From 4861a40b9eb966787f9ebd3c044e84963f175baa Mon Sep 17 00:00:00 2001
From: joyqi <joyqi@segmentfault.com>
Date: Tue, 8 Jun 2021 11:47:03 +0800
Subject: [PATCH] fix #1100

---
 admin/css/style.css                    |    2 +
 admin/editor-js.php                    |    5 +-
 admin/js/purify.js                     |    1 +
 admin/src/js/purify.js                 | 1356 ++++++++++++++++++++++++
 admin/src/scss/components/_editor.scss |    9 +
 5 files changed, 1371 insertions(+), 2 deletions(-)
 create mode 100644 admin/js/purify.js
 create mode 100644 admin/src/js/purify.js

diff --git a/admin/css/style.css b/admin/css/style.css
index 07cd285e97..da83697c3e 100644
--- a/admin/css/style.css
+++ b/admin/css/style.css
@@ -826,6 +826,8 @@ a.operate-reply { color: #545c30; }
 
 #wmd-preview .summary:after { display: block; margin: 2em 0; background: #FFF9E8; color: #cf9900; font-size: .85714em; text-align: center; content: "- more -"; }
 
+#wmd-preview .embed { border: 1px solid #ccc; height: 40px; overflow: hidden; line-height: 40px; text-align: center; font-size: 12px; color: #777; }
+
 #wmd-preview table { width: 100%; }
 
 #wmd-preview table th, #wmd-preview table td { border: 1px solid #DDD; padding: 5px 8px; word-break: break-all; }
diff --git a/admin/editor-js.php b/admin/editor-js.php
index 5c14307f62..cc625ca611 100644
--- a/admin/editor-js.php
+++ b/admin/editor-js.php
@@ -3,6 +3,7 @@
 <script src="<?php $options->adminStaticUrl('js', 'hyperdown.js?v=' . $suffixVersion); ?>"></script>
 <script src="<?php $options->adminStaticUrl('js', 'pagedown.js?v=' . $suffixVersion); ?>"></script>
 <script src="<?php $options->adminStaticUrl('js', 'paste.js?v=' . $suffixVersion); ?>"></script>
+<script src="<?php $options->adminStaticUrl('js', 'purify.js?v=' . $suffixVersion); ?>"></script>
 <script>
 $(document).ready(function () {
     var textarea = $('#text'),
@@ -85,11 +86,11 @@
                 src = src.substring(0, src.length - 1);
             }
 
-            return '<div style="border: 1px solid #ccc; height: 40px; overflow: hidden; line-height: 40px; text-align: center; font-size: 12px; color: #777"><strong>'
+            return '<div class="embed"><strong>'
                 + tag + '</strong> : ' + $.trim(src) + '</div>';
         });
 
-        return html;
+        return DOMPurify.sanitize(html, {USE_PROFILES: {html: true}});
     });
 
     editor.hooks.chain('onPreviewRefresh', function () {
diff --git a/admin/js/purify.js b/admin/js/purify.js
new file mode 100644
index 0000000000..004802757c
--- /dev/null
+++ b/admin/js/purify.js
@@ -0,0 +1 @@
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diff --git a/admin/src/js/purify.js b/admin/src/js/purify.js
new file mode 100644
index 0000000000..740524d0db
--- /dev/null
+++ b/admin/src/js/purify.js
@@ -0,0 +1,1356 @@
+/*! @license DOMPurify | (c) Cure53 and other contributors | Released under the Apache license 2.0 and Mozilla Public License 2.0 | github.com/cure53/DOMPurify/blob/2.2.2/LICENSE */
+
+(function (global, factory) {
+  typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
+  typeof define === 'function' && define.amd ? define(factory) :
+  (global = global || self, global.DOMPurify = factory());
+}(this, function () { 'use strict';
+
+  function _toConsumableArray(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } else { return Array.from(arr); } }
+
+  var hasOwnProperty = Object.hasOwnProperty,
+      setPrototypeOf = Object.setPrototypeOf,
+      isFrozen = Object.isFrozen,
+      getPrototypeOf = Object.getPrototypeOf,
+      getOwnPropertyDescriptor = Object.getOwnPropertyDescriptor;
+  var freeze = Object.freeze,
+      seal = Object.seal,
+      create = Object.create; // eslint-disable-line import/no-mutable-exports
+
+  var _ref = typeof Reflect !== 'undefined' && Reflect,
+      apply = _ref.apply,
+      construct = _ref.construct;
+
+  if (!apply) {
+    apply = function apply(fun, thisValue, args) {
+      return fun.apply(thisValue, args);
+    };
+  }
+
+  if (!freeze) {
+    freeze = function freeze(x) {
+      return x;
+    };
+  }
+
+  if (!seal) {
+    seal = function seal(x) {
+      return x;
+    };
+  }
+
+  if (!construct) {
+    construct = function construct(Func, args) {
+      return new (Function.prototype.bind.apply(Func, [null].concat(_toConsumableArray(args))))();
+    };
+  }
+
+  var arrayForEach = unapply(Array.prototype.forEach);
+  var arrayPop = unapply(Array.prototype.pop);
+  var arrayPush = unapply(Array.prototype.push);
+
+  var stringToLowerCase = unapply(String.prototype.toLowerCase);
+  var stringMatch = unapply(String.prototype.match);
+  var stringReplace = unapply(String.prototype.replace);
+  var stringIndexOf = unapply(String.prototype.indexOf);
+  var stringTrim = unapply(String.prototype.trim);
+
+  var regExpTest = unapply(RegExp.prototype.test);
+
+  var typeErrorCreate = unconstruct(TypeError);
+
+  function unapply(func) {
+    return function (thisArg) {
+      for (var _len = arguments.length, args = Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
+        args[_key - 1] = arguments[_key];
+      }
+
+      return apply(func, thisArg, args);
+    };
+  }
+
+  function unconstruct(func) {
+    return function () {
+      for (var _len2 = arguments.length, args = Array(_len2), _key2 = 0; _key2 < _len2; _key2++) {
+        args[_key2] = arguments[_key2];
+      }
+
+      return construct(func, args);
+    };
+  }
+
+  /* Add properties to a lookup table */
+  function addToSet(set, array) {
+    if (setPrototypeOf) {
+      // Make 'in' and truthy checks like Boolean(set.constructor)
+      // independent of any properties defined on Object.prototype.
+      // Prevent prototype setters from intercepting set as a this value.
+      setPrototypeOf(set, null);
+    }
+
+    var l = array.length;
+    while (l--) {
+      var element = array[l];
+      if (typeof element === 'string') {
+        var lcElement = stringToLowerCase(element);
+        if (lcElement !== element) {
+          // Config presets (e.g. tags.js, attrs.js) are immutable.
