-index'));\n            this.root.css('z-index', '');\n            backdrop.setZIndex(currentIndex - 3);\n\n            this.accessibilityHide();\n\n            if (this.hasTransitions()) {\n                // Wait for CSS transitions to complete before hiding the element.\n                this.getRoot().one('transitionend webkitTransitionEnd oTransitionEnd', function() {\n                    this.getRoot().removeClass('show').addClass('hide');\n                }.bind(this));\n            } else {\n                this.getRoot().removeClass('show').addClass('hide');\n            }\n\n            this.root.trigger(ModalEvents.hidden, this);\n        }.bind(this));\n    };\n\n    /**\n     * Remove this modal from the DOM.\n     *\n     * @method destroy\n     */\n    Modal.prototype.destroy = function() {\n        this.hide();\n        this.root.remove();\n        this.root.trigger(ModalEvents.destroyed, this);\n    };\n\n    /**\n     * Sets the appropriate aria attributes on this dialogue and the other\n     * elements in the DOM to ensure that screen readers are able to navigate\n     * the dialogue popup correctly.\n     *\n     * @method accessibilityShow\n     */\n    Modal.prototype.accessibilityShow = function() {\n        // We need to get a list containing each sibling element and the shallowest\n        // non-ancestral nodes in the DOM. We can shortcut this a little by leveraging\n        // the fact that this dialogue is always appended to the document body therefore\n        // it's siblings are the shallowest non-ancestral nodes. If that changes then\n        // this code should also be updated.\n        $('body').children().each(function(index, child) {\n            // Skip the current modal.\n            if (!this.root.is(child)) {\n                child = $(child);\n                var hidden = child.attr('aria-hidden');\n                // If they are already hidden we can ignore them.\n                if (hidden !== 'true') {\n                    // Save their current state.\n                    child.data('previous-aria-hidden', hidden);\n                    this.hiddenSiblings.push(child);\n\n                    // Hide this node from screen readers.\n                    child.attr('aria-hidden', 'true');\n                }\n            }\n        }.bind(this));\n\n        // Make us visible to screen readers.\n        this.root.attr('aria-hidden', 'false');\n    };\n\n    /**\n     * Restores the aria visibility on the DOM elements changed when displaying\n     * the dialogue popup and makes the dialogue aria hidden to allow screen\n     * readers to navigate the main page correctly when the dialogue is closed.\n     *\n     * @method accessibilityHide\n     */\n    Modal.prototype.accessibilityHide = function() {\n        this.root.attr('aria-hidden', 'true');\n\n        // Restore the sibling nodes back to their original values.\n        $.each(this.hiddenSiblings, function(index, sibling) {\n            sibling = $(sibling);\n            var previousValue = sibling.data('previous-aria-hidden');\n            // If the element didn't previously have an aria-hidden attribute\n            // then we can just remove the one we set.\n            if (typeof previousValue == 'undefined') {\n                sibling.removeAttr('aria-hidden');\n            } else {\n                // Otherwise set it back to the old value (which will be false).\n                sibling.attr('aria-hidden', previousValue);\n            }\n        });\n\n        // Clear the cache. No longer need to store these.\n        this.hiddenSiblings = [];\n    };\n\n    /**\n     * Set up all of the event handling for the modal.\n     *\n     * @method registerEventListeners\n     */\n    Modal.prototype.registerEventListeners = function() {\n        this.getRoot().on('keydown', function(e) {\n            if (!this.isVisible()) {\n                return;\n            }\n\n            if (e.keyCode == KeyCodes.escape) {\n                this.hide();\n            }\n        }.bind(this));\n\n        // Listen for clicks on the modal container.\n        this.getRoot().click(function(e) {\n            // If the click wasn't inside the modal element then we should\n            // hide the modal.\n            if (!$(e.target).closest(SELECTORS.MODAL).length) {\n                // The check above fails to detect the click was inside the modal when the DOM tree is already changed.\n                // So, we check if we can still find the container element or not. If not, then the DOM tree is changed.\n                // It's best not to hide the modal in that case.\n                if ($(e.target).closest(SELECTORS.CONTAINER).length) {\n                    this.hideIfNotForm();\n                }\n            }\n        }.bind(this));\n\n        CustomEvents.define(this.getModal(), [CustomEvents.events.activate]);\n        this.getModal().on(CustomEvents.events.activate, SELECTORS.HIDE, function(e, data) {\n            this.hide();\n            data.originalEvent.preventDefault();\n        }.bind(this));\n    };\n\n    /**\n     * Register a listener to close the dialogue when the cancel button is pressed.\n     *\n     * @method registerCloseOnCancel\n     */\n    Modal.prototype.registerCloseOnCancel = function() {\n        // Handle the clicking of the Cancel button.\n        this.getModal().on(CustomEvents.events.activate, this.getActionSelector('cancel'), function(e, data) {\n            var cancelEvent = $.Event(ModalEvents.cancel);\n            this.getRoot().trigger(cancelEvent, this);\n\n            if (!cancelEvent.isDefaultPrevented()) {\n                data.originalEvent.preventDefault();\n\n                if (this.removeOnClose) {\n                    this.destroy();\n                } else {\n                    this.hide();\n                }\n            }\n        }.bind(this));\n    };\n\n    /**\n     * Register a listener to close the dialogue when the save button is pressed.\n     *\n     * @method registerCloseOnSave\n     */\n    Modal.prototype.registerCloseOnSave = function() {\n        // Handle the clicking of the Cancel button.\n        this.getModal().on(CustomEvents.events.activate, this.getActionSelector('save'), function(e, data) {\n            var saveEvent = $.Event(ModalEvents.save);\n            this.getRoot().trigger(saveEvent, this);\n\n            if (!saveEvent.isDefaultPrevented()) {\n                data.originalEvent.preventDefault();\n\n                if (this.removeOnClose) {\n                    this.destroy();\n                } else {\n                    this.hide();\n                }\n            }\n        }.bind(this));\n    };\n\n    /**\n     * Set or resolve and set the value using the function.