rosenrot-browser

readability.js (88097B)

---

 /*eslint-env es6:false*/
 /*
  * Copyright (c) 2010 Arc90 Inc
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *     http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
 
 /*
  * This code is heavily based on Arc90's readability.js (1.7.1) script
  * available at: http://code.google.com/p/arc90labs-readability
  */
 
 /**
  * Public constructor.
  * @param {HTMLDocument} doc     The document to parse.
  * @param {Object}       options The options object.
  */
 function Readability(doc, options) {
   // In some older versions, people passed a URI as the first argument. Cope:
   if (options && options.documentElement) {
     doc = options;
     options = arguments[2];
   } else if (!doc || !doc.documentElement) {
     throw new Error(
       "First argument to Readability constructor should be a document object.",
     );
   }
   options = options || {};
 
   this._doc = doc;
   this._docJSDOMParser = this._doc.firstChild.__JSDOMParser__;
   this._articleTitle = null;
   this._articleByline = null;
   this._articleDir = null;
   this._articleSiteName = null;
   this._attempts = [];
 
   // Configurable options
   this._debug = !!options.debug;
   this._maxElemsToParse =
     options.maxElemsToParse || this.DEFAULT_MAX_ELEMS_TO_PARSE;
   this._nbTopCandidates =
     options.nbTopCandidates || this.DEFAULT_N_TOP_CANDIDATES;
   this._charThreshold = options.charThreshold || this.DEFAULT_CHAR_THRESHOLD;
   this._classesToPreserve = this.CLASSES_TO_PRESERVE.concat(
     options.classesToPreserve || [],
   );
   this._keepClasses = !!options.keepClasses;
   this._serializer =
     options.serializer ||
     function (el) {
       return el.innerHTML;
     };
   this._disableJSONLD = !!options.disableJSONLD;
 
   // Start with all flags set
   this._flags =
     this.FLAG_STRIP_UNLIKELYS |
     this.FLAG_WEIGHT_CLASSES |
     this.FLAG_CLEAN_CONDITIONALLY;
 
   // Control whether log messages are sent to the console
   if (this._debug) {
     let logNode = function (node) {
       if (node.nodeType == node.TEXT_NODE) {
         return `${node.nodeName} ("${node.textContent}")`;
       }
       let attrPairs = Array.from(node.attributes || [], function (attr) {
         return `${attr.name}="${attr.value}"`;
       }).join(" ");
       return `<${node.localName} ${attrPairs}>`;
     };
     this.log = function () {
       if (typeof dump !== "undefined") {
         var msg = Array.prototype.map
           .call(arguments, function (x) {
             return x && x.nodeName ? logNode(x) : x;
           })
           .join(" ");
         dump("Reader: (Readability) " + msg + "\n");
       } else if (typeof console !== "undefined") {
         let args = Array.from(arguments, (arg) => {
           if (arg && arg.nodeType == this.ELEMENT_NODE) {
             return logNode(arg);
           }
           return arg;
         });
         args.unshift("Reader: (Readability)");
         console.log.apply(console, args);
       }
     };
   } else {
     this.log = function () {};
   }
 }
 
 Readability.prototype = {
   FLAG_STRIP_UNLIKELYS: 0x1,
   FLAG_WEIGHT_CLASSES: 0x2,
   FLAG_CLEAN_CONDITIONALLY: 0x4,
 
   // https://developer.mozilla.org/en-US/docs/Web/API/Node/nodeType
   ELEMENT_NODE: 1,
   TEXT_NODE: 3,
 
   // Max number of nodes supported by this parser. Default: 0 (no limit)
   DEFAULT_MAX_ELEMS_TO_PARSE: 0,
 
   // The number of top candidates to consider when analysing how
   // tight the competition is among candidates.
   DEFAULT_N_TOP_CANDIDATES: 5,
 
   // Element tags to score by default.
   DEFAULT_TAGS_TO_SCORE: "section,h2,h3,h4,h5,h6,p,td,pre"
     .toUpperCase()
     .split(","),
 
   // The default number of chars an article must have in order to return a result
   DEFAULT_CHAR_THRESHOLD: 500,
 
   // All of the regular expressions in use within readability.
   // Defined up here so we don't instantiate them repeatedly in loops.
   REGEXPS: {
     // NOTE: These two regular expressions are duplicated in
     // Readability-readerable.js. Please keep both copies in sync.
     unlikelyCandidates:
       /-ad-|ai2html|banner|breadcrumbs|combx|comment|community|cover-wrap|disqus|extra|footer|gdpr|header|legends|menu|related|remark|replies|rss|shoutbox|sidebar|skyscraper|social|sponsor|supplemental|ad-break|agegate|pagination|pager|popup|yom-remote/i,
     okMaybeItsACandidate: /and|article|body|column|content|main|shadow/i,
 