+          if (!isFrozen(array)) {
+            array[l] = lcElement;
+          }
+
+          element = lcElement;
+        }
+      }
+
+      set[element] = true;
+    }
+
+    return set;
+  }
+
+  /* Shallow clone an object */
+  function clone(object) {
+    var newObject = create(null);
+
+    var property = void 0;
+    for (property in object) {
+      if (apply(hasOwnProperty, object, [property])) {
+        newObject[property] = object[property];
+      }
+    }
+
+    return newObject;
+  }
+
+  /* IE10 doesn't support __lookupGetter__ so lets'
+   * simulate it. It also automatically checks
+   * if the prop is function or getter and behaves
+   * accordingly. */
+  function lookupGetter(object, prop) {
+    while (object !== null) {
+      var desc = getOwnPropertyDescriptor(object, prop);
+      if (desc) {
+        if (desc.get) {
+          return unapply(desc.get);
+        }
+
+        if (typeof desc.value === 'function') {
+          return unapply(desc.value);
+        }
+      }
+
+      object = getPrototypeOf(object);
+    }
+
+    function fallbackValue(element) {
+      console.warn('fallback value for', element);
+      return null;
+    }
+
+    return fallbackValue;
+  }
+
+  var html = freeze(['a', 'abbr', 'acronym', 'address', 'area', 'article', 'aside', 'audio', 'b', 'bdi', 'bdo', 'big', 'blink', 'blockquote', 'body', 'br', 'button', 'canvas', 'caption', 'center', 'cite', 'code', 'col', 'colgroup', 'content', 'data', 'datalist', 'dd', 'decorator', 'del', 'details', 'dfn', 'dialog', 'dir', 'div', 'dl', 'dt', 'element', 'em', 'fieldset', 'figcaption', 'figure', 'font', 'footer', 'form', 'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'head', 'header', 'hgroup', 'hr', 'html', 'i', 'img', 'input', 'ins', 'kbd', 'label', 'legend', 'li', 'main', 'map', 'mark', 'marquee', 'menu', 'menuitem', 'meter', 'nav', 'nobr', 'ol', 'optgroup', 'option', 'output', 'p', 'picture', 'pre', 'progress', 'q', 'rp', 'rt', 'ruby', 's', 'samp', 'section', 'select', 'shadow', 'small', 'source', 'spacer', 'span', 'strike', 'strong', 'style', 'sub', 'summary', 'sup', 'table', 'tbody', 'td', 'template', 'textarea', 'tfoot', 'th', 'thead', 'time', 'tr', 'track', 'tt', 'u', 'ul', 'var', 'video', 'wbr']);
+
+  // SVG
+  var svg = freeze(['svg', 'a', 'altglyph', 'altglyphdef', 'altglyphitem', 'animatecolor', 'animatemotion', 'animatetransform', 'circle', 'clippath', 'defs', 'desc', 'ellipse', 'filter', 'font', 'g', 'glyph', 'glyphref', 'hkern', 'image', 'line', 'lineargradient', 'marker', 'mask', 'metadata', 'mpath', 'path', 'pattern', 'polygon', 'polyline', 'radialgradient', 'rect', 'stop', 'style', 'switch', 'symbol', 'text', 'textpath', 'title', 'tref', 'tspan', 'view', 'vkern']);
+
+  var svgFilters = freeze(['feBlend', 'feColorMatrix', 'feComponentTransfer', 'feComposite', 'feConvolveMatrix', 'feDiffuseLighting', 'feDisplacementMap', 'feDistantLight', 'feFlood', 'feFuncA', 'feFuncB', 'feFuncG', 'feFuncR', 'feGaussianBlur', 'feMerge', 'feMergeNode', 'feMorphology', 'feOffset', 'fePointLight', 'feSpecularLighting', 'feSpotLight', 'feTile', 'feTurbulence']);
+
+  // List of SVG elements that are disallowed by default.
+  // We still need to know them so that we can do namespace
+  // checks properly in case one wants to add them to
+  // allow-list.
+  var svgDisallowed = freeze(['animate', 'color-profile', 'cursor', 'discard', 'fedropshadow', 'feimage', 'font-face', 'font-face-format', 'font-face-name', 'font-face-src', 'font-face-uri', 'foreignobject', 'hatch', 'hatchpath', 'mesh', 'meshgradient', 'meshpatch', 'meshrow', 'missing-glyph', 'script', 'set', 'solidcolor', 'unknown', 'use']);
+
+  var mathMl = freeze(['math', 'menclose', 'merror', 'mfenced', 'mfrac', 'mglyph', 'mi', 'mlabeledtr', 'mmultiscripts', 'mn', 'mo', 'mover', 'mpadded', 'mphantom', 'mroot', 'mrow', 'ms', 'mspace', 'msqrt', 'mstyle', 'msub', 'msup', 'msubsup', 'mtable', 'mtd', 'mtext', 'mtr', 'munder', 'munderover']);
+
+  // Similarly to SVG, we want to know all MathML elements,
+  // even those that we disallow by default.
+  var mathMlDisallowed = freeze(['maction', 'maligngroup', 'malignmark', 'mlongdiv', 'mscarries', 'mscarry', 'msgroup', 'mstack', 'msline', 'msrow', 'semantics', 'annotation', 'annotation-xml', 'mprescripts', 'none']);
+
+  var text = freeze(['#text']);
+
+  var html$1 = freeze(['accept', 'action', 'align', 'alt', 'autocapitalize', 'autocomplete', 'autopictureinpicture', 'autoplay', 'background', 'bgcolor', 'border', 'capture', 'cellpadding', 'cellspacing', 'checked', 'cite', 'class', 'clear', 'color', 'cols', 'colspan', 'controls', 'controlslist', 'coords', 'crossorigin', 'datetime', 'decoding', 'default', 'dir', 'disabled', 'disablepictureinpicture', 'disableremoteplayback', 'download', 'draggable', 'enctype', 'enterkeyhint', 'face', 'for', 'headers', 'height', 'hidden', 'high', 'href', 'hreflang', 'id', 'inputmode', 'integrity', 'ismap', 'kind', 'label', 'lang', 'list', 'loading', 'loop', 'low', 'max', 'maxlength', 'media', 'method', 'min', 'minlength', 'multiple', 'muted', 'name', 'noshade', 'novalidate', 'nowrap', 'open', 'optimum', 'pattern', 'placeholder', 'playsinline', 'poster', 'preload', 'pubdate', 'radiogroup', 'readonly', 'rel', 'required', 'rev', 'reversed', 'role', 'rows', 'rowspan', 'spellcheck', 'scope', 'selected', 'shape', 'size', 'sizes', 'span', 'srclang', 'start', 'src', 'srcset', 'step', 'style', 'summary', 'tabindex', 'title', 'translate', 'type', 'usemap', 'valign', 'value', 'width', 'xmlns', 'slot']);
+
+  var svg$1 = freeze(['accent-height', 'accumulate', 'additive', 'alignment-baseline', 'ascent', 'attributename', 'attributetype', 'azimuth', 'basefrequency', 'baseline-shift', 'begin', 'bias', 'by', 'class', 'clip', 'clippathunits', 'clip-path', 'clip-rule', 'color', 'color-interpolation', 'color-interpolation-filters', 'color-profile', 'color-rendering', 'cx', 'cy', 'd', 'dx', 'dy', 'diffuseconstant', 'direction', 'display', 'divisor', 'dur', 'edgemode', 'elevation', 'end', 'fill', 'fill-opacity', 'fill-rule', 'filter', 'filterunits', 'flood-color', 'flood-opacity', 'font-family', 'font-size', 'font-size-adjust', 'font-stretch', 'font-style', 'font-variant', 'font-weight', 'fx', 'fy', 'g1', 'g2', 'glyph-name', 'glyphref', 'gradientunits', 'gradienttransform', 'height', 'href', 'id', 'image-rendering', 'in', 'in2', 'k', 'k1', 'k2', 'k3', 'k4', 'kerning', 'keypoints', 'keysplines', 'keytimes', 'lang', 'lengthadjust', 'letter-spacing', 'kernelmatrix', 'kernelunitlength', 'lighting-color', 'local', 'marker-end', 'marker-mid', 'marker-start', 'markerheight', 'markerunits', 'markerwidth', 'maskcontentunits', 'maskunits', 'max', 'mask', 'media', 'method', 'mode', 'min', 'name', 'numoctaves', 'offset', 'operator', 'opacity', 'order', 'orient', 'orientation', 'origin', 'overflow', 'paint-order', 'path', 'pathlength', 'patterncontentunits', 'patterntransform', 'patternunits', 'points', 'preservealpha', 'preserveaspectratio', 'primitiveunits', 'r', 'rx', 'ry', 'radius', 'refx', 'refy', 'repeatcount', 'repeatdur', 'restart', 'result', 'rotate', 'scale', 'seed', 'shape-rendering', 'specularconstant', 'specularexponent', 'spreadmethod', 'startoffset', 'stddeviation', 'stitchtiles', 'stop-color', 'stop-opacity', 'stroke-dasharray', 'stroke-dashoffset', 'stroke-linecap', 'stroke-linejoin', 'stroke-miterlimit', 'stroke-opacity', 'stroke', 'stroke-width', 'style', 'surfacescale', 'systemlanguage', 'tabindex', 'targetx', 'targety', 'transform', 'text-anchor', 'text-decoration', 'text-rendering', 'textlength', 'type', 'u1', 'u2', 'unicode', 'values', 'viewbox', 'visibility', 'version', 'vert-adv-y', 'vert-origin-x', 'vert-origin-y', 'width', 'word-spacing', 'wrap', 'writing-mode', 'xchannelselector', 'ychannelselector', 'x', 'x1', 'x2', 'xmlns', 'y', 'y1', 'y2', 'z', 'zoomandpan']);
