diff --git a/lib/amd/build/popper.min.js b/lib/amd/build/popper.min.js
index 94e963eed74..780ebf570c0 100644
--- a/lib/amd/build/popper.min.js
+++ b/lib/amd/build/popper.min.js
@@ -1 +1 @@
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a.reduce(function(a,b){return""===a[a.length-1]&&["+","-"].indexOf(b)!==-1?(a[a.length-1]=b,g=!0,a):g?(a[a.length-1]+=b,g=!1,a):a.concat(b)},[]).map(function(a){return $(a,e,b,c)})}),j.forEach(function(a,b){a.forEach(function(c,d){O(c)&&(e[b]+=c*("-"===a[d-1]?-1:1))})}),e}function aa(a,b){var c=b.offset,d=a.placement,e=a.offsets,f=e.popper,g=e.reference,h=d.split("-")[0],i=void 0;return i=O(+c)?[+c,0]:_(c,f,g,h),"left"===h?(f.top+=i[0],f.left-=i[1]):"right"===h?(f.top+=i[0],f.left+=i[1]):"top"===h?(f.left+=i[0],f.top-=i[1]):"bottom"===h&&(f.left+=i[0],f.top+=i[1]),a.popper=f,a}function ba(a,b){var c=b.boundariesElement||g(a.instance.popper);a.instance.reference===c&&(c=g(c));var d=u(a.instance.popper,a.instance.reference,b.padding,c);b.boundaries=d;var e=b.priority,f=a.offsets.popper,h={primary:function(a){var c=f[a];return f[a]<d[a]&&!b.escapeWithReference&&(c=Math.max(f[a],d[a])),pa({},a,c)},secondary:function(a){var c="right"===a?"left":"top",e=f[c];return f[a]>d[a]&&!b.escapeWithReference&&(e=Math.min(f[c],d[a]-("right"===a?f.width:f.height))),pa({},c,e)}};return e.forEach(function(a){var b=["left","top"].indexOf(a)!==-1?"primary":"secondary";f=qa({},f,h[b](a))}),a.offsets.popper=f,a}function ca(a){var b=a.placement,c=b.split("-")[0],d=b.split("-")[1];if(d){var e=a.offsets,f=e.reference,g=e.popper,h=["bottom","top"].indexOf(c)!==-1,i=h?"left":"top",j=h?"width":"height",k={start:pa({},i,f[i]),end:pa({},i,f[i]+f[j]-g[j])};a.offsets.popper=qa({},g,k[d])}return a}function da(a){if(!U(a.instance.modifiers,"hide","preventOverflow"))return a;var b=a.offsets.reference,c=B(a.instance.modifiers,function(a){return"preventOverflow"===a.name}).boundaries;if(b.bottom<c.top||b.left>c.right||b.top>c.bottom||b.right<c.left){if(a.hide===!0)return a;a.hide=!0,a.attributes["x-out-of-boundaries"]=""}else{if(a.hide===!1)return a;a.hide=!1,a.attributes["x-out-of-boundaries"]=!1}return a}function ea(a){var b=a.placement,c=b.split("-")[0],d=a.offsets,e=d.popper,f=d.reference,g=["left","right"].indexOf(c)!==-1,h=["top","left"].indexOf(c)===-1;return e[g?"left":"top"]=f[c]-(h?e[g?"width":"height"]:0),a.placement=z(b),a.offsets.popper=p(e),a}for(var fa="undefined"!=typeof window&&"undefined"!=typeof window.document,ga=["Edge","Trident","Firefox"],ha=0,ia=0;ia<ga.length;ia+=1)if(fa&&navigator.userAgent.indexOf(ga[ia])>=0){ha=1;break}var ja=fa&&window.Promise,ka=ja?a:b,la=void 0,ma=function(){return void 0===la&&(la=navigator.appVersion.indexOf("MSIE 10")!==-1),la},na=function(a,b){if(!(a instanceof b))throw new TypeError("Cannot call a class as a function")},oa=function(){function a(a,b){for(var c=0;c<b.length;c++){var d=b[c];d.enumerable=d.enumerable||!1,d.configurable=!0,"value"in d&&(d.writable=!0),Object.defineProperty(a,d.key,d)}}return function(b,c,d){return c&&a(b.prototype,c),d&&a(b,d),b}}(),pa=function(a,b,c){return b in a?Object.defineProperty(a,b,{value:c,enumerable:!0,configurable:!0,writable:!0}):a[b]=c,a},qa=Object.assign||function(a){for(var b=1;b<arguments.length;b++){var c=arguments[b];for(var d in c)Object.prototype.hasOwnProperty.call(c,d)&&(a[d]=c[d])}return