     positive:
       /article|body|content|entry|hentry|h-entry|main|page|pagination|post|text|blog|story/i,
     negative:
       /-ad-|hidden|^hid$| hid$| hid |^hid |banner|combx|comment|com-|contact|foot|footer|footnote|gdpr|masthead|media|meta|outbrain|promo|related|scroll|share|shoutbox|sidebar|skyscraper|sponsor|shopping|tags|tool|widget/i,
     extraneous:
       /print|archive|comment|discuss|e[\-]?mail|share|reply|all|login|sign|single|utility/i,
     byline: /byline|author|dateline|writtenby|p-author/i,
     replaceFonts: /<(\/?)font[^>]*>/gi,
     normalize: /\s{2,}/g,
     videos:
       /\/\/(www\.)?((dailymotion|youtube|youtube-nocookie|player\.vimeo|v\.qq)\.com|(archive|upload\.wikimedia)\.org|player\.twitch\.tv)/i,
     shareElements: /(\b|_)(share|sharedaddy)(\b|_)/i,
     nextLink: /(next|weiter|continue|>([^\|]|$)|»([^\|]|$))/i,
     prevLink: /(prev|earl|old|new|<|«)/i,
     tokenize: /\W+/g,
     whitespace: /^\s*$/,
     hasContent: /\S$/,
     hashUrl: /^#.+/,
     srcsetUrl: /(\S+)(\s+[\d.]+[xw])?(\s*(?:,|$))/g,
     b64DataUrl: /^data:\s*([^\s;,]+)\s*;\s*base64\s*,/i,
     // See: https://schema.org/Article
     jsonLdArticleTypes:
       /^Article|AdvertiserContentArticle|NewsArticle|AnalysisNewsArticle|AskPublicNewsArticle|BackgroundNewsArticle|OpinionNewsArticle|ReportageNewsArticle|ReviewNewsArticle|Report|SatiricalArticle|ScholarlyArticle|MedicalScholarlyArticle|SocialMediaPosting|BlogPosting|LiveBlogPosting|DiscussionForumPosting|TechArticle|APIReference$/,
   },
 
   UNLIKELY_ROLES: [
     "menu",
     "menubar",
     "complementary",
     "navigation",
     "alert",
     "alertdialog",
     "dialog",
   ],
 
   DIV_TO_P_ELEMS: new Set([
     "BLOCKQUOTE",
     "DL",
     "DIV",
     "IMG",
     "OL",
     "P",
     "PRE",
     "TABLE",
     "UL",
   ]),
 
   ALTER_TO_DIV_EXCEPTIONS: ["DIV", "ARTICLE", "SECTION", "P"],
 
   PRESENTATIONAL_ATTRIBUTES: [
     "align",
     "background",
     "bgcolor",
     "border",
     "cellpadding",
     "cellspacing",
     "frame",
     "hspace",
     "rules",
     "style",
     "valign",
     "vspace",
   ],
 
   DEPRECATED_SIZE_ATTRIBUTE_ELEMS: ["TABLE", "TH", "TD", "HR", "PRE"],
 
   // The commented out elements qualify as phrasing content but tend to be
   // removed by readability when put into paragraphs, so we ignore them here.
   PHRASING_ELEMS: [
     // "CANVAS", "IFRAME", "SVG", "VIDEO",
     "ABBR",
     "AUDIO",
     "B",
     "BDO",
     "BR",
     "BUTTON",
     "CITE",
     "CODE",
     "DATA",
     "DATALIST",
     "DFN",
     "EM",
     "EMBED",
     "I",
     "IMG",
     "INPUT",
     "KBD",
     "LABEL",
     "MARK",
     "MATH",
     "METER",
     "NOSCRIPT",
     "OBJECT",
     "OUTPUT",
     "PROGRESS",
     "Q",
     "RUBY",
     "SAMP",
     "SCRIPT",
     "SELECT",
     "SMALL",
     "SPAN",
     "STRONG",
     "SUB",
     "SUP",
     "TEXTAREA",
     "TIME",
     "VAR",
     "WBR",
   ],
 
   // These are the classes that readability sets itself.
   CLASSES_TO_PRESERVE: ["page"],
 
   // These are the list of HTML entities that need to be escaped.
   HTML_ESCAPE_MAP: {
     lt: "<",
     gt: ">",
     amp: "&",
     quot: '"',
     apos: "'",
   },
 
   /**
    * Run any post-process modifications to article content as necessary.
    *
    * @param Element
    * @return void
    **/
   _postProcessContent: function (articleContent) {
     // Readability cannot open relative uris so we convert them to absolute uris.
     this._fixRelativeUris(articleContent);
 
     this._simplifyNestedElements(articleContent);
 
     if (!this._keepClasses) {
       // Remove classes.
       this._cleanClasses(articleContent);
     }
   },
 
   /**
    * Iterates over a NodeList, calls `filterFn` for each node and removes node
    * if function returned `true`.
    *
    * If function is not passed, removes all the nodes in node list.
    *
    * @param NodeList nodeList The nodes to operate on
    * @param Function filterFn the function to use as a filter
    * @return void
    */
   _removeNodes: function (nodeList, filterFn) {
     // Avoid ever operating on live node lists.
     if (this._docJSDOMParser && nodeList._isLiveNodeList) {
       throw new Error("Do not pass live node lists to _removeNodes");
     }
     for (var i = nodeList.length - 1; i >= 0; i--) {
       var node = nodeList[i];
       var parentNode = node.parentNode;
       if (parentNode) {
         if (!filterFn || filterFn.call(this, node, i, nodeList)) {
           parentNode.removeChild(node);
         }
       }
     }
   },
 