\n     *\n     * @method asyncSet\n     * @param {(string|object)} value The string or jQuery promise.\n     * @param {function} setFunction The setter\n     * @return {Promise}\n     */\n    Modal.prototype.asyncSet = function(value, setFunction) {\n        var p = value;\n        if (typeof value !== 'object' || !value.hasOwnProperty('then')) {\n            p = $.Deferred();\n            p.resolve(value);\n        }\n\n        p.then(function(content) {\n            setFunction(content);\n\n            return;\n        })\n        .fail(Notification.exception);\n\n        return p;\n    };\n\n    /**\n     * Set the title text of a button.\n     *\n     * This method is overloaded to take either a string value for the button title or a jQuery promise that is resolved with\n     * text most commonly from a Str.get_string call.\n     *\n     * @param {DOMString} action The action of the button\n     * @param {(String|object)} value The button text, or a promise which will resolve to it\n     * @returns {Promise}\n     */\n    Modal.prototype.setButtonText = function(action, value) {\n        const button = this.getFooter().find(this.getActionSelector(action));\n\n        if (!button) {\n            throw new Error(\"Unable to find the '\" + action + \"' button\");\n        }\n\n        return this.asyncSet(value, button.text.bind(button));\n    };\n\n    /**\n     * Get the Selector for an action.\n     *\n     * @param {String} action\n     * @returns {DOMString}\n     */\n    Modal.prototype.getActionSelector = function(action) {\n        return \"[data-action='\" + action + \"']\";\n    };\n\n    /**\n     * Set the flag to remove the modal from the DOM on close.\n     *\n     * @param {Boolean} remove\n     */\n    Modal.prototype.setRemoveOnClose = function(remove) {\n        this.removeOnClose = remove;\n    };\n\n    return Modal;\n});\n"],"file":"modal.min.js"}
\ No newline at end of file
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This file is part of Moodle - 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 * Contain the logic for modals.\n *\n * @module     core/modal\n * @class      modal\n * @package    core\n * @copyright  2016 Ryan Wyllie <ryan@moodle.com>\n * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later\n */\ndefine([\n    'jquery',\n    'core/templates',\n    'core/notification',\n    'core/key_codes',\n    'core/custom_interaction_events',\n    'core/modal_backdrop',\n    'core/event',\n    'core/modal_events',\n    'core/local/aria/focuslock',\n    'core/pending',\n    'core/aria',\n], function($, Templates, Notification, KeyCodes, CustomEvents, ModalBackdrop, Event, ModalEvents, FocusLock, Pending, Aria) {\n\n    var SELECTORS = {\n        CONTAINER: '[data-region=\"modal-container\"]',\n        MODAL: '[data-region=\"modal\"]',\n        HEADER: '[data-region=\"header\"]',\n        TITLE: '[data-region=\"title\"]',\n        BODY: '[data-region=\"body\"]',\n        FOOTER: '[data-region=\"footer\"]',\n        HIDE: '[data-action=\"hide\"]',\n        DIALOG: '[role=dialog]',\n        FORM: 'form',\n        MENU_BAR: '[role=menubar]',\n        HAS_Z_INDEX: '.moodle-has-zindex',\n        CAN_RECEIVE_FOCUS: 'input:not([type=\"hidden\"]), a[href], button, textarea, select, [tabindex]',\n    };\n\n    var TEMPLATES = {\n        LOADING: 'core/loading',\n        BACKDROP: 'core/modal_backdrop',\n    };\n\n    /**\n     * Module singleton for the backdrop to be reused by all Modal instances.\n     */\n    var backdropPromise;\n\n    /**\n     * A counter that gets incremented for each modal created. This can be\n     * used to generate unique values for the modals.\n     */\n    var modalCounter = 0;\n\n    /**\n     * Constructor for the Modal.\n     *\n     * @param {object} root The root jQuery element for the modal\n     */\n    var Modal = function(root) {\n        this.root = $(root);\n        this.modal = this.root.find(SELECTORS.MODAL);\n        this.header = this.modal.find(SELECTORS.HEADER);\n        this.headerPromise = $.Deferred();\n        this.title = this.header.find(SELECTORS.TITLE);\n        this.titlePromise = $.Deferred();\n        this.body = this.modal.find(SELECTORS.BODY);\n        this.bodyPromise = $.Deferred();\n        this.footer = this.modal.find(SELECTORS.FOOTER);\n        this.footerPromise = $.Deferred();\n        this.hiddenSiblings = [];\n        this.isAttached = false;\n        this.bodyJS = null;\n        this.footerJS = null;\n        this.modalCount = modalCounter++;\n\n        if (!this.root.is(SELECTORS.CONTAINER)) {\n            Notification.exception({message: 'Element is not a modal container'});\n        }\n\n        if (!this.modal.length) {\n            Notification.exception({message: 'Container does not contain a modal'});\n        }\n\n        if (!this.header.length) {\n            Notification.exception({message: 'Modal is missing a header region'});\n        }\n\n        if (!this.title.length) {\n            Notification.exception({message: 'Modal header is missing a title region'});\n        }\n\n        if (!this.body.length) {\n            Notification.exception({message: 'Modal is missing a body region'});\n        }\n\n        if (!this.footer.length) {\n            Notification.exception({message: 'Modal is missing a footer region'});\n        }\n\n        this.registerEventListeners();\n    };\n\n    /**\n     * Add the modal to the page, if it hasn't already been added. This includes running any\n     * javascript that has been cached until now.\n     *\n     * @method attachToDOM\n     */\n    Modal.prototype.attachToDOM = function() {\n        if (this.isAttached) {\n            return;\n        }\n\n        $('body').append(this.root);\n        FocusLock.trapFocus(this.root[0]);\n\n        // If we'd cached any JS then we can run it how that the modal is\n        // attached to the DOM.\n        if (this.bodyJS) {\n            Templates.runTemplateJS(this.bodyJS);\n            this.bodyJS = null;\n        }\n\n        if (this.footerJS) {\n            Templates.runTemplateJS(this.footerJS);\n            this.footerJS = null;\n        }\n\n        this.isAttached = true;\n    };\n\n    /**\n     * Count the number of other visible modals (not including this one).\n     *\n     * @method countOtherVisibleModals\n     * @return {int}\n     */\n    Modal.prototype.countOtherVisibleModals = function() {\n        var count = 0;\n        $('body').find(SELECTORS.CONTAINER).each(function(index, element) {\n            element = $(element);\n\n            // If we haven't found ourself and the element is visible.