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diff --git a/helpcontent2/help3xsl/polyfills.js b/helpcontent2/help3xsl/polyfills.js
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+++ b/helpcontent2/help3xsl/polyfills.js
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+// This file can be removed, when we stop supporting IE11.
+// Polyfill for .before()
+// from: https://github.com/jserz/js_piece/blob/master/DOM/ChildNode/before()/before().md
+// Copyright (c) 2016-present, jszhou
+// MIT License
+(function (arr) {
+  arr.forEach(function (item) {
+    if (item.hasOwnProperty('before')) {
+      return;
+    }
+    Object.defineProperty(item, 'before', {
+      configurable: true,
+      enumerable: true,
+      writable: true,
+      value: function before() {
+        var argArr = Array.prototype.slice.call(arguments),
+          docFrag = document.createDocumentFragment();
+
+        argArr.forEach(function (argItem) {
+          var isNode = argItem instanceof Node;
+          docFrag.appendChild(isNode ? argItem : document.createTextNode(String(argItem)));
+        });
+
+        this.parentNode.insertBefore(docFrag, this);
+      }
+    });
+  });
+})([Element.prototype, CharacterData.prototype, DocumentType.prototype]);
+// Polyfill for .startsWith()
+// from: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/startsWith#Polyfill
+if (!String.prototype.startsWith) {
+    Object.defineProperty(String.prototype, 'startsWith', {
+        value: function(search, pos) {
+            pos = !pos || pos < 0 ? 0 : +pos;
+            return this.substring(pos, pos + search.length) === search;
+        }
+    });
+}
+// Polyfill for .matches()
+// from: https://developer.mozilla.org/en-US/docs/Web/API/Element/matches#Polyfill
+if (!Element.prototype.matches) {
+  Element.prototype.matches = Element.prototype.msMatchesSelector ||
+                              Element.prototype.webkitMatchesSelector;
+}
+// Polyfill for iterable Set (IE11)
+// from: https://stackoverflow.com/a/45686452/3057764
+if (new Set([0]).size === 0) {
+    //constructor doesn't take an iterable as an argument - thanks IE
+    const BuiltinSet = Set;
+    Set = function Set(iterable) {
+        const set = new BuiltinSet();
+        if (iterable) {
+            iterable.forEach(set.add, set);
+        }
+        return set;
+    };
+    Set.prototype = BuiltinSet.prototype;
+    Set.prototype.constructor = Set;
+}
+// Polyfill for using :scope in querySelector/querySelectorAll
+// from: https://github.com/lazd/scopedQuerySelectorShim
+// Copyright (C) 2015 Larry Davis
+// This software may be modified and distributed under the terms of the BSD license.
+(function() {
+    if (!HTMLElement.prototype.querySelectorAll) {
+        throw new Error("rootedQuerySelectorAll: This polyfill can only be used with browsers that support querySelectorAll");
+    }
+    // A temporary element to query against for elements not currently in the DOM
+    // We'll also use this element to test for :scope support
+    var container = document.createElement("div");
+    // Check if the browser supports :scope
+    try {
+        // Browser supports :scope, do nothing
+        container.querySelectorAll(":scope *");
+    } catch (e) {
+        // Match usage of scope
+        var scopeRE = /^\s*:scope/gi;
+        // Overrides
+        function overrideNodeMethod(prototype, methodName) {
+            // Store the old method for use later
+            var oldMethod = prototype[methodName];
+            // Override the method
+            prototype[methodName] = function(query) {
+                var nodeList, gaveId = false, gaveContainer = false;
+                if (query.match(scopeRE)) {
+                    // Remove :scope
+                    query = query.replace(scopeRE, "");
+                    if (!this.parentNode) {
+                        // Add to temporary container
+                        container.appendChild(this);
+                        gaveContainer = true;
+                    }
+                    parentNode = this.parentNode;
+                    if (!this.id) {
+                        // Give temporary ID
+                        this.id = "rootedQuerySelector_id_" + new Date().getTime();
+                        gaveId = true;
+                    }
+                    // Find elements against parent node
+                    nodeList = oldMethod.call(parentNode, "#" + this.id + " " + query);
+                    // Reset the ID
+                    if (gaveId) {
+                        this.id = "";
+                    }
+                    // Remove from temporary container
+                    if (gaveContainer) {
+                        container.removeChild(this);
+                    }
+                    return nodeList;
+                } else {
+                    // No immediate child selector used
+                    return oldMethod.call(this, query);
+                }
+            };
+        }
+        // Browser doesn't support :scope, add polyfill
+        overrideNodeMethod(HTMLElement.prototype, "querySelector");
+        overrideNodeMethod(HTMLElement.prototype, "querySelectorAll");
+    }
+})();
+/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */