converse-built/node_modules/dompurify/dist/purify.cjs.js

/*! @license DOMPurify 2.3.6 | (c) Cure53 and other contributors | Released under the Apache license 2.0 and Mozilla Public License 2.0 | github.com/cure53/DOMPurify/blob/2.3.6/LICENSE */

'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', 'feImage', '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', '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', 'nonce', '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', 'transform-origin', '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 DOCTYPE_NAME = seal(/^html$/i);

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 = '2.3.6';

  /**
   * 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,
      HTMLFormElement = window.HTMLFormElement,
      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 ? trustedTypesPolicy.createHTML('') : '';

  var _document = document,
      implementation = _document.implementation,
      createNodeIterator = _document.createNodeIterator,
      createDocumentFragment = _document.createDocumentFragment,
      getElementsByTagName = _document.getElementsByTagName;
  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)));

  /*
   * Configure how DOMPUrify should handle custom elements and their attributes as well as customized built-in elements.
   * @property {RegExp|Function|null} tagNameCheck one of [null, regexPattern, predicate]. Default: `null` (disallow any custom elements)
   * @property {RegExp|Function|null} attributeNameCheck one of [null, regexPattern, predicate]. Default: `null` (disallow any attributes not on the allow list)
   * @property {boolean} allowCustomizedBuiltInElements allow custom elements derived from built-ins if they pass CUSTOM_ELEMENT_HANDLING.tagNameCheck. Default: `false`.
   */
  var CUSTOM_ELEMENT_HANDLING = Object.seal(Object.create(null, {
    tagNameCheck: {
      writable: true,
      configurable: false,
      enumerable: true,
      value: null
    },
    attributeNameCheck: {
      writable: true,
      configurable: false,
      enumerable: true,
      value: null
    },
    allowCustomizedBuiltInElements: {
      writable: true,
      configurable: false,
      enumerable: true,
      value: false
    }
  }));

  /* 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;

  /* 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 = null;
  var DEFAULT_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', 'role', '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;

  /* Parsing of strict XHTML documents */
  var PARSER_MEDIA_TYPE = void 0;
  var SUPPORTED_PARSER_MEDIA_TYPES = ['application/xhtml+xml', 'text/html'];
  var DEFAULT_PARSER_MEDIA_TYPE = 'text/html';
  var transformCaseFunc = void 0;

  /* 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');

  var isRegexOrFunction = function isRegexOrFunction(testValue) {
    return testValue instanceof RegExp || testValue instanceof Function;
  };

  /**
   * _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_CONTENTS = 'FORBID_CONTENTS' in cfg ? addToSet({}, cfg.FORBID_CONTENTS) : DEFAULT_FORBID_CONTENTS;
    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_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 (cfg.CUSTOM_ELEMENT_HANDLING && isRegexOrFunction(cfg.CUSTOM_ELEMENT_HANDLING.tagNameCheck)) {
      CUSTOM_ELEMENT_HANDLING.tagNameCheck = cfg.CUSTOM_ELEMENT_HANDLING.tagNameCheck;
    }

    if (cfg.CUSTOM_ELEMENT_HANDLING && isRegexOrFunction(cfg.CUSTOM_ELEMENT_HANDLING.attributeNameCheck)) {
      CUSTOM_ELEMENT_HANDLING.attributeNameCheck = cfg.CUSTOM_ELEMENT_HANDLING.attributeNameCheck;
    }

    if (cfg.CUSTOM_ELEMENT_HANDLING && typeof cfg.CUSTOM_ELEMENT_HANDLING.allowCustomizedBuiltInElements === 'boolean') {
      CUSTOM_ELEMENT_HANDLING.allowCustomizedBuiltInElements = cfg.CUSTOM_ELEMENT_HANDLING.allowCustomizedBuiltInElements;
    }

    PARSER_MEDIA_TYPE =
    // eslint-disable-next-line unicorn/prefer-includes
    SUPPORTED_PARSER_MEDIA_TYPES.indexOf(cfg.PARSER_MEDIA_TYPE) === -1 ? PARSER_MEDIA_TYPE = DEFAULT_PARSER_MEDIA_TYPE : PARSER_MEDIA_TYPE = cfg.PARSER_MEDIA_TYPE;

    // HTML tags and attributes are not case-sensitive, converting to lowercase. Keeping XHTML as is.
    transformCaseFunc = PARSER_MEDIA_TYPE === 'application/xhtml+xml' ? function (x) {
      return x;
    } : stringToLowerCase;

    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);
    }

    if (cfg.FORBID_CONTENTS) {
      if (FORBID_CONTENTS === DEFAULT_FORBID_CONTENTS) {
        FORBID_CONTENTS = clone(FORBID_CONTENTS);
      }

      addToSet(FORBID_CONTENTS, cfg.FORBID_CONTENTS);
    }

    /* 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];
    }

    if (PARSER_MEDIA_TYPE === 'application/xhtml+xml') {
      // Root of XHTML doc must contain xmlns declaration (see https://www.w3.org/TR/xhtml1/normative.html#strict)
      dirty = '<html xmlns="http://www.w3.org/1999/xhtml"><head></head><body>' + dirty + '</body></html>';
    }