\n            if (!this.root.is(element) && element.hasClass('show')) {\n                count++;\n            }\n        }.bind(this));\n\n        return count;\n    };\n\n    /**\n     * Get the modal backdrop.\n     *\n     * @method getBackdrop\n     * @return {object} jQuery promise\n     */\n    Modal.prototype.getBackdrop = function() {\n        if (!backdropPromise) {\n            backdropPromise = Templates.render(TEMPLATES.BACKDROP, {})\n                .then(function(html) {\n                    var element = $(html);\n\n                    return new ModalBackdrop(element);\n                })\n                .fail(Notification.exception);\n        }\n\n        return backdropPromise;\n    };\n\n    /**\n     * Get the root element of this modal.\n     *\n     * @method getRoot\n     * @return {object} jQuery object\n     */\n    Modal.prototype.getRoot = function() {\n        return this.root;\n    };\n\n    /**\n     * Get the modal element of this modal.\n     *\n     * @method getModal\n     * @return {object} jQuery object\n     */\n    Modal.prototype.getModal = function() {\n        return this.modal;\n    };\n\n    /**\n     * Get the modal title element.\n     *\n     * @method getTitle\n     * @return {object} jQuery object\n     */\n    Modal.prototype.getTitle = function() {\n        return this.title;\n    };\n\n    /**\n     * Get the modal body element.\n     *\n     * @method getBody\n     * @return {object} jQuery object\n     */\n    Modal.prototype.getBody = function() {\n        return this.body;\n    };\n\n    /**\n     * Get the modal footer element.\n     *\n     * @method getFooter\n     * @return {object} jQuery object\n     */\n    Modal.prototype.getFooter = function() {\n        return this.footer;\n    };\n\n    /**\n     * Get a promise resolving to the title region.\n     *\n     * @method getTitlePromise\n     * @return {Promise}\n     */\n    Modal.prototype.getTitlePromise = function() {\n        return this.titlePromise;\n    };\n\n    /**\n     * Get a promise resolving to the body region.\n     *\n     * @method getBodyPromise\n     * @return {object} jQuery object\n     */\n    Modal.prototype.getBodyPromise = function() {\n        return this.bodyPromise;\n    };\n\n    /**\n     * Get a promise resolving to the footer region.\n     *\n     * @method getFooterPromise\n     * @return {object} jQuery object\n     */\n    Modal.prototype.getFooterPromise = function() {\n        return this.footerPromise;\n    };\n\n    /**\n     * Get the unique modal count.\n     *\n     * @method getModalCount\n     * @return {int}\n     */\n    Modal.prototype.getModalCount = function() {\n        return this.modalCount;\n    };\n\n    /**\n     * Set the modal title element.\n     *\n     * This method is overloaded to take either a string value for the title or a jQuery promise that is resolved with\n     * HTML most commonly from a Str.get_string call.\n     *\n     * @method setTitle\n     * @param {(string|object)} value The title string or jQuery promise which resolves to the title.\n     */\n    Modal.prototype.setTitle = function(value) {\n        var title = this.getTitle();\n        this.titlePromise = $.Deferred();\n\n        this.asyncSet(value, title.html.bind(title))\n        .then(function() {\n            this.titlePromise.resolve(title);\n        }.bind(this))\n        .catch(Notification.exception);\n    };\n\n    /**\n     * Set the modal body element.\n     *\n     * This method is overloaded to take either a string value for the body or a jQuery promise that is resolved with\n     * HTML and Javascript most commonly from a Templates.render call.\n     *\n     * @method setBody\n     * @param {(string|object)} value The body string or jQuery promise which resolves to the body.\n     */\n    Modal.prototype.setBody = function(value) {\n        this.bodyPromise = $.Deferred();\n\n        var body = this.getBody();\n\n        if (typeof value === 'string') {\n            // Just set the value if it's a string.\n            body.html(value);\n            Event.notifyFilterContentUpdated(body);\n            this.getRoot().trigger(ModalEvents.bodyRendered, this);\n            this.bodyPromise.resolve(body);\n        } else {\n            var jsPendingId = 'amd-modal-js-pending-id-' + this.getModalCount();\n            M.util.js_pending(jsPendingId);\n            // Otherwise we assume it's a promise to be resolved with\n            // html and javascript.\n            var contentPromise = null;\n            body.css('overflow', 'hidden');\n\n            // Ensure that the `value` is a jQuery Promise.\n            value = $.when(value);\n\n            if (value.state() == 'pending') {\n                // We're still waiting for the body promise to resolve so\n                // let's show a loading icon.\n                var height = body.innerHeight();\n                if (height < 100) {\n                    height = 100;\n                }\n\n                body.animate({height: height + 'px'}, 150);\n\n                body.html('');\n                contentPromise = Templates.render(TEMPLATES.LOADING, {})\n                    .then(function(html) {\n                        var loadingIcon = $(html).hide();\n                        body.html(loadingIcon);\n                        loadingIcon.fadeIn(150);\n\n                        // We only want the loading icon to fade out\n                        // when the content for the body has finished\n                        // loading.\n                        return $.when(loadingIcon.promise(), value);\n                    })\n                    .then(function(loadingIcon) {\n                        // Once the content has finished loading and\n                        // the loading icon has been shown then we can\n                        // fade the icon away to reveal the content.\n                        return loadingIcon.fadeOut(100).promise();\n                    })\n                    .then(function() {\n                        return value;\n                    });\n            } else {\n                // The content is already loaded so let's just display\n                // it to the user. No need for a loading icon.\n                contentPromise = value;\n            }\n\n            // Now we can actually display the content.\n            contentPromise.then(function(html, js) {\n                var result = null;\n\n                if (this.isVisible()) {\n                    // If the modal is visible then we should display\n                    // the content gracefully for the user.