a},ra=["auto-start","auto","auto-end","top-start","top","top-end","right-start","right","right-end","bottom-end","bottom","bottom-start","left-end","left","left-start"],sa=ra.slice(3),ta={FLIP:"flip",CLOCKWISE:"clockwise",COUNTERCLOCKWISE:"counterclockwise"},ua={shift:{order:100,enabled:!0,fn:ca},offset:{order:200,enabled:!0,fn:aa,offset:0},preventOverflow:{order:300,enabled:!0,fn:ba,priority:["left","right","top","bottom"],padding:5,boundariesElement:"scrollParent"},keepTogether:{order:400,enabled:!0,fn:Z},arrow:{order:500,enabled:!0,fn:V,element:"[x-arrow]"},flip:{order:600,enabled:!0,fn:Y,behavior:"flip",padding:5,boundariesElement:"viewport"},inner:{order:700,enabled:!1,fn:ea},hide:{order:800,enabled:!0,fn:da},computeStyle:{order:850,enabled:!0,fn:T,gpuAcceleration:!0,x:"bottom",y:"right"},applyStyle:{order:900,enabled:!0,fn:R,onLoad:S,gpuAcceleration:void 0}},va={placement:"bottom",eventsEnabled:!0,removeOnDestroy:!1,onCreate:function(){},onUpdate:function(){},modifiers:ua},wa=function(){function a(b,d){var e=this,f=arguments.length>2&&void 0!==arguments[2]?arguments[2]:{};na(this,a),this.scheduleUpdate=function(){return requestAnimationFrame(e.update)},this.update=ka(this.update.bind(this)),this.options=qa({},a.Defaults,f),this.state={isDestroyed:!1,isCreated:!1,scrollParents:[]},this.reference=b&&b.jquery?b[0]:b,this.popper=d&&d.jquery?d[0]:d,this.options.modifiers={},Object.keys(qa({},a.Defaults.modifiers,f.modifiers)).forEach(function(b){e.options.modifiers[b]=qa({},a.Defaults.modifiers[b]||{},f.modifiers?f.modifiers[b]:{})}),this.modifiers=Object.keys(this.options.modifiers).map(function(a){return qa({name:a},e.options.modifiers[a])}).sort(function(a,b){return a.order-b.order}),this.modifiers.forEach(function(a){a.enabled&&c(a.onLoad)&&a.onLoad(e.reference,e.popper,e.options,a,e.state)}),this.update();var g=this.options.eventsEnabled;g&&this.enableEventListeners(),this.state.eventsEnabled=g}return oa(a,[{key:"update",value:function(){return E.call(this)}},{key:"destroy",value:function(){return H.call(this)}},{key:"enableEventListeners",value:function(){return L.call(this)}},{key:"disableEventListeners",value:function(){return N.call(this)}}]),a}();return wa.Utils=("undefined"!=typeof window?window:global).PopperUtils,wa.placements=ra,wa.Defaults=va,wa});
\ No newline at end of file
diff --git a/lib/amd/src/popper.js b/lib/amd/src/popper.js
index b46731f42a2..ecefee60c14 100644
--- a/lib/amd/src/popper.js
+++ b/lib/amd/src/popper.js
@@ -1,6 +1,6 @@
 /**!
  * @fileOverview Kickass library to create and place poppers near their reference elements.
- * @version 1.12.9
+ * @version 1.12.6
  * @license
  * Copyright (c) 2016 Federico Zivolo and contributors
  *
@@ -22,21 +22,13 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  * SOFTWARE.
  */
-
-/**
- * Description of import/upgrade into Moodle:
- * 1. Clone https://github.com/FezVrasta/popper.js into an unrelated directory
- * 2. Copy /build/popper.js to lib/amd/src/
- * 3. Add back these instructions
- */
-
 (function (global, factory) {
-	typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
-	typeof define === 'function' && define.amd ? define(factory) :
-	(global.Popper = factory());
+  typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
+  typeof define === 'function' && define.amd ? define(factory) :
+  (global.Popper = factory());
 }(this, (function () { 'use strict';
 