+
+  var mathMl$1 = freeze(['accent', 'accentunder', 'align', 'bevelled', 'close', 'columnsalign', 'columnlines', 'columnspan', 'denomalign', 'depth', 'dir', 'display', 'displaystyle', 'encoding', 'fence', 'frame', 'height', 'href', 'id', 'largeop', 'length', 'linethickness', 'lspace', 'lquote', 'mathbackground', 'mathcolor', 'mathsize', 'mathvariant', 'maxsize', 'minsize', 'movablelimits', 'notation', 'numalign', 'open', 'rowalign', 'rowlines', 'rowspacing', 'rowspan', 'rspace', 'rquote', 'scriptlevel', 'scriptminsize', 'scriptsizemultiplier', 'selection', 'separator', 'separators', 'stretchy', 'subscriptshift', 'supscriptshift', 'symmetric', 'voffset', 'width', 'xmlns']);
+
+  var xml = freeze(['xlink:href', 'xml:id', 'xlink:title', 'xml:space', 'xmlns:xlink']);
+
+  // eslint-disable-next-line unicorn/better-regex
+  var MUSTACHE_EXPR = seal(/\{\{[\s\S]*|[\s\S]*\}\}/gm); // Specify template detection regex for SAFE_FOR_TEMPLATES mode
+  var ERB_EXPR = seal(/<%[\s\S]*|[\s\S]*%>/gm);
+  var DATA_ATTR = seal(/^data-[\-\w.\u00B7-\uFFFF]/); // eslint-disable-line no-useless-escape
+  var ARIA_ATTR = seal(/^aria-[\-\w]+$/); // eslint-disable-line no-useless-escape
+  var IS_ALLOWED_URI = seal(/^(?:(?:(?:f|ht)tps?|mailto|tel|callto|cid|xmpp):|[^a-z]|[a-z+.\-]+(?:[^a-z+.\-:]|$))/i // eslint-disable-line no-useless-escape
+  );
+  var IS_SCRIPT_OR_DATA = seal(/^(?:\w+script|data):/i);
+  var ATTR_WHITESPACE = seal(/[\u0000-\u0020\u00A0\u1680\u180E\u2000-\u2029\u205F\u3000]/g // eslint-disable-line no-control-regex
+  );
+
+  var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; };
+
+  function _toConsumableArray$1(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } else { return Array.from(arr); } }
+
+  var getGlobal = function getGlobal() {
+    return typeof window === 'undefined' ? null : window;
+  };
+
+  /**
+   * Creates a no-op policy for internal use only.
+   * Don't export this function outside this module!
+   * @param {?TrustedTypePolicyFactory} trustedTypes The policy factory.
+   * @param {Document} document The document object (to determine policy name suffix)
+   * @return {?TrustedTypePolicy} The policy created (or null, if Trusted Types
+   * are not supported).
+   */
+  var _createTrustedTypesPolicy = function _createTrustedTypesPolicy(trustedTypes, document) {
+    if ((typeof trustedTypes === 'undefined' ? 'undefined' : _typeof(trustedTypes)) !== 'object' || typeof trustedTypes.createPolicy !== 'function') {
+      return null;
+    }
+
+    // Allow the callers to control the unique policy name
+    // by adding a data-tt-policy-suffix to the script element with the DOMPurify.
+    // Policy creation with duplicate names throws in Trusted Types.
+    var suffix = null;
+    var ATTR_NAME = 'data-tt-policy-suffix';
+    if (document.currentScript && document.currentScript.hasAttribute(ATTR_NAME)) {
+      suffix = document.currentScript.getAttribute(ATTR_NAME);
+    }
+
+    var policyName = 'dompurify' + (suffix ? '#' + suffix : '');
+
+    try {
+      return trustedTypes.createPolicy(policyName, {
+        createHTML: function createHTML(html$$1) {
+          return html$$1;
+        }
+      });
+    } catch (_) {
+      // Policy creation failed (most likely another DOMPurify script has
+      // already run). Skip creating the policy, as this will only cause errors
+      // if TT are enforced.
+      console.warn('TrustedTypes policy ' + policyName + ' could not be created.');
+      return null;
+    }
+  };
+
+  function createDOMPurify() {
+    var window = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : getGlobal();
+
+    var DOMPurify = function DOMPurify(root) {
+      return createDOMPurify(root);
+    };
+
+    /**
+     * Version label, exposed for easier checks
+     * if DOMPurify is up to date or not
+     */
+    DOMPurify.version = '2.2.9';
+
+    /**
+     * Array of elements that DOMPurify removed during sanitation.
+     * Empty if nothing was removed.
+     */
+    DOMPurify.removed = [];
+
+    if (!window || !window.document || window.document.nodeType !== 9) {
+      // Not running in a browser, provide a factory function
+      // so that you can pass your own Window
+      DOMPurify.isSupported = false;
+
+      return DOMPurify;
+    }
+
+    var originalDocument = window.document;
+
+    var document = window.document;
+    var DocumentFragment = window.DocumentFragment,
+        HTMLTemplateElement = window.HTMLTemplateElement,
+        Node = window.Node,
+        Element = window.Element,
+        NodeFilter = window.NodeFilter,
+        _window$NamedNodeMap = window.NamedNodeMap,
+        NamedNodeMap = _window$NamedNodeMap === undefined ? window.NamedNodeMap || window.MozNamedAttrMap : _window$NamedNodeMap,
+        Text = window.Text,
+        Comment = window.Comment,
+        DOMParser = window.DOMParser,
+        trustedTypes = window.trustedTypes;
+
+
+    var ElementPrototype = Element.prototype;
+
+    var cloneNode = lookupGetter(ElementPrototype, 'cloneNode');
+    var getNextSibling = lookupGetter(ElementPrototype, 'nextSibling');
+    var getChildNodes = lookupGetter(ElementPrototype, 'childNodes');
+    var getParentNode = lookupGetter(ElementPrototype, 'parentNode');
+
+    // As per issue #47, the web-components registry is inherited by a
+    // new document created via createHTMLDocument. As per the spec
+    // (http://w3c.github.io/webcomponents/spec/custom/#creating-and-passing-registries)
+    // a new empty registry is used when creating a template contents owner
+    // document, so we use that as our parent document to ensure nothing
+    // is inherited.
+    if (typeof HTMLTemplateElement === 'function') {
+      var template = document.createElement('template');
+      if (template.content && template.content.ownerDocument) {
+        document = template.content.ownerDocument;
+      }
+    }
+
+    var trustedTypesPolicy = _createTrustedTypesPolicy(trustedTypes, originalDocument);
+    var emptyHTML = trustedTypesPolicy && RETURN_TRUSTED_TYPE ? trustedTypesPolicy.createHTML('') : '';
+
+    var _document = document,
+        implementation = _document.implementation,
+        createNodeIterator = _document.createNodeIterator,
+        createDocumentFragment = _document.createDocumentFragment;
+    var importNode = originalDocument.importNode;
+
+
+    var documentMode = {};
+    try {
+      documentMode = clone(document).documentMode ? document.documentMode : {};
+    } catch (_) {}
+
+    var hooks = {};
+
+    /**
+     * Expose whether this browser supports running the full DOMPurify.
+     */
+    DOMPurify.isSupported = typeof getParentNode === 'function' && implementation && typeof implementation.createHTMLDocument !== 'undefined' && documentMode !== 9;
+
+    var MUSTACHE_EXPR$$1 = MUSTACHE_EXPR,
+        ERB_EXPR$$1 = ERB_EXPR,
+        DATA_ATTR$$1 = DATA_ATTR,
+        ARIA_ATTR$$1 = ARIA_ATTR,
+        IS_SCRIPT_OR_DATA$$1 = IS_SCRIPT_OR_DATA,
+        ATTR_WHITESPACE$$1 = ATTR_WHITESPACE;
+    var IS_ALLOWED_URI$$1 = IS_ALLOWED_URI;
+
+    /**
+     * We consider the elements and attributes below to be safe. Ideally
+     * don't add any new ones but feel free to remove unwanted ones.