\n                    body.css('opacity', 0);\n                    var currentHeight = body.innerHeight();\n                    body.html(html);\n                    // We need to clear any height values we've set here\n                    // in order to measure the height of the content being\n                    // added. This then allows us to animate the height\n                    // transition.\n                    body.css('height', '');\n                    var newHeight = body.innerHeight();\n                    body.css('height', currentHeight + 'px');\n                    result = body.animate(\n                        {height: newHeight + 'px', opacity: 1},\n                        {duration: 150, queue: false}\n                    ).promise();\n                } else {\n                    // Since the modal isn't visible we can just immediately\n                    // set the content. No need to animate it.\n                    body.html(html);\n                }\n\n                if (js) {\n                    if (this.isAttached) {\n                        // If we're in the DOM then run the JS immediately.\n                        Templates.runTemplateJS(js);\n                    } else {\n                        // Otherwise cache it to be run when we're attached.\n                        this.bodyJS = js;\n                    }\n                }\n\n                return result;\n            }.bind(this))\n            .then(function(result) {\n                Event.notifyFilterContentUpdated(body);\n                this.getRoot().trigger(ModalEvents.bodyRendered, this);\n                return result;\n            }.bind(this))\n            .then(function() {\n                this.bodyPromise.resolve(body);\n                return;\n            }.bind(this))\n            .fail(Notification.exception)\n            .always(function() {\n                // When we're done displaying all of the content we need\n                // to clear the custom values we've set here.\n                body.css('height', '');\n                body.css('overflow', '');\n                body.css('opacity', '');\n                M.util.js_complete(jsPendingId);\n\n                return;\n            })\n            .fail(Notification.exception);\n        }\n    };\n\n    /**\n     * Set the modal footer element. The footer element is made visible, if it\n     * isn't already.\n     *\n     * This method is overloaded to take either a string\n     * value for the body or a jQuery promise that is resolved with HTML and Javascript\n     * most commonly from a Templates.render call.\n     *\n     * @method setFooter\n     * @param {(string|object)} value The footer string or jQuery promise\n     */\n    Modal.prototype.setFooter = function(value) {\n        // Make sure the footer is visible.\n        this.showFooter();\n        this.footerPromise = $.Deferred();\n\n        var footer = this.getFooter();\n\n        if (typeof value === 'string') {\n            // Just set the value if it's a string.\n            footer.html(value);\n            this.footerPromise.resolve(footer);\n        } else {\n            // Otherwise we assume it's a promise to be resolved with\n            // html and javascript.\n            Templates.render(TEMPLATES.LOADING, {})\n            .then(function(html) {\n                footer.html(html);\n\n                return value;\n            })\n            .then(function(html, js) {\n                footer.html(html);\n\n                if (js) {\n                    if (this.isAttached) {\n                        // If we're in the DOM then run the JS immediately.\n                        Templates.runTemplateJS(js);\n                    } else {\n                        // Otherwise cache it to be run when we're attached.\n                        this.footerJS = js;\n                    }\n                }\n\n                return footer;\n            }.bind(this))\n            .then(function(footer) {\n                this.footerPromise.resolve(footer);\n                return;\n            }.bind(this))\n            .catch(Notification.exception);\n        }\n    };\n\n    /**\n     * Check if the footer has any content in it.\n     *\n     * @method hasFooterContent\n     * @return {bool}\n     */\n    Modal.prototype.hasFooterContent = function() {\n        return this.getFooter().children().length ? true : false;\n    };\n\n    /**\n     * Hide the footer element.\n     *\n     * @method hideFooter\n     */\n    Modal.prototype.hideFooter = function() {\n        this.getFooter().addClass('hidden');\n    };\n\n    /**\n     * Show the footer element.\n     *\n     * @method showFooter\n     */\n    Modal.prototype.showFooter = function() {\n        this.getFooter().removeClass('hidden');\n    };\n\n    /**\n     * Mark the modal as a large modal.\n     *\n     * @method setLarge\n     */\n    Modal.prototype.setLarge = function() {\n        if (this.isLarge()) {\n            return;\n        }\n\n        this.getModal().addClass('modal-lg');\n    };\n\n    /**\n     * Check if the modal is a large modal.\n     *\n     * @method isLarge\n     * @return {bool}\n     */\n    Modal.prototype.isLarge = function() {\n        return this.getModal().hasClass('modal-lg');\n    };\n\n    /**\n     * Mark the modal as a small modal.\n     *\n     * @method setSmall\n     */\n    Modal.prototype.setSmall = function() {\n        if (this.isSmall()) {\n            return;\n        }\n\n        this.getModal().removeClass('modal-lg');\n    };\n\n    /**\n     * Check if the modal is a small modal.\n     *\n     * @method isSmall\n     * @return {bool}\n     */\n    Modal.prototype.isSmall = function() {\n        return !this.getModal().hasClass('modal-lg');\n    };\n\n    /**\n     * Set this modal to be scrollable or not.\n     *\n     * @method setScrollable\n     * @param {bool} value Whether the modal is scrollable or not\n     */\n    Modal.prototype.setScrollable = function(value) {\n        if (!value) {\n            this.getModal()[0].classList.remove('modal-dialog-scrollable');\n            return;\n        }\n\n        this.getModal()[0].classList.add('modal-dialog-scrollable');\n    };\n\n\n    /**\n     * Determine the highest z-index value currently on the page.\n     *\n     * @method calculateZIndex\n     * @return {int}\n     */\n    Modal.prototype.calculateZIndex = function() {\n        var items = $(SELECTORS.DIALOG + ', ' + SELECTORS.MENU_BAR + ', ' + SELECTORS.HAS_Z_INDEX);\n        var zIndex = parseInt(this.root.css('z-index'));\n\n        items.each(function(index, item) {\n            item = $(item);\n            // Note that webkit browsers won't return the z-index value from the CSS stylesheet\n            // if the element doesn't have a position specified. Instead it'll return \"auto\".