-var isBrowser = typeof window !== 'undefined' && typeof document !== 'undefined';
+var isBrowser = typeof window !== 'undefined' && typeof window.document !== 'undefined';
 var longerTimeoutBrowsers = ['Edge', 'Trident', 'Firefox'];
 var timeoutDuration = 0;
 for (var i = 0; i < longerTimeoutBrowsers.length; i += 1) {
@@ -53,7 +45,7 @@ function microtaskDebounce(fn) {
       return;
     }
     called = true;
-    window.Promise.resolve().then(function () {
+    Promise.resolve().then(function () {
       called = false;
       fn();
     });
@@ -110,7 +102,7 @@ function getStyleComputedProperty(element, property) {
     return [];
   }
   // NOTE: 1 DOM access here
-  var css = getComputedStyle(element, null);
+  var css = window.getComputedStyle(element, null);
   return property ? css[property] : css;
 }
 
@@ -138,7 +130,7 @@ function getParentNode(element) {
 function getScrollParent(element) {
   // Return body, `getScroll` will take care to get the correct `scrollTop` from it
   if (!element) {
-    return document.body;
+    return window.document.body;
   }
 
   switch (element.nodeName) {
@@ -180,7 +172,7 @@ function getOffsetParent(element) {
       return element.ownerDocument.documentElement;
     }
 
-    return document.documentElement;
+    return window.document.documentElement;
   }
 
   // .offsetParent will return the closest TD or TABLE in case
@@ -227,7 +219,7 @@ function getRoot(node) {
 function findCommonOffsetParent(element1, element2) {
   // This check is needed to avoid errors in case one of the elements isn't defined for any reason
   if (!element1 || !element1.nodeType || !element2 || !element2.nodeType) {
-    return document.documentElement;
+    return window.document.documentElement;
   }
 
   // Here we make sure to give as "start" the element that comes first in the DOM
@@ -319,7 +311,7 @@ function getBordersSize(styles, axis) {
   var sideA = axis === 'x' ? 'Left' : 'Top';
   var sideB = sideA === 'Left' ? 'Right' : 'Bottom';
 
-  return parseFloat(styles['border' + sideA + 'Width'], 10) + parseFloat(styles['border' + sideB + 'Width'], 10);
+  return +styles['border' + sideA + 'Width'].split('px')[0] + +styles['border' + sideB + 'Width'].split('px')[0];
 }
 
 /**
@@ -342,9 +334,9 @@ function getSize(axis, body, html, computedStyle) {
 }
 
 function getWindowSizes() {
-  var body = document.body;
-  var html = document.documentElement;
-  var computedStyle = isIE10$1() && getComputedStyle(html);
+  var body = window.document.body;
+  var html = window.document.documentElement;
+  var computedStyle = isIE10$1() && window.getComputedStyle(html);
 
   return {
     height: getSize('Height', body, html, computedStyle),
@@ -487,8 +479,8 @@ function getOffsetRectRelativeToArbitraryNode(children, parent) {
   var scrollParent = getScrollParent(children);
 
   var styles = getStyleComputedProperty(parent);
-  var borderTopWidth = parseFloat(styles.borderTopWidth, 10);
-  var borderLeftWidth = parseFloat(styles.borderLeftWidth, 10);
+  var borderTopWidth = +styles.borderTopWidth.split('px')[0];
+  var borderLeftWidth = +styles.borderLeftWidth.split('px')[0];
 
   var offsets = getClientRect({
     top: childrenRect.top - parentRect.top - borderTopWidth,
@@ -504,8 +496,8 @@ function getOffsetRectRelativeToArbitraryNode(children, parent) {
   // differently when margins are applied to it. The margins are included in
   // the box of the documentElement, in the other cases not.
   if (!isIE10 && isHTML) {
-    var marginTop = parseFloat(styles.marginTop, 10);
-    var marginLeft = parseFloat(styles.marginLeft, 10);
+    var marginTop = +styles.marginTop.split('px')[0];
+    var marginLeft = +styles.marginLeft.split('px')[0];
 