+     */
+
+    /* allowed element names */
+
+    var ALLOWED_TAGS = null;
+    var DEFAULT_ALLOWED_TAGS = addToSet({}, [].concat(_toConsumableArray$1(html), _toConsumableArray$1(svg), _toConsumableArray$1(svgFilters), _toConsumableArray$1(mathMl), _toConsumableArray$1(text)));
+
+    /* Allowed attribute names */
+    var ALLOWED_ATTR = null;
+    var DEFAULT_ALLOWED_ATTR = addToSet({}, [].concat(_toConsumableArray$1(html$1), _toConsumableArray$1(svg$1), _toConsumableArray$1(mathMl$1), _toConsumableArray$1(xml)));
+
+    /* Explicitly forbidden tags (overrides ALLOWED_TAGS/ADD_TAGS) */
+    var FORBID_TAGS = null;
+
+    /* Explicitly forbidden attributes (overrides ALLOWED_ATTR/ADD_ATTR) */
+    var FORBID_ATTR = null;
+
+    /* Decide if ARIA attributes are okay */
+    var ALLOW_ARIA_ATTR = true;
+
+    /* Decide if custom data attributes are okay */
+    var ALLOW_DATA_ATTR = true;
+
+    /* Decide if unknown protocols are okay */
+    var ALLOW_UNKNOWN_PROTOCOLS = false;
+
+    /* Output should be safe for common template engines.
+     * This means, DOMPurify removes data attributes, mustaches and ERB
+     */
+    var SAFE_FOR_TEMPLATES = false;
+
+    /* Decide if document with <html>... should be returned */
+    var WHOLE_DOCUMENT = false;
+
+    /* Track whether config is already set on this instance of DOMPurify. */
+    var SET_CONFIG = false;
+
+    /* Decide if all elements (e.g. style, script) must be children of
+     * document.body. By default, browsers might move them to document.head */
+    var FORCE_BODY = false;
+
+    /* Decide if a DOM `HTMLBodyElement` should be returned, instead of a html
+     * string (or a TrustedHTML object if Trusted Types are supported).
+     * If `WHOLE_DOCUMENT` is enabled a `HTMLHtmlElement` will be returned instead
+     */
+    var RETURN_DOM = false;
+
+    /* Decide if a DOM `DocumentFragment` should be returned, instead of a html
+     * string  (or a TrustedHTML object if Trusted Types are supported) */
+    var RETURN_DOM_FRAGMENT = false;
+
+    /* If `RETURN_DOM` or `RETURN_DOM_FRAGMENT` is enabled, decide if the returned DOM
+     * `Node` is imported into the current `Document`. If this flag is not enabled the
+     * `Node` will belong (its ownerDocument) to a fresh `HTMLDocument`, created by
+     * DOMPurify.
+     *
+     * This defaults to `true` starting DOMPurify 2.2.0. Note that setting it to `false`
+     * might cause XSS from attacks hidden in closed shadowroots in case the browser
+     * supports Declarative Shadow: DOM https://web.dev/declarative-shadow-dom/
+     */
+    var RETURN_DOM_IMPORT = true;
+
+    /* Try to return a Trusted Type object instead of a string, return a string in
+     * case Trusted Types are not supported  */
+    var RETURN_TRUSTED_TYPE = false;
+
+    /* Output should be free from DOM clobbering attacks? */
+    var SANITIZE_DOM = true;
+
+    /* Keep element content when removing element? */
+    var KEEP_CONTENT = true;
+
+    /* If a `Node` is passed to sanitize(), then performs sanitization in-place instead
+     * of importing it into a new Document and returning a sanitized copy */
+    var IN_PLACE = false;
+
+    /* Allow usage of profiles like html, svg and mathMl */
+    var USE_PROFILES = {};
+
+    /* Tags to ignore content of when KEEP_CONTENT is true */
+    var FORBID_CONTENTS = addToSet({}, ['annotation-xml', 'audio', 'colgroup', 'desc', 'foreignobject', 'head', 'iframe', 'math', 'mi', 'mn', 'mo', 'ms', 'mtext', 'noembed', 'noframes', 'noscript', 'plaintext', 'script', 'style', 'svg', 'template', 'thead', 'title', 'video', 'xmp']);
+
+    /* Tags that are safe for data: URIs */
+    var DATA_URI_TAGS = null;
+    var DEFAULT_DATA_URI_TAGS = addToSet({}, ['audio', 'video', 'img', 'source', 'image', 'track']);
+
+    /* Attributes safe for values like "javascript:" */
+    var URI_SAFE_ATTRIBUTES = null;
+    var DEFAULT_URI_SAFE_ATTRIBUTES = addToSet({}, ['alt', 'class', 'for', 'id', 'label', 'name', 'pattern', 'placeholder', 'summary', 'title', 'value', 'style', 'xmlns']);
+
+    var MATHML_NAMESPACE = 'http://www.w3.org/1998/Math/MathML';
+    var SVG_NAMESPACE = 'http://www.w3.org/2000/svg';
+    var HTML_NAMESPACE = 'http://www.w3.org/1999/xhtml';
+    /* Document namespace */
+    var NAMESPACE = HTML_NAMESPACE;
+    var IS_EMPTY_INPUT = false;
+
+    /* Keep a reference to config to pass to hooks */
+    var CONFIG = null;
+
+    /* Ideally, do not touch anything below this line */
+    /* ______________________________________________ */
+
+    var formElement = document.createElement('form');
+
+    /**
+     * _parseConfig
+     *
+     * @param  {Object} cfg optional config literal
+     */
+    // eslint-disable-next-line complexity
+    var _parseConfig = function _parseConfig(cfg) {
+      if (CONFIG && CONFIG === cfg) {
+        return;
+      }
+
+      /* Shield configuration object from tampering */
+      if (!cfg || (typeof cfg === 'undefined' ? 'undefined' : _typeof(cfg)) !== 'object') {
+        cfg = {};
+      }
+
+      /* Shield configuration object from prototype pollution */
+      cfg = clone(cfg);
+
+      /* Set configuration parameters */
+      ALLOWED_TAGS = 'ALLOWED_TAGS' in cfg ? addToSet({}, cfg.ALLOWED_TAGS) : DEFAULT_ALLOWED_TAGS;
+      ALLOWED_ATTR = 'ALLOWED_ATTR' in cfg ? addToSet({}, cfg.ALLOWED_ATTR) : DEFAULT_ALLOWED_ATTR;
+      URI_SAFE_ATTRIBUTES = 'ADD_URI_SAFE_ATTR' in cfg ? addToSet(clone(DEFAULT_URI_SAFE_ATTRIBUTES), cfg.ADD_URI_SAFE_ATTR) : DEFAULT_URI_SAFE_ATTRIBUTES;
+      DATA_URI_TAGS = 'ADD_DATA_URI_TAGS' in cfg ? addToSet(clone(DEFAULT_DATA_URI_TAGS), cfg.ADD_DATA_URI_TAGS) : DEFAULT_DATA_URI_TAGS;
+      FORBID_TAGS = 'FORBID_TAGS' in cfg ? addToSet({}, cfg.FORBID_TAGS) : {};
+      FORBID_ATTR = 'FORBID_ATTR' in cfg ? addToSet({}, cfg.FORBID_ATTR) : {};
+      USE_PROFILES = 'USE_PROFILES' in cfg ? cfg.USE_PROFILES : false;
+      ALLOW_ARIA_ATTR = cfg.ALLOW_ARIA_ATTR !== false; // Default true
+      ALLOW_DATA_ATTR = cfg.ALLOW_DATA_ATTR !== false; // Default true
+      ALLOW_UNKNOWN_PROTOCOLS = cfg.ALLOW_UNKNOWN_PROTOCOLS || false; // Default false
+      SAFE_FOR_TEMPLATES = cfg.SAFE_FOR_TEMPLATES || false; // Default false
+      WHOLE_DOCUMENT = cfg.WHOLE_DOCUMENT || false; // Default false
+      RETURN_DOM = cfg.RETURN_DOM || false; // Default false
+      RETURN_DOM_FRAGMENT = cfg.RETURN_DOM_FRAGMENT || false; // Default false
+      RETURN_DOM_IMPORT = cfg.RETURN_DOM_IMPORT !== false; // Default true
+      RETURN_TRUSTED_TYPE = cfg.RETURN_TRUSTED_TYPE || false; // Default false
+      FORCE_BODY = cfg.FORCE_BODY || false; // Default false
+      SANITIZE_DOM = cfg.SANITIZE_DOM !== false; // Default true