\n            var itemZIndex = item.css('z-index') ? parseInt(item.css('z-index')) : 0;\n\n            if (itemZIndex > zIndex) {\n                zIndex = itemZIndex;\n            }\n        });\n\n        return zIndex;\n    };\n\n    /**\n     * Check if this modal is visible.\n     *\n     * @method isVisible\n     * @return {bool}\n     */\n    Modal.prototype.isVisible = function() {\n        return this.root.hasClass('show');\n    };\n\n    /**\n     * Check if this modal has focus.\n     *\n     * @method hasFocus\n     * @return {bool}\n     */\n    Modal.prototype.hasFocus = function() {\n        var target = $(document.activeElement);\n        return this.root.is(target) || this.root.has(target).length;\n    };\n\n    /**\n     * Check if this modal has CSS transitions applied.\n     *\n     * @method hasTransitions\n     * @return {bool}\n     */\n    Modal.prototype.hasTransitions = function() {\n        return this.getRoot().hasClass('fade');\n    };\n\n    /**\n     * Display this modal. The modal will be attached to the DOM if it hasn't\n     * already been.\n     *\n     * @method show\n     * @returns {Promise}\n     */\n    Modal.prototype.show = function() {\n        if (this.isVisible()) {\n            return $.Deferred().resolve();\n        }\n\n        var pendingPromise = new Pending('core/modal:show');\n\n        if (this.hasFooterContent()) {\n            this.showFooter();\n        } else {\n            this.hideFooter();\n        }\n\n        if (!this.isAttached) {\n            this.attachToDOM();\n        }\n\n        return this.getBackdrop()\n        .then(function(backdrop) {\n            var currentIndex = this.calculateZIndex();\n            var newIndex = currentIndex + 2;\n            var newBackdropIndex = newIndex - 1;\n            this.root.css('z-index', newIndex);\n            backdrop.setZIndex(newBackdropIndex);\n            backdrop.show();\n\n            this.root.removeClass('hide').addClass('show');\n            this.accessibilityShow();\n            this.getModal().focus();\n            $('body').addClass('modal-open');\n            this.root.trigger(ModalEvents.shown, this);\n\n            return;\n        }.bind(this))\n        .then(pendingPromise.resolve);\n    };\n\n    /**\n     * Hide this modal if it does not contain a form.\n     *\n     * @method hideIfNotForm\n     */\n    Modal.prototype.hideIfNotForm = function() {\n        var formElement = this.modal.find(SELECTORS.FORM);\n        if (formElement.length == 0) {\n            this.hide();\n        }\n    };\n\n    /**\n     * Hide this modal.\n     *\n     * @method hide\n     */\n    Modal.prototype.hide = function() {\n        this.getBackdrop().done(function(backdrop) {\n            FocusLock.untrapFocus();\n            if (!this.countOtherVisibleModals()) {\n                // Hide the backdrop if we're the last open modal.\n                backdrop.hide();\n                $('body').removeClass('modal-open');\n            }\n\n            var currentIndex = parseInt(this.root.css('z-index'));\n            this.root.css('z-index', '');\n            backdrop.setZIndex(currentIndex - 3);\n\n            this.accessibilityHide();\n\n            if (this.hasTransitions()) {\n                // Wait for CSS transitions to complete before hiding the element.\n                this.getRoot().one('transitionend webkitTransitionEnd oTransitionEnd', function() {\n                    this.getRoot().removeClass('show').addClass('hide');\n                }.bind(this));\n            } else {\n                this.getRoot().removeClass('show').addClass('hide');\n            }\n\n            this.root.trigger(ModalEvents.hidden, this);\n        }.bind(this));\n    };\n\n    /**\n     * Remove this modal from the DOM.\n     *\n     * @method destroy\n     */\n    Modal.prototype.destroy = function() {\n        this.hide();\n        this.root.remove();\n        this.root.trigger(ModalEvents.destroyed, this);\n    };\n\n    /**\n     * Sets the appropriate aria attributes on this dialogue and the other\n     * elements in the DOM to ensure that screen readers are able to navigate\n     * the dialogue popup correctly.\n     *\n     * @method accessibilityShow\n     */\n    Modal.prototype.accessibilityShow = function() {\n        Aria.hideSiblings(this.root.get()[0]);\n\n        // Make us visible to screen readers.\n        this.root.removeAttr('aria-hidden');\n    };\n\n    /**\n     * Restores the aria visibility on the DOM elements changed when displaying\n     * the dialogue popup and makes the dialogue aria hidden to allow screen\n     * readers to navigate the main page correctly when the dialogue is closed.\n     *\n     * @method accessibilityHide\n     */\n    Modal.prototype.accessibilityHide = function() {\n        this.root.attr('aria-hidden', 'true');\n\n        Aria.unhideSiblings(this.root.get()[0]);\n    };\n\n    /**\n     * Set up all of the event handling for the modal.\n     *\n     * @method registerEventListeners\n     */\n    Modal.prototype.registerEventListeners = function() {\n        this.getRoot().on('keydown', function(e) {\n            if (!this.isVisible()) {\n                return;\n            }\n\n            if (e.keyCode == KeyCodes.escape) {\n                this.hide();\n            }\n        }.bind(this));\n\n        // Listen for clicks on the modal container.\n        this.getRoot().click(function(e) {\n            // If the click wasn't inside the modal element then we should\n            // hide the modal.\n            if (!$(e.target).closest(SELECTORS.MODAL).length) {\n                // The check above fails to detect the click was inside the modal when the DOM tree is already changed.\n                // So, we check if we can still find the container element or not. If not, then the DOM tree is changed.\n                // It's best not to hide the modal in that case.\n                if ($(e.target).closest(SELECTORS.CONTAINER).length) {\n                    this.hideIfNotForm();\n                }\n            }\n        }.bind(this));\n\n        CustomEvents.define(this.getModal(), [CustomEvents.events.activate]);\n        this.getModal().on(CustomEvents.events.activate, SELECTORS.HIDE, function(e, data) {\n            this.hide();\n            data.originalEvent.preventDefault();\n        }.bind(this));\n    };\n\n    /**\n     * Register a listener to close the dialogue when the cancel button is pressed.