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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: */