+      KEEP_CONTENT = cfg.KEEP_CONTENT !== false; // Default true
+      IN_PLACE = cfg.IN_PLACE || false; // Default false
+      IS_ALLOWED_URI$$1 = cfg.ALLOWED_URI_REGEXP || IS_ALLOWED_URI$$1;
+      NAMESPACE = cfg.NAMESPACE || HTML_NAMESPACE;
+      if (SAFE_FOR_TEMPLATES) {
+        ALLOW_DATA_ATTR = false;
+      }
+
+      if (RETURN_DOM_FRAGMENT) {
+        RETURN_DOM = true;
+      }
+
+      /* Parse profile info */
+      if (USE_PROFILES) {
+        ALLOWED_TAGS = addToSet({}, [].concat(_toConsumableArray$1(text)));
+        ALLOWED_ATTR = [];
+        if (USE_PROFILES.html === true) {
+          addToSet(ALLOWED_TAGS, html);
+          addToSet(ALLOWED_ATTR, html$1);
+        }
+
+        if (USE_PROFILES.svg === true) {
+          addToSet(ALLOWED_TAGS, svg);
+          addToSet(ALLOWED_ATTR, svg$1);
+          addToSet(ALLOWED_ATTR, xml);
+        }
+
+        if (USE_PROFILES.svgFilters === true) {
+          addToSet(ALLOWED_TAGS, svgFilters);
+          addToSet(ALLOWED_ATTR, svg$1);
+          addToSet(ALLOWED_ATTR, xml);
+        }
+
+        if (USE_PROFILES.mathMl === true) {
+          addToSet(ALLOWED_TAGS, mathMl);
+          addToSet(ALLOWED_ATTR, mathMl$1);
+          addToSet(ALLOWED_ATTR, xml);
+        }
+      }
+
+      /* Merge configuration parameters */
+      if (cfg.ADD_TAGS) {
+        if (ALLOWED_TAGS === DEFAULT_ALLOWED_TAGS) {
+          ALLOWED_TAGS = clone(ALLOWED_TAGS);
+        }
+
+        addToSet(ALLOWED_TAGS, cfg.ADD_TAGS);
+      }
+
+      if (cfg.ADD_ATTR) {
+        if (ALLOWED_ATTR === DEFAULT_ALLOWED_ATTR) {
+          ALLOWED_ATTR = clone(ALLOWED_ATTR);
+        }
+
+        addToSet(ALLOWED_ATTR, cfg.ADD_ATTR);
+      }
+
+      if (cfg.ADD_URI_SAFE_ATTR) {
+        addToSet(URI_SAFE_ATTRIBUTES, cfg.ADD_URI_SAFE_ATTR);
+      }
+
+      /* Add #text in case KEEP_CONTENT is set to true */
+      if (KEEP_CONTENT) {
+        ALLOWED_TAGS['#text'] = true;
+      }
+
+      /* Add html, head and body to ALLOWED_TAGS in case WHOLE_DOCUMENT is true */
+      if (WHOLE_DOCUMENT) {
+        addToSet(ALLOWED_TAGS, ['html', 'head', 'body']);
+      }
+
+      /* Add tbody to ALLOWED_TAGS in case tables are permitted, see #286, #365 */
+      if (ALLOWED_TAGS.table) {
+        addToSet(ALLOWED_TAGS, ['tbody']);
+        delete FORBID_TAGS.tbody;
+      }
+
+      // Prevent further manipulation of configuration.
+      // Not available in IE8, Safari 5, etc.
+      if (freeze) {
+        freeze(cfg);
+      }
+
+      CONFIG = cfg;
+    };
+
+    var MATHML_TEXT_INTEGRATION_POINTS = addToSet({}, ['mi', 'mo', 'mn', 'ms', 'mtext']);
+
+    var HTML_INTEGRATION_POINTS = addToSet({}, ['foreignobject', 'desc', 'title', 'annotation-xml']);
+
+    /* Keep track of all possible SVG and MathML tags
+     * so that we can perform the namespace checks
+     * correctly. */
+    var ALL_SVG_TAGS = addToSet({}, svg);
+    addToSet(ALL_SVG_TAGS, svgFilters);
+    addToSet(ALL_SVG_TAGS, svgDisallowed);
+
+    var ALL_MATHML_TAGS = addToSet({}, mathMl);
+    addToSet(ALL_MATHML_TAGS, mathMlDisallowed);
+
+    /**
+     *
+     *
+     * @param  {Element} element a DOM element whose namespace is being checked
+     * @returns {boolean} Return false if the element has a
+     *  namespace that a spec-compliant parser would never
+     *  return. Return true otherwise.
+     */
+    var _checkValidNamespace = function _checkValidNamespace(element) {
+      var parent = getParentNode(element);
+
+      // In JSDOM, if we're inside shadow DOM, then parentNode
+      // can be null. We just simulate parent in this case.
+      if (!parent || !parent.tagName) {
+        parent = {
+          namespaceURI: HTML_NAMESPACE,
+          tagName: 'template'
+        };
+      }
+
+      var tagName = stringToLowerCase(element.tagName);
+      var parentTagName = stringToLowerCase(parent.tagName);
+
+      if (element.namespaceURI === SVG_NAMESPACE) {
+        // The only way to switch from HTML namespace to SVG
+        // is via <svg>. If it happens via any other tag, then
+        // it should be killed.
+        if (parent.namespaceURI === HTML_NAMESPACE) {
+          return tagName === 'svg';
+        }
+
+        // The only way to switch from MathML to SVG is via
+        // svg if parent is either <annotation-xml> or MathML
+        // text integration points.
+        if (parent.namespaceURI === MATHML_NAMESPACE) {
+          return tagName === 'svg' && (parentTagName === 'annotation-xml' || MATHML_TEXT_INTEGRATION_POINTS[parentTagName]);
+        }
+
+        // We only allow elements that are defined in SVG
+        // spec. All others are disallowed in SVG namespace.
+        return Boolean(ALL_SVG_TAGS[tagName]);
+      }
+
+      if (element.namespaceURI === MATHML_NAMESPACE) {
+        // The only way to switch from HTML namespace to MathML
+        // is via <math>. If it happens via any other tag, then
+        // it should be killed.
+        if (parent.namespaceURI === HTML_NAMESPACE) {
+          return tagName === 'math';
+        }
+
+        // The only way to switch from SVG to MathML is via
+        // <math> and HTML integration points
+        if (parent.namespaceURI === SVG_NAMESPACE) {
+          return tagName === 'math' && HTML_INTEGRATION_POINTS[parentTagName];
+        }
+
+        // We only allow elements that are defined in MathML
+        // spec. All others are disallowed in MathML namespace.
+        return Boolean(ALL_MATHML_TAGS[tagName]);
+      }
+
+      if (element.namespaceURI === HTML_NAMESPACE) {
+        // The only way to switch from SVG to HTML is via
+        // HTML integration points, and from MathML to HTML
+        // is via MathML text integration points
+        if (parent.namespaceURI === SVG_NAMESPACE && !HTML_INTEGRATION_POINTS[parentTagName]) {
+          return false;
+        }
+
+        if (parent.namespaceURI === MATHML_NAMESPACE && !MATHML_TEXT_INTEGRATION_POINTS[parentTagName]) {
+          return false;
+        }
+
+        // Certain elements are allowed in both SVG and HTML
+        // namespace. We need to specify them explicitly
+        // so that they don't get erronously deleted from
+        // HTML namespace.
+        var commonSvgAndHTMLElements = addToSet({}, ['title', 'style', 'font', 'a', 'script']);
+
+        // We disallow tags that are specific for MathML
+        // or SVG and should never appear in HTML namespace
+        return !ALL_MATHML_TAGS[tagName] && (commonSvgAndHTMLElements[tagName] || !ALL_SVG_TAGS[tagName]);
+      }
+
+      // The code should never reach this place (this means
+      // that the element somehow got namespace that is not
+      // HTML, SVG or MathML). Return false just in case.