\n     *\n     * @method registerCloseOnCancel\n     */\n    Modal.prototype.registerCloseOnCancel = function() {\n        // Handle the clicking of the Cancel button.\n        this.getModal().on(CustomEvents.events.activate, this.getActionSelector('cancel'), function(e, data) {\n            var cancelEvent = $.Event(ModalEvents.cancel);\n            this.getRoot().trigger(cancelEvent, this);\n\n            if (!cancelEvent.isDefaultPrevented()) {\n                data.originalEvent.preventDefault();\n\n                if (this.removeOnClose) {\n                    this.destroy();\n                } else {\n                    this.hide();\n                }\n            }\n        }.bind(this));\n    };\n\n    /**\n     * Register a listener to close the dialogue when the save button is pressed.\n     *\n     * @method registerCloseOnSave\n     */\n    Modal.prototype.registerCloseOnSave = function() {\n        // Handle the clicking of the Cancel button.\n        this.getModal().on(CustomEvents.events.activate, this.getActionSelector('save'), function(e, data) {\n            var saveEvent = $.Event(ModalEvents.save);\n            this.getRoot().trigger(saveEvent, this);\n\n            if (!saveEvent.isDefaultPrevented()) {\n                data.originalEvent.preventDefault();\n\n                if (this.removeOnClose) {\n                    this.destroy();\n                } else {\n                    this.hide();\n                }\n            }\n        }.bind(this));\n    };\n\n    /**\n     * Set or resolve and set the value using the function.\n     *\n     * @method asyncSet\n     * @param {(string|object)} value The string or jQuery promise.\n     * @param {function} setFunction The setter\n     * @return {Promise}\n     */\n    Modal.prototype.asyncSet = function(value, setFunction) {\n        var p = value;\n        if (typeof value !== 'object' || !value.hasOwnProperty('then')) {\n            p = $.Deferred();\n            p.resolve(value);\n        }\n\n        p.then(function(content) {\n            setFunction(content);\n\n            return;\n        })\n        .fail(Notification.exception);\n\n        return p;\n    };\n\n    /**\n     * Set the title text of a button.\n     *\n     * This method is overloaded to take either a string value for the button title or a jQuery promise that is resolved with\n     * text most commonly from a Str.get_string call.\n     *\n     * @param {DOMString} action The action of the button\n     * @param {(String|object)} value The button text, or a promise which will resolve to it\n     * @returns {Promise}\n     */\n    Modal.prototype.setButtonText = function(action, value) {\n        const button = this.getFooter().find(this.getActionSelector(action));\n\n        if (!button) {\n            throw new Error(\"Unable to find the '\" + action + \"' button\");\n        }\n\n        return this.asyncSet(value, button.text.bind(button));\n    };\n\n    /**\n     * Get the Selector for an action.\n     *\n     * @param {String} action\n     * @returns {DOMString}\n     */\n    Modal.prototype.getActionSelector = function(action) {\n        return \"[data-action='\" + action + \"']\";\n    };\n\n    /**\n     * Set the flag to remove the modal from the DOM on close.\n     *\n     * @param {Boolean} remove\n     */\n    Modal.prototype.setRemoveOnClose = function(remove) {\n        this.removeOnClose = remove;\n    };\n\n    return Modal;\n});\n"],"file":"modal.min.js"}
\ No newline at end of file
diff --git a/lib/amd/build/normalise.min.js b/lib/amd/build/normalise.min.js
new file mode 100644
index 00000000000..b31b2d0a77f
--- /dev/null
+++ b/lib/amd/build/normalise.min.js
@@ -0,0 +1,2 @@
+define ("core/normalise",["exports","jquery"],function(a,b){"use strict";Object.defineProperty(a,"__esModule",{value:!0});a.getList=void 0;b=function(a){return a&&a.__esModule?a:{default:a}}(b);var c=function(a){if(a instanceof HTMLElement){return[a]}if(a instanceof Array){return a}if(a instanceof NodeList){return Array.from(a)}if(a instanceof b.default){return a.get()}return Array.from(a)};a.getList=c});
+//# sourceMappingURL=normalise.min.js.map
diff --git a/lib/amd/build/normalise.min.js.map b/lib/amd/build/normalise.min.js.map
new file mode 100644
index 00000000000..c9598b2d1aa
--- /dev/null
+++ b/lib/amd/build/normalise.min.js.map
@@ -0,0 +1 @@
+{"version":3,"sources":["../src/normalise.js"],"names":["getList","nodes","HTMLElement","Array","NodeList","from","jQuery","get"],"mappings":"2IAyBA,uDAEO,GAAMA,CAAAA,CAAO,CAAG,SAAAC,CAAK,CAAI,CAC5B,GAAIA,CAAK,WAAYC,CAAAA,WAArB,CAAkC,CAE9B,MAAO,CAACD,CAAD,CACV,CAED,GAAIA,CAAK,WAAYE,CAAAA,KAArB,CAA4B,CAExB,MAAOF,CAAAA,CACV,CAED,GAAIA,CAAK,WAAYG,CAAAA,QAArB,CAA+B,CAE3B,MAAOD,CAAAA,KAAK,CAACE,IAAN,CAAWJ,CAAX,CACV,CAED,GAAIA,CAAK,WAAYK,UAArB,CAA6B,CAEzB,MAAOL,CAAAA,CAAK,CAACM,GAAN,EACV,CAGD,MAAOJ,CAAAA,KAAK,CAACE,IAAN,CAAWJ,CAAX,CACV,CAvBM,C","sourcesContent":["// This file is part of Moodle - 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 * Normalisation helpers.\n *\n * @module     core/normalise\n * @class      normalise\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 */\n\nimport jQuery from 'jquery';\n\nexport const getList = nodes => {\n    if (nodes instanceof HTMLElement) {\n        // A single record to conver to a NodeList.\n        return [nodes];\n    }\n\n    if (nodes instanceof Array) {\n        // A single record to conver to a NodeList.\n        return nodes;\n    }\n\n    if (nodes instanceof NodeList) {\n        // Already a NodeList.\n        return Array.from(nodes);\n    }\n\n    if (nodes instanceof jQuery) {\n        // A jQuery object to a NodeList.\n        return nodes.get();\n    }\n\n    // Fallback to just having a go.\n    return Array.from(nodes);\n};\n"],"file":"normalise.min.js"}
\ No newline at end of file
diff --git a/lib/amd/src/aria.js b/lib/amd/src/aria.js
new file mode 100644
index 00000000000..394effea47b
--- /dev/null
+++ b/lib/amd/src/aria.js
@@ -0,0 +1,31 @@
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * Helpers to perform ARIA compliance changes to the DOM.
+ *
+ * @module     core/aria
+ * @class      aria
+ * @package    core
+ * @copyright  2020 Andrew Nicols <andrew@nicols.co.uk>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+export {
+    hide,
+    unhide,
+    hideSiblings,
+    unhideSiblings,
+} from './local/aria/aria-hidden';
diff --git a/lib/amd/src/local/aria/aria-hidden.js b/lib/amd/src/local/aria/aria-hidden.js
new file mode 100644
index 00000000000..a5989a02a80
--- /dev/null
+++ b/lib/amd/src/local/aria/aria-hidden.js
@@ -0,0 +1,267 @@
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * ARIA helpers related to the aria-hidden attribute.
+ *
+ * @module     core/local/aria/aria-hidden.
+ * @class      aria
+ * @package    core
+ * @copyright  2020 Andrew Nicols <andrew@nicols.co.uk>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+import {getList} from 'core/normalise';
+import Selectors from './selectors';
+
+// The map of MutationObserver objects for an object.
+const childObserverMap = new Map();
+const siblingObserverMap = new Map();
+
+/**
+ * Determine whether the browser supports the MutationObserver system.
+ *
+ * @returns {Bool}
+ */
+const supportsMutationObservers = () => (MutationObserver && typeof MutationObserver === 'function');
+
+/**
+ * Disable element focusability, disabling the tabindex for child elements which are normally focusable.
+ *
+ * @param {HTMLElement} target
+ */
+const disableElementFocusability = target => {
+    if (!(target instanceof HTMLElement)) {
+        // This element is not an HTMLElement.
+        // This can happen for Text Nodes.
+        return;
+    }
+
+    if (target.matches(Selectors.elements.focusable)) {
+        disableAndStoreTabIndex(target);
+    }
+
+    target.querySelectorAll(Selectors.elements.focusable).forEach(disableAndStoreTabIndex);
+};
+
+/**
+ * Remove the current tab-index and store it for later restoration.
+ *
+ * @param {HTMLElement} element
+ */
+const disableAndStoreTabIndex = element => {
+    if (typeof element.dataset.ariaHiddenTabIndex !== 'undefined') {
+        // This child already has a hidden attribute.
+        // Do not modify it as the original value will be lost.
+        return;
+    }
+
+    // Store the old tabindex in a data attribute.
+    if (element.getAttribute('tabindex')) {
+        element.dataset.ariaHiddenTabIndex = element.getAttribute('tabindex');
+    } else {
+        element.dataset.ariaHiddenTabIndex = '';
+    }
+    element.setAttribute('tabindex', -1);
+};
+
+/**
+ * Re-enable element focusability, restoring any tabindex.
+ *
+ * @param {HTMLElement} target
+ */
+const enableElementFocusability = target => {
+    if (!(target instanceof HTMLElement)) {
+        // This element is not an HTMLElement.
+        // This can happen for Text Nodes.
+        return;
+    }
+
+    if (target.matches(Selectors.elements.focusableToUnhide)) {
+        restoreTabIndex(target);
+    }
+
+    target.querySelectorAll(Selectors.elements.focusableToUnhide).forEach(restoreTabIndex);
+};
+
+/**
+ * Restore the tab-index of the supplied element.
+ *
+ * When disabling focusability the current tab-index is stored in the ariaHiddenTabIndex data attribute.
+ * This is used to restore the tab-index, but only whilst the parent nodes remain unhidden.
+ *
+ * @param {HTMLElement} element
+ */
+const restoreTabIndex = element => {
+    if (element.closest(Selectors.aria.hidden)) {
+        // This item still has a hidden parent, or is hidden itself. Do not unhide it.
+        return;
+    }
+
+    const oldTabIndex = element.dataset.ariaHiddenTabIndex;
+    if (oldTabIndex === '') {
+        element.removeAttribute('tabindex');
+    } else {
+        element.setAttribute('tabindex', oldTabIndex);
+    }
+
+    delete element.dataset.ariaHiddenTabIndex;
+};
+
+/**
+ * Update the supplied DOM Module to be hidden.
+ *
+ * @param {HTMLElement} target
+ * @returns {Array}
+ */
+export const hide = target => getList(target).forEach(_hide);
+
+const _hide = target => {
+    if (!(target instanceof HTMLElement)) {
+        // This element is not an HTMLElement.
+        // This can happen for Text Nodes.
+        return;
+    }
+
+    if (target.closest(Selectors.aria.hidden)) {
+        // This Element, or a parent Element, is already hidden.
+        // Stop processing.
+        return;
+    }
+
+    // Set the aria-hidden attribute to true.
+    target.setAttribute('aria-hidden', true);
+
+    // Based on advice from https://dequeuniversity.com/rules/axe/3.3/aria-hidden-focus, upon setting the aria-hidden
+    // attribute, all focusable elements underneath that element should be modified such that they are not focusable.
+    disableElementFocusability(target);
+
+    if (supportsMutationObservers()) {
+        // Add a MutationObserver to check for new children to the tree.
+        const newNodeObserver = new MutationObserver(mutationList => {
+            mutationList.forEach(mutation => {
+                mutation.addedNodes.forEach(disableElementFocusability);
+            });
+        });
+
+        newNodeObserver.observe(target, {childList: true, subtree: true});
+        childObserverMap.set(target, newNodeObserver);
+    }
+};
+
+/**
+ * Reverse the effect of the hide action.
+ *
+ * @param {HTMLElement} target
+ * @returns {Array}
+ */
+export const unhide = target => getList(target).forEach(_unhide);
+
+const _unhide = target => {
+    if (!(target instanceof HTMLElement)) {
+        return;
+    }
+
+    // Note: The aria-hidden attribute should be removed, and not set to false.
+    // The presence of the attribute is sufficient for some browsers to treat it as being true, regardless of its value.
+    target.removeAttribute('aria-hidden');
+
+    // Restore the tabindex across all child nodes of the target.
+    enableElementFocusability(target);
+
+    // Remove the focusability MutationObserver watching this tree.
+    if (childObserverMap.has(target)) {
+        childObserverMap.get(target).disconnect();
+        childObserverMap.delete(target);
+    }
+};
+
+/**
+ * Correctly mark all siblings of the supplied target Element as hidden.
+ *
+ * @param {HTMLElement} target
+ * @returns {Array}
+ */
+export const hideSiblings = target => getList(target).forEach(_hideSiblings);
+
+const _hideSiblings = target => {
+    if (!(target instanceof HTMLElement)) {
+        return;
+    }
+
+    if (!target.parentElement) {
+        return;
+    }
+
+    target.parentElement.childNodes.forEach(node => {
+        if (node === target) {
+            // Skip self;
+            return;
+        }
+
+        hide(node);
+    });
+
+    if (supportsMutationObservers()) {
+        // Add a MutationObserver to check for new children to the tree.