     offsets.top -= borderTopWidth - marginTop;
     offsets.bottom -= borderTopWidth - marginTop;
@@ -584,7 +576,7 @@ function getBoundaries(popper, reference, padding, boundariesElement) {
     // Handle other cases based on DOM element used as boundaries
     var boundariesNode = void 0;
     if (boundariesElement === 'scrollParent') {
-      boundariesNode = getScrollParent(getParentNode(reference));
+      boundariesNode = getScrollParent(getParentNode(popper));
       if (boundariesNode.nodeName === 'BODY') {
         boundariesNode = popper.ownerDocument.documentElement;
       }
@@ -710,7 +702,7 @@ function getReferenceOffsets(state, popper, reference) {
  * @returns {Object} object containing width and height properties
  */
 function getOuterSizes(element) {
-  var styles = getComputedStyle(element);
+  var styles = window.getComputedStyle(element);
   var x = parseFloat(styles.marginTop) + parseFloat(styles.marginBottom);
   var y = parseFloat(styles.marginLeft) + parseFloat(styles.marginRight);
   var result = {
@@ -927,7 +919,7 @@ function getSupportedPropertyName(property) {
   for (var i = 0; i < prefixes.length - 1; i++) {
     var prefix = prefixes[i];
     var toCheck = prefix ? '' + prefix + upperProp : property;
-    if (typeof document.body.style[toCheck] !== 'undefined') {
+    if (typeof window.document.body.style[toCheck] !== 'undefined') {
       return toCheck;
     }
   }
@@ -1046,7 +1038,7 @@ function removeEventListeners(reference, state) {
  */
 function disableEventListeners() {
   if (this.state.eventsEnabled) {
-    cancelAnimationFrame(this.scheduleUpdate);
+    window.cancelAnimationFrame(this.scheduleUpdate);
     this.state = removeEventListeners(this.reference, this.state);
   }
 }
@@ -1286,8 +1278,6 @@ function isModifierRequired(modifiers, requestingName, requestedName) {
  * @returns {Object} The data object, properly modified
  */
 function arrow(data, options) {
-  var _data$offsets$arrow;
-
   // arrow depends on keepTogether in order to work
   if (!isModifierRequired(data.instance.modifiers, 'arrow', 'keepTogether')) {
     return data;
@@ -1339,23 +1329,22 @@ function arrow(data, options) {
   if (reference[side] + arrowElementSize > popper[opSide]) {
     data.offsets.popper[side] += reference[side] + arrowElementSize - popper[opSide];
   }
-  data.offsets.popper = getClientRect(data.offsets.popper);
 
   // compute center of the popper
   var center = reference[side] + reference[len] / 2 - arrowElementSize / 2;
 
   // Compute the sideValue using the updated popper offsets
   // take popper margin in account because we don't have this info available
-  var css = getStyleComputedProperty(data.instance.popper);
-  var popperMarginSide = parseFloat(css['margin' + sideCapitalized], 10);
-  var popperBorderSide = parseFloat(css['border' + sideCapitalized + 'Width'], 10);
-  var sideValue = center - data.offsets.popper[side] - popperMarginSide - popperBorderSide;
+  var popperMarginSide = getStyleComputedProperty(data.instance.popper, 'margin' + sideCapitalized).replace('px', '');
+  var sideValue = center - getClientRect(data.offsets.popper)[side] - popperMarginSide;
 
   // prevent arrowElement from being placed not contiguously to its popper
   sideValue = Math.max(Math.min(popper[len] - arrowElementSize, sideValue), 0);
 
   data.arrowElement = arrowElement;
-  data.offsets.arrow = (_data$offsets$arrow = {}, defineProperty(_data$offsets$arrow, side, Math.round(sideValue)), defineProperty(_data$offsets$arrow, altSide, ''), _data$offsets$arrow);
+  data.offsets.arrow = {};
+  data.offsets.arrow[side] = Math.round(sideValue);
+  data.offsets.arrow[altSide] = ''; // make sure to unset any eventual altSide value from the DOM node
 
   return data;
 }
diff --git a/lib/thirdpartylibs.xml b/lib/thirdpartylibs.xml
index 6c3b3b46a6c..bd233869c43 100644
--- a/lib/thirdpartylibs.xml
+++ b/lib/thirdpartylibs.xml
@@ -307,7 +307,7 @@
     <location>amd/src/popper.js</location>
     <name>Popper.js</name>
     <license>MIT</license>
-    <version>v1.12.9</version>
+    <version>v1.12.6</version>
     <licenseversion></licenseversion>
   </library>
 </libraries>