+      return false;
+    };
+
+    /**
+     * _forceRemove
+     *
+     * @param  {Node} node a DOM node
+     */
+    var _forceRemove = function _forceRemove(node) {
+      arrayPush(DOMPurify.removed, { element: node });
+      try {
+        // eslint-disable-next-line unicorn/prefer-dom-node-remove
+        node.parentNode.removeChild(node);
+      } catch (_) {
+        try {
+          node.outerHTML = emptyHTML;
+        } catch (_) {
+          node.remove();
+        }
+      }
+    };
+
+    /**
+     * _removeAttribute
+     *
+     * @param  {String} name an Attribute name
+     * @param  {Node} node a DOM node
+     */
+    var _removeAttribute = function _removeAttribute(name, node) {
+      try {
+        arrayPush(DOMPurify.removed, {
+          attribute: node.getAttributeNode(name),
+          from: node
+        });
+      } catch (_) {
+        arrayPush(DOMPurify.removed, {
+          attribute: null,
+          from: node
+        });
+      }
+
+      node.removeAttribute(name);
+
+      // We void attribute values for unremovable "is"" attributes
+      if (name === 'is' && !ALLOWED_ATTR[name]) {
+        if (RETURN_DOM || RETURN_DOM_FRAGMENT) {
+          try {
+            _forceRemove(node);
+          } catch (_) {}
+        } else {
+          try {
+            node.setAttribute(name, '');
+          } catch (_) {}
+        }
+      }
+    };
+
+    /**
+     * _initDocument
+     *
+     * @param  {String} dirty a string of dirty markup
+     * @return {Document} a DOM, filled with the dirty markup
+     */
+    var _initDocument = function _initDocument(dirty) {
+      /* Create a HTML document */
+      var doc = void 0;
+      var leadingWhitespace = void 0;
+
+      if (FORCE_BODY) {
+        dirty = '<remove></remove>' + dirty;
+      } else {
+        /* If FORCE_BODY isn't used, leading whitespace needs to be preserved manually */
+        var matches = stringMatch(dirty, /^[\r\n\t ]+/);
+        leadingWhitespace = matches && matches[0];
+      }
+
+      var dirtyPayload = trustedTypesPolicy ? trustedTypesPolicy.createHTML(dirty) : dirty;
+      /*
+       * Use the DOMParser API by default, fallback later if needs be
+       * DOMParser not work for svg when has multiple root element.
+       */
+      if (NAMESPACE === HTML_NAMESPACE) {
+        try {
+          doc = new DOMParser().parseFromString(dirtyPayload, 'text/html');
+        } catch (_) {}
+      }
+
+      /* Use createHTMLDocument in case DOMParser is not available */
+      if (!doc || !doc.documentElement) {
+        doc = implementation.createDocument(NAMESPACE, 'template', null);
+        try {
+          doc.documentElement.innerHTML = IS_EMPTY_INPUT ? '' : dirtyPayload;
+        } catch (_) {
+          // Syntax error if dirtyPayload is invalid xml
+        }
+      }
+
+      var body = doc.body || doc.documentElement;
+
+      if (dirty && leadingWhitespace) {
+        body.insertBefore(document.createTextNode(leadingWhitespace), body.childNodes[0] || null);
+      }
+
+      /* Work on whole document or just its body */
+      return WHOLE_DOCUMENT ? doc.documentElement : body;
+    };
+
+    /**
+     * _createIterator
+     *
+     * @param  {Document} root document/fragment to create iterator for
+     * @return {Iterator} iterator instance
+     */
+    var _createIterator = function _createIterator(root) {
+      return createNodeIterator.call(root.ownerDocument || root, root, NodeFilter.SHOW_ELEMENT | NodeFilter.SHOW_COMMENT | NodeFilter.SHOW_TEXT, null, false);
+    };
+
+    /**
+     * _isClobbered
+     *
+     * @param  {Node} elm element to check for clobbering attacks
+     * @return {Boolean} true if clobbered, false if safe
+     */
+    var _isClobbered = function _isClobbered(elm) {
+      if (elm instanceof Text || elm instanceof Comment) {
+        return false;
+      }
+
+      if (typeof elm.nodeName !== 'string' || typeof elm.textContent !== 'string' || typeof elm.removeChild !== 'function' || !(elm.attributes instanceof NamedNodeMap) || typeof elm.removeAttribute !== 'function' || typeof elm.setAttribute !== 'function' || typeof elm.namespaceURI !== 'string' || typeof elm.insertBefore !== 'function') {
+        return true;
+      }
+
+      return false;
+    };
+
+    /**
+     * _isNode
+     *
+     * @param  {Node} obj object to check whether it's a DOM node
+     * @return {Boolean} true is object is a DOM node
+     */
+    var _isNode = function _isNode(object) {
+      return (typeof Node === 'undefined' ? 'undefined' : _typeof(Node)) === 'object' ? object instanceof Node : object && (typeof object === 'undefined' ? 'undefined' : _typeof(object)) === 'object' && typeof object.nodeType === 'number' && typeof object.nodeName === 'string';
+    };
+
+    /**
+     * _executeHook
+     * Execute user configurable hooks
+     *
+     * @param  {String} entryPoint  Name of the hook's entry point
+     * @param  {Node} currentNode node to work on with the hook
+     * @param  {Object} data additional hook parameters
+     */
+    var _executeHook = function _executeHook(entryPoint, currentNode, data) {
+      if (!hooks[entryPoint]) {
+        return;
+      }
+
+      arrayForEach(hooks[entryPoint], function (hook) {
+        hook.call(DOMPurify, currentNode, data, CONFIG);
+      });
+    };
+
+    /**
+     * _sanitizeElements
+     *
+     * @protect nodeName
+     * @protect textContent
+     * @protect removeChild
+     *
+     * @param   {Node} currentNode to check for permission to exist
+     * @return  {Boolean} true if node was killed, false if left alive
+     */
+    var _sanitizeElements = function _sanitizeElements(currentNode) {
+      var content = void 0;
+
+      /* Execute a hook if present */
+      _executeHook('beforeSanitizeElements', currentNode, null);
+
+      /* Check if element is clobbered or can clobber */
+      if (_isClobbered(currentNode)) {
+        _forceRemove(currentNode);
+        return true;
+      }
+
+      /* Check if tagname contains Unicode */
+      if (stringMatch(currentNode.nodeName, /[\u0080-\uFFFF]/)) {
+        _forceRemove(currentNode);
+        return true;
+      }
+
+      /* Now let's check the element's type and name */
+      var tagName = stringToLowerCase(currentNode.nodeName);
+
+      /* Execute a hook if present */
+      _executeHook('uponSanitizeElement', currentNode, {
+        tagName: tagName,
+        allowedTags: ALLOWED_TAGS
+      });
+
+      /* Detect mXSS attempts abusing namespace confusion */
+      if (!_isNode(currentNode.firstElementChild) && (!_isNode(currentNode.content) || !_isNode(currentNode.content.firstElementChild)) && regExpTest(/<[/\w]/g, currentNode.innerHTML) && regExpTest(/<[/\w]/g, currentNode.textContent)) {
+        _forceRemove(currentNode);
+        return true;
+      }
+
+      /* Remove element if anything forbids its presence */
+      if (!ALLOWED_TAGS[tagName] || FORBID_TAGS[tagName]) {
+        /* Keep content except for bad-listed elements */
+        if (KEEP_CONTENT && !FORBID_CONTENTS[tagName]) {
+          var parentNode = getParentNode(currentNode) || currentNode.parentNode;
+          var childNodes = getChildNodes(currentNode) || currentNode.childNodes;
+
+          if (childNodes && parentNode) {
+            var childCount = childNodes.length;
+
+            for (var i = childCount - 1; i >= 0; --i) {
+              parentNode.insertBefore(cloneNode(childNodes[i], true), getNextSibling(currentNode));
+            }
+          }
+        }
+
+        _forceRemove(currentNode);
+        return true;
+      }
+
+      /* Check whether element has a valid namespace */
+      if (currentNode instanceof Element && !_checkValidNamespace(currentNode)) {
+        _forceRemove(currentNode);
+        return true;
+      }
+
+      if ((tagName === 'noscript' || tagName === 'noembed') && regExpTest(/<\/no(script|embed)/i, currentNode.innerHTML)) {
+        _forceRemove(currentNode);
+        return true;
+      }
+
+      /* Sanitize element content to be template-safe */
+      if (SAFE_FOR_TEMPLATES && currentNode.nodeType === 3) {
+        /* Get the element's text content */
+        content = currentNode.textContent;
+        content = stringReplace(content, MUSTACHE_EXPR$$1, ' ');
+        content = stringReplace(content, ERB_EXPR$$1, ' ');
+        if (currentNode.textContent !== content) {
+          arrayPush(DOMPurify.removed, { element: currentNode.cloneNode() });
+          currentNode.textContent = content;
+        }
+      }
+
+      /* Execute a hook if present */
+      _executeHook('afterSanitizeElements', currentNode, null);
+
+      return false;
+    };
+
+    /**
+     * _isValidAttribute
+     *
+     * @param  {string} lcTag Lowercase tag name of containing element.