+        const newNodeObserver = new MutationObserver(mutationList => {
+            mutationList.forEach(mutation => {
+                mutation.addedNodes.forEach(node => {
+                    if (target.contains(node)) {
+                        // Skip self, and children of self.
+                        return;
+                    }
+
+                    hide(node);
+                });
+            });
+        });
+
+        newNodeObserver.observe(target.parentElement, {childList: true, subtree: true});
+        siblingObserverMap.set(target.parentElement, newNodeObserver);
+    }
+};
+
+/**
+ * Correctly reverse the hide action of all children of the supplied target Element.
+ *
+ * @param {HTMLElement} target
+ * @returns {Array}
+ */
+export const unhideSiblings = target => getList(target).forEach(_unhideSiblings);
+
+const _unhideSiblings = target => {
+    if (!(target instanceof HTMLElement)) {
+        return;
+    }
+
+    if (!target.parentElement) {
+        return;
+    }
+
+    target.parentElement.childNodes.forEach(node => {
+        if (node === target) {
+            // Skip self;
+            return;
+        }
+
+        unhide(node);
+    });
+
+    // Remove the sibling MutationObserver watching this tree.
+    if (siblingObserverMap.has(target.parentElement)) {
+        siblingObserverMap.get(target.parentElement).disconnect();
+        siblingObserverMap.delete(target.parentElement);
+    }
+};
diff --git a/lib/amd/src/local/aria/selectors.js b/lib/amd/src/local/aria/selectors.js
new file mode 100644
index 00000000000..c7a45efdcf2
--- /dev/null
+++ b/lib/amd/src/local/aria/selectors.js
@@ -0,0 +1,33 @@
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * Selectors used for ARIA.
+ *
+ * @module     core/local/aria/selectors
+ * @class      selectors
+ * @package    core
+ * @copyright  2020 Andrew Nicols <andrew@nicols.co.uk>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+export default {
+    aria: {
+        hidden: '[aria-hidden]',
+    },
+    elements: {
+        focusable: 'input:not([type="hidden"]), a[href], button, textarea, select, [tabindex]',
+        focusableToUnhide: '[data-aria-hidden-tab-index]',
+    },
+};
diff --git a/lib/amd/src/modal.js b/lib/amd/src/modal.js
index 442c5b0f052..184c8d6e5de 100644
--- a/lib/amd/src/modal.js
+++ b/lib/amd/src/modal.js
@@ -33,7 +33,8 @@ define([
     'core/modal_events',
     'core/local/aria/focuslock',
     'core/pending',
-], function($, Templates, Notification, KeyCodes, CustomEvents, ModalBackdrop, Event, ModalEvents, FocusLock, Pending) {
+    'core/aria',
+], function($, Templates, Notification, KeyCodes, CustomEvents, ModalBackdrop, Event, ModalEvents, FocusLock, Pending, Aria) {
 
     var SELECTORS = {
         CONTAINER: '[data-region="modal-container"]',
@@ -732,30 +733,10 @@ define([
      * @method accessibilityShow
      */
     Modal.prototype.accessibilityShow = function() {
-        // We need to get a list containing each sibling element and the shallowest
-        // non-ancestral nodes in the DOM. We can shortcut this a little by leveraging
-        // the fact that this dialogue is always appended to the document body therefore
-        // it's siblings are the shallowest non-ancestral nodes. If that changes then
-        // this code should also be updated.
-        $('body').children().each(function(index, child) {
-            // Skip the current modal.
-            if (!this.root.is(child)) {
-                child = $(child);
-                var hidden = child.attr('aria-hidden');
-                // If they are already hidden we can ignore them.
-                if (hidden !== 'true') {
-                    // Save their current state.
-                    child.data('previous-aria-hidden', hidden);
-                    this.hiddenSiblings.push(child);
-
-                    // Hide this node from screen readers.
-                    child.attr('aria-hidden', 'true');
-                }
-            }
-        }.bind(this));
+        Aria.hideSiblings(this.root.get()[0]);
 
         // Make us visible to screen readers.
-        this.root.attr('aria-hidden', 'false');
+        this.root.removeAttr('aria-hidden');
     };
 
     /**
@@ -768,22 +749,7 @@ define([
     Modal.prototype.accessibilityHide = function() {
         this.root.attr('aria-hidden', 'true');
 
-        // Restore the sibling nodes back to their original values.
-        $.each(this.hiddenSiblings, function(index, sibling) {
-            sibling = $(sibling);
-            var previousValue = sibling.data('previous-aria-hidden');
-            // If the element didn't previously have an aria-hidden attribute
-            // then we can just remove the one we set.
-            if (typeof previousValue == 'undefined') {
-                sibling.removeAttr('aria-hidden');
-            } else {
-                // Otherwise set it back to the old value (which will be false).
-                sibling.attr('aria-hidden', previousValue);
-            }
-        });
-
-        // Clear the cache. No longer need to store these.
-        this.hiddenSiblings = [];
+        Aria.unhideSiblings(this.root.get()[0]);
     };
 
     /**
diff --git a/lib/amd/src/normalise.js b/lib/amd/src/normalise.js
new file mode 100644
index 00000000000..e5afcafb190
--- /dev/null
+++ b/lib/amd/src/normalise.js
@@ -0,0 +1,51 @@
+// This file is part of Moodle - http://moodle.org/
+//
+// Moodle is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Moodle is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
+
+/**
+ * Normalisation helpers.
+ *
+ * @module     core/normalise
+ * @class      normalise
+ * @package    core
+ * @copyright  2020 Andrew Nicols <andrew@nicols.co.uk>
+ * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
+ */
+
+import jQuery from 'jquery';
+
+export const getList = nodes => {
+    if (nodes instanceof HTMLElement) {
+        // A single record to conver to a NodeList.
+        return [nodes];
+    }
+
+    if (nodes instanceof Array) {
+        // A single record to conver to a NodeList.
+        return nodes;
+    }
+
+    if (nodes instanceof NodeList) {
+        // Already a NodeList.
+        return Array.from(nodes);
+    }
+
+    if (nodes instanceof jQuery) {
+        // A jQuery object to a NodeList.
+        return nodes.get();
+    }
+
+    // Fallback to just having a go.
+    return Array.from(nodes);
+};