    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, PARSER_MEDIA_TYPE);
      } 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 */
    if (NAMESPACE === HTML_NAMESPACE) {
      return getElementsByTagName.call(doc, WHOLE_DOCUMENT ? 'html' : 'body')[0];
    }

    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,
    // eslint-disable-next-line no-bitwise
    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) {
    return elm instanceof HTMLFormElement && (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');
  };

  /**
   * _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 = transformCaseFunc(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;
    }

    /* Mitigate a problem with templates inside select */
    if (tagName === 'select' && regExpTest(/<template/i, currentNode.innerHTML)) {
      _forceRemove(currentNode);
      return true;
    }

    /* Remove element if anything forbids its presence */
    if (!ALLOWED_TAGS[tagName] || FORBID_TAGS[tagName]) {
      /* Check if we have a custom element to handle */
      if (!FORBID_TAGS[tagName] && _basicCustomElementTest(tagName)) {
        if (CUSTOM_ELEMENT_HANDLING.tagNameCheck instanceof RegExp && regExpTest(CUSTOM_ELEMENT_HANDLING.tagNameCheck, tagName)) return false;
        if (CUSTOM_ELEMENT_HANDLING.tagNameCheck instanceof Function && CUSTOM_ELEMENT_HANDLING.tagNameCheck(tagName)) return false;
      }

      /* 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 && !FORBID_ATTR[lcName] && regExpTest(DATA_ATTR$$1, lcName)) ; else if (ALLOW_ARIA_ATTR && regExpTest(ARIA_ATTR$$1, lcName)) ; else if (!ALLOWED_ATTR[lcName] || FORBID_ATTR[lcName]) {
      if (
      // First condition does a very basic check if a) it's basically a valid custom element tagname AND
      // b) if the tagName passes whatever the user has configured for CUSTOM_ELEMENT_HANDLING.tagNameCheck
      // and c) if the attribute name passes whatever the user has configured for CUSTOM_ELEMENT_HANDLING.attributeNameCheck
      _basicCustomElementTest(lcTag) && (CUSTOM_ELEMENT_HANDLING.tagNameCheck instanceof RegExp && regExpTest(CUSTOM_ELEMENT_HANDLING.tagNameCheck, lcTag) || CUSTOM_ELEMENT_HANDLING.tagNameCheck instanceof Function && CUSTOM_ELEMENT_HANDLING.tagNameCheck(lcTag)) && (CUSTOM_ELEMENT_HANDLING.attributeNameCheck instanceof RegExp && regExpTest(CUSTOM_ELEMENT_HANDLING.attributeNameCheck, lcName) || CUSTOM_ELEMENT_HANDLING.attributeNameCheck instanceof Function && CUSTOM_ELEMENT_HANDLING.attributeNameCheck(lcName)) ||
      // Alternative, second condition checks if it's an `is`-attribute, AND
      // the value passes whatever the user has configured for CUSTOM_ELEMENT_HANDLING.tagNameCheck
      lcName === 'is' && CUSTOM_ELEMENT_HANDLING.allowCustomizedBuiltInElements && (CUSTOM_ELEMENT_HANDLING.tagNameCheck instanceof RegExp && regExpTest(CUSTOM_ELEMENT_HANDLING.tagNameCheck, value) || CUSTOM_ELEMENT_HANDLING.tagNameCheck instanceof Function && CUSTOM_ELEMENT_HANDLING.tagNameCheck(value))) ; else {
        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;
  };

  /**
   * _basicCustomElementCheck
   * checks if at least one dash is included in tagName, and it's not the first char
   * for more sophisticated checking see https://github.com/sindresorhus/validate-element-name
   * @param {string} tagName name of the tag of the node to sanitize
   */
  var _basicCustomElementTest = function _basicCustomElementTest(tagName) {
    return tagName.indexOf('-') > 0;
  };

  /**
   * _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 = transformCaseFunc(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 = transformCaseFunc(currentNode.nodeName);
      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) {
      /* Do some early pre-sanitization to avoid unsafe root nodes */
      if (dirty.nodeName) {
        var tagName = transformCaseFunc(dirty.nodeName);
        if (!ALLOWED_TAGS[tagName] || FORBID_TAGS[tagName]) {
          throw typeErrorCreate('root node is forbidden and cannot be sanitized 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 : RETURN_TRUSTED_TYPE ? 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 (ALLOWED_ATTR.shadowroot) {
        /*
          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;

    /* Serialize doctype if allowed */
    if (WHOLE_DOCUMENT && ALLOWED_TAGS['!doctype'] && body.ownerDocument && body.ownerDocument.doctype && body.ownerDocument.doctype.name && regExpTest(DOCTYPE_NAME, body.ownerDocument.doctype.name)) {
      serializedHTML = '<!DOCTYPE ' + body.ownerDocument.doctype.name + '>\n' + serializedHTML;
    }

    /* 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 = transformCaseFunc(tag);
    var lcName = transformCaseFunc(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();

module.exports = purify;
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