+     * @param  {string} lcName Lowercase attribute name.
+     * @param  {string} value Attribute value.
+     * @return {Boolean} Returns true if `value` is valid, otherwise false.
+     */
+    // eslint-disable-next-line complexity
+    var _isValidAttribute = function _isValidAttribute(lcTag, lcName, value) {
+      /* Make sure attribute cannot clobber */
+      if (SANITIZE_DOM && (lcName === 'id' || lcName === 'name') && (value in document || value in formElement)) {
+        return false;
+      }
+
+      /* Allow valid data-* attributes: At least one character after "-"
+          (https://html.spec.whatwg.org/multipage/dom.html#embedding-custom-non-visible-data-with-the-data-*-attributes)
+          XML-compatible (https://html.spec.whatwg.org/multipage/infrastructure.html#xml-compatible and http://www.w3.org/TR/xml/#d0e804)
+          We don't need to check the value; it's always URI safe. */
+      if (ALLOW_DATA_ATTR && regExpTest(DATA_ATTR$$1, lcName)) ; else if (ALLOW_ARIA_ATTR && regExpTest(ARIA_ATTR$$1, lcName)) ; else if (!ALLOWED_ATTR[lcName] || FORBID_ATTR[lcName]) {
+        return false;
+
+        /* Check value is safe. First, is attr inert? If so, is safe */
+      } else if (URI_SAFE_ATTRIBUTES[lcName]) ; else if (regExpTest(IS_ALLOWED_URI$$1, stringReplace(value, ATTR_WHITESPACE$$1, ''))) ; else if ((lcName === 'src' || lcName === 'xlink:href' || lcName === 'href') && lcTag !== 'script' && stringIndexOf(value, 'data:') === 0 && DATA_URI_TAGS[lcTag]) ; else if (ALLOW_UNKNOWN_PROTOCOLS && !regExpTest(IS_SCRIPT_OR_DATA$$1, stringReplace(value, ATTR_WHITESPACE$$1, ''))) ; else if (!value) ; else {
+        return false;
+      }
+
+      return true;
+    };
+
+    /**
+     * _sanitizeAttributes
+     *
+     * @protect attributes
+     * @protect nodeName
+     * @protect removeAttribute
+     * @protect setAttribute
+     *
+     * @param  {Node} currentNode to sanitize
+     */
+    var _sanitizeAttributes = function _sanitizeAttributes(currentNode) {
+      var attr = void 0;
+      var value = void 0;
+      var lcName = void 0;
+      var l = void 0;
+      /* Execute a hook if present */
+      _executeHook('beforeSanitizeAttributes', currentNode, null);
+
+      var attributes = currentNode.attributes;
+
+      /* Check if we have attributes; if not we might have a text node */
+
+      if (!attributes) {
+        return;
+      }
+
+      var hookEvent = {
+        attrName: '',
+        attrValue: '',
+        keepAttr: true,
+        allowedAttributes: ALLOWED_ATTR
+      };
+      l = attributes.length;
+
+      /* Go backwards over all attributes; safely remove bad ones */
+      while (l--) {
+        attr = attributes[l];
+        var _attr = attr,
+            name = _attr.name,
+            namespaceURI = _attr.namespaceURI;
+
+        value = stringTrim(attr.value);
+        lcName = stringToLowerCase(name);
+
+        /* Execute a hook if present */
+        hookEvent.attrName = lcName;
+        hookEvent.attrValue = value;
+        hookEvent.keepAttr = true;
+        hookEvent.forceKeepAttr = undefined; // Allows developers to see this is a property they can set
+        _executeHook('uponSanitizeAttribute', currentNode, hookEvent);
+        value = hookEvent.attrValue;
+        /* Did the hooks approve of the attribute? */
+        if (hookEvent.forceKeepAttr) {
+          continue;
+        }
+
+        /* Remove attribute */
+        _removeAttribute(name, currentNode);
+
+        /* Did the hooks approve of the attribute? */
+        if (!hookEvent.keepAttr) {
+          continue;
+        }
+
+        /* Work around a security issue in jQuery 3.0 */
+        if (regExpTest(/\/>/i, value)) {
+          _removeAttribute(name, currentNode);
+          continue;
+        }
+
+        /* Sanitize attribute content to be template-safe */
+        if (SAFE_FOR_TEMPLATES) {
+          value = stringReplace(value, MUSTACHE_EXPR$$1, ' ');
+          value = stringReplace(value, ERB_EXPR$$1, ' ');
+        }
+
+        /* Is `value` valid for this attribute? */
+        var lcTag = currentNode.nodeName.toLowerCase();
+        if (!_isValidAttribute(lcTag, lcName, value)) {
+          continue;
+        }
+
+        /* Handle invalid data-* attribute set by try-catching it */
+        try {
+          if (namespaceURI) {
+            currentNode.setAttributeNS(namespaceURI, name, value);
+          } else {
+            /* Fallback to setAttribute() for browser-unrecognized namespaces e.g. "x-schema". */
+            currentNode.setAttribute(name, value);
+          }
+
+          arrayPop(DOMPurify.removed);
+        } catch (_) {}
+      }
+
+      /* Execute a hook if present */
+      _executeHook('afterSanitizeAttributes', currentNode, null);
+    };
+
+    /**
+     * _sanitizeShadowDOM
+     *
+     * @param  {DocumentFragment} fragment to iterate over recursively
+     */
+    var _sanitizeShadowDOM = function _sanitizeShadowDOM(fragment) {
+      var shadowNode = void 0;
+      var shadowIterator = _createIterator(fragment);
+
+      /* Execute a hook if present */
+      _executeHook('beforeSanitizeShadowDOM', fragment, null);
+
+      while (shadowNode = shadowIterator.nextNode()) {
+        /* Execute a hook if present */
+        _executeHook('uponSanitizeShadowNode', shadowNode, null);
+
+        /* Sanitize tags and elements */
+        if (_sanitizeElements(shadowNode)) {
+          continue;
+        }
+
+        /* Deep shadow DOM detected */
+        if (shadowNode.content instanceof DocumentFragment) {
+          _sanitizeShadowDOM(shadowNode.content);
+        }
+
+        /* Check attributes, sanitize if necessary */
+        _sanitizeAttributes(shadowNode);
+      }
+
+      /* Execute a hook if present */
+      _executeHook('afterSanitizeShadowDOM', fragment, null);
+    };
+
+    /**
+     * Sanitize
+     * Public method providing core sanitation functionality
+     *
+     * @param {String|Node} dirty string or DOM node
+     * @param {Object} configuration object
+     */
+    // eslint-disable-next-line complexity
+    DOMPurify.sanitize = function (dirty, cfg) {
+      var body = void 0;
+      var importedNode = void 0;
+      var currentNode = void 0;
+      var oldNode = void 0;
+      var returnNode = void 0;
+      /* Make sure we have a string to sanitize.
+        DO NOT return early, as this will return the wrong type if
+        the user has requested a DOM object rather than a string */
+      IS_EMPTY_INPUT = !dirty;
+      if (IS_EMPTY_INPUT) {
+        dirty = '<!-->';
+      }
+
+      /* Stringify, in case dirty is an object */
+      if (typeof dirty !== 'string' && !_isNode(dirty)) {
+        // eslint-disable-next-line no-negated-condition
+        if (typeof dirty.toString !== 'function') {
+          throw typeErrorCreate('toString is not a function');
+        } else {
+          dirty = dirty.toString();
+          if (typeof dirty !== 'string') {
+            throw typeErrorCreate('dirty is not a string, aborting');
+          }
+        }
+      }
+
+      /* Check we can run. Otherwise fall back or ignore */
+      if (!DOMPurify.isSupported) {
+        if (_typeof(window.toStaticHTML) === 'object' || typeof window.toStaticHTML === 'function') {
+          if (typeof dirty === 'string') {
+            return window.toStaticHTML(dirty);
+          }
+
+          if (_isNode(dirty)) {
+            return window.toStaticHTML(dirty.outerHTML);
+          }
+        }
+
+        return dirty;
+      }
+
+      /* Assign config vars */
+      if (!SET_CONFIG) {
+        _parseConfig(cfg);
+      }
+
+      /* Clean up removed elements */
+      DOMPurify.removed = [];
+
+      /* Check if dirty is correctly typed for IN_PLACE */
+      if (typeof dirty === 'string') {
+        IN_PLACE = false;
+      }
+
+      if (IN_PLACE) ; else if (dirty instanceof Node) {
+        /* If dirty is a DOM element, append to an empty document to avoid
+           elements being stripped by the parser */
+        body = _initDocument('<!---->');
+        importedNode = body.ownerDocument.importNode(dirty, true);
+        if (importedNode.nodeType === 1 && importedNode.nodeName === 'BODY') {
+          /* Node is already a body, use as is */
+          body = importedNode;
+        } else if (importedNode.nodeName === 'HTML') {
+          body = importedNode;
+        } else {
+          // eslint-disable-next-line unicorn/prefer-dom-node-append
+          body.appendChild(importedNode);
+        }
+      } else {
+        /* Exit directly if we have nothing to do */
+        if (!RETURN_DOM && !SAFE_FOR_TEMPLATES && !WHOLE_DOCUMENT &&
+        // eslint-disable-next-line unicorn/prefer-includes
+        dirty.indexOf('<') === -1) {
+          return trustedTypesPolicy && RETURN_TRUSTED_TYPE ? trustedTypesPolicy.createHTML(dirty) : dirty;
+        }
+
+        /* Initialize the document to work on */
+        body = _initDocument(dirty);
+
+        /* Check we have a DOM node from the data */
+        if (!body) {
+          return RETURN_DOM ? null : emptyHTML;
+        }
+      }
+
+      /* Remove first element node (ours) if FORCE_BODY is set */
+      if (body && FORCE_BODY) {
+        _forceRemove(body.firstChild);
+      }
+
+      /* Get node iterator */
+      var nodeIterator = _createIterator(IN_PLACE ? dirty : body);
+
+      /* Now start iterating over the created document */
+      while (currentNode = nodeIterator.nextNode()) {
+        /* Fix IE's strange behavior with manipulated textNodes #89 */
+        if (currentNode.nodeType === 3 && currentNode === oldNode) {
+          continue;
+        }
+
+        /* Sanitize tags and elements */
+        if (_sanitizeElements(currentNode)) {
+          continue;
+        }
+
+        /* Shadow DOM detected, sanitize it */
+        if (currentNode.content instanceof DocumentFragment) {
+          _sanitizeShadowDOM(currentNode.content);
+        }
+
+        /* Check attributes, sanitize if necessary */
+        _sanitizeAttributes(currentNode);
+
+        oldNode = currentNode;
+      }
+
+      oldNode = null;
+
+      /* If we sanitized `dirty` in-place, return it. */
+      if (IN_PLACE) {
+        return dirty;
+      }
+
+      /* Return sanitized string or DOM */
+      if (RETURN_DOM) {
+        if (RETURN_DOM_FRAGMENT) {
+          returnNode = createDocumentFragment.call(body.ownerDocument);
+
+          while (body.firstChild) {
+            // eslint-disable-next-line unicorn/prefer-dom-node-append
+            returnNode.appendChild(body.firstChild);
+          }
+        } else {
+          returnNode = body;
+        }
+
+        if (RETURN_DOM_IMPORT) {
+          /*
+            AdoptNode() is not used because internal state is not reset
+            (e.g. the past names map of a HTMLFormElement), this is safe
+            in theory but we would rather not risk another attack vector.
+            The state that is cloned by importNode() is explicitly defined
+            by the specs.
+          */
+          returnNode = importNode.call(originalDocument, returnNode, true);
+        }
+
+        return returnNode;
+      }
+
+      var serializedHTML = WHOLE_DOCUMENT ? body.outerHTML : body.innerHTML;
+
+      /* Sanitize final string template-safe */
+      if (SAFE_FOR_TEMPLATES) {
+        serializedHTML = stringReplace(serializedHTML, MUSTACHE_EXPR$$1, ' ');
+        serializedHTML = stringReplace(serializedHTML, ERB_EXPR$$1, ' ');
+      }
+
+      return trustedTypesPolicy && RETURN_TRUSTED_TYPE ? trustedTypesPolicy.createHTML(serializedHTML) : serializedHTML;
+    };
+
+    /**
+     * Public method to set the configuration once
+     * setConfig
+     *
+     * @param {Object} cfg configuration object
+     */
+    DOMPurify.setConfig = function (cfg) {
+      _parseConfig(cfg);
+      SET_CONFIG = true;
+    };
+
+    /**
+     * Public method to remove the configuration
+     * clearConfig
+     *
+     */
+    DOMPurify.clearConfig = function () {
+      CONFIG = null;
+      SET_CONFIG = false;
+    };
+
+    /**
+     * Public method to check if an attribute value is valid.
+     * Uses last set config, if any. Otherwise, uses config defaults.
+     * isValidAttribute
+     *
+     * @param  {string} tag Tag name of containing element.
+     * @param  {string} attr Attribute name.
+     * @param  {string} value Attribute value.
+     * @return {Boolean} Returns true if `value` is valid. Otherwise, returns false.
+     */
+    DOMPurify.isValidAttribute = function (tag, attr, value) {
+      /* Initialize shared config vars if necessary. */
+      if (!CONFIG) {
+        _parseConfig({});
+      }
+
+      var lcTag = stringToLowerCase(tag);
+      var lcName = stringToLowerCase(attr);
+      return _isValidAttribute(lcTag, lcName, value);
+    };
+
+    /**
+     * AddHook
+     * Public method to add DOMPurify hooks
+     *
+     * @param {String} entryPoint entry point for the hook to add
+     * @param {Function} hookFunction function to execute
+     */
+    DOMPurify.addHook = function (entryPoint, hookFunction) {
+      if (typeof hookFunction !== 'function') {
+        return;
+      }
+
+      hooks[entryPoint] = hooks[entryPoint] || [];
+      arrayPush(hooks[entryPoint], hookFunction);
+    };
+
+    /**
+     * RemoveHook
+     * Public method to remove a DOMPurify hook at a given entryPoint
+     * (pops it from the stack of hooks if more are present)
+     *
+     * @param {String} entryPoint entry point for the hook to remove
+     */
+    DOMPurify.removeHook = function (entryPoint) {
+      if (hooks[entryPoint]) {
+        arrayPop(hooks[entryPoint]);
+      }
+    };
+
+    /**
+     * RemoveHooks
+     * Public method to remove all DOMPurify hooks at a given entryPoint
+     *
+     * @param  {String} entryPoint entry point for the hooks to remove
+     */
+    DOMPurify.removeHooks = function (entryPoint) {
+      if (hooks[entryPoint]) {
+        hooks[entryPoint] = [];
+      }
+    };
+
+    /**
+     * RemoveAllHooks
+     * Public method to remove all DOMPurify hooks
+     *
+     */
+    DOMPurify.removeAllHooks = function () {
+      hooks = {};
+    };
+
+    return DOMPurify;
+  }
+
+  var purify = createDOMPurify();
+
+  return purify;
+
+}));
+//# sourceMappingURL=purify.js.map
diff --git a/admin/src/scss/components/_editor.scss b/admin/src/scss/components/_editor.scss
index 3805b90713..6a90927981 100644
--- a/admin/src/scss/components/_editor.scss
+++ b/admin/src/scss/components/_editor.scss
@@ -195,6 +195,15 @@
     text-align: center;
     content: "- more -";
   }
+  .embed {
+    border: 1px solid #ccc;
+    height: 40px;
+    overflow: hidden;
+    line-height: 40px;
+    text-align: center;
+    font-size: 12px;
+    color: #777;
+  }
 
   table {
     width: 100%;