   /**
    * Iterates over a NodeList, and calls _setNodeTag for each node.
    *
    * @param NodeList nodeList The nodes to operate on
    * @param String newTagName the new tag name to use
    * @return void
    */
   _replaceNodeTags: function (nodeList, newTagName) {
     // Avoid ever operating on live node lists.
     if (this._docJSDOMParser && nodeList._isLiveNodeList) {
       throw new Error("Do not pass live node lists to _replaceNodeTags");
     }
     for (const node of nodeList) {
       this._setNodeTag(node, newTagName);
     }
   },
 
   /**
    * Iterate over a NodeList, which doesn't natively fully implement the Array
    * interface.
    *
    * For convenience, the current object context is applied to the provided
    * iterate function.
    *
    * @param  NodeList nodeList The NodeList.
    * @param  Function fn       The iterate function.
    * @return void
    */
   _forEachNode: function (nodeList, fn) {
     Array.prototype.forEach.call(nodeList, fn, this);
   },
 
   /**
    * Iterate over a NodeList, and return the first node that passes
    * the supplied test function
    *
    * For convenience, the current object context is applied to the provided
    * test function.
    *
    * @param  NodeList nodeList The NodeList.
    * @param  Function fn       The test function.
    * @return void
    */
   _findNode: function (nodeList, fn) {
     return Array.prototype.find.call(nodeList, fn, this);
   },
 
   /**
    * Iterate over a NodeList, return true if any of the provided iterate
    * function calls returns true, false otherwise.
    *
    * For convenience, the current object context is applied to the
    * provided iterate function.
    *
    * @param  NodeList nodeList The NodeList.
    * @param  Function fn       The iterate function.
    * @return Boolean
    */
   _someNode: function (nodeList, fn) {
     return Array.prototype.some.call(nodeList, fn, this);
   },
 
   /**
    * Iterate over a NodeList, return true if all of the provided iterate
    * function calls return true, false otherwise.
    *
    * For convenience, the current object context is applied to the
    * provided iterate function.
    *
    * @param  NodeList nodeList The NodeList.
    * @param  Function fn       The iterate function.
    * @return Boolean
    */
   _everyNode: function (nodeList, fn) {
     return Array.prototype.every.call(nodeList, fn, this);
   },
 
   /**
    * Concat all nodelists passed as arguments.
    *
    * @return ...NodeList
    * @return Array
    */
   _concatNodeLists: function () {
     var slice = Array.prototype.slice;
     var args = slice.call(arguments);
     var nodeLists = args.map(function (list) {
       return slice.call(list);
     });
     return Array.prototype.concat.apply([], nodeLists);
   },
 
   _getAllNodesWithTag: function (node, tagNames) {
     if (node.querySelectorAll) {
       return node.querySelectorAll(tagNames.join(","));
     }
     return [].concat.apply(
       [],
       tagNames.map(function (tag) {
         var collection = node.getElementsByTagName(tag);
         return Array.isArray(collection) ? collection : Array.from(collection);
       }),
     );
   },
 
   /**
    * Removes the class="" attribute from every element in the given
    * subtree, except those that match CLASSES_TO_PRESERVE and
    * the classesToPreserve array from the options object.
    *
    * @param Element
    * @return void
    */
   _cleanClasses: function (node) {
     var classesToPreserve = this._classesToPreserve;
     var className = (node.getAttribute("class") || "")
       .split(/\s+/)
       .filter(function (cls) {
         return classesToPreserve.indexOf(cls) != -1;
       })
       .join(" ");
 
     if (className) {
       node.setAttribute("class", className);
     } else {
       node.removeAttribute("class");
     }
 
     for (node = node.firstElementChild; node; node = node.nextElementSibling) {
       this._cleanClasses(node);
     }
   },
 
   /**
    * Converts each <a> and <img> uri in the given element to an absolute URI,
    * ignoring #ref URIs.
    *
    * @param Element
    * @return void
    */
   _fixRelativeUris: function (articleContent) {
     var baseURI = this._doc.baseURI;
     var documentURI = this._doc.documentURI;
     function toAbsoluteURI(uri) {
       // Leave hash links alone if the base URI matches the document URI:
       if (baseURI == documentURI && uri.charAt(0) == "#") {
         return uri;
       }
 
       // Otherwise, resolve against base URI:
       try {
         return new URL(uri, baseURI).href;
       } catch (ex) {
         // Something went wrong, just return the original:
       }
       return uri;
     }
 
     var links = this._getAllNodesWithTag(articleContent, ["a"]);
     this._forEachNode(links, function (link) {
       var href = link.getAttribute("href");
       if (href) {
         // Remove links with javascript: URIs, since
         // they won't work after scripts have been removed from the page.
         if (href.indexOf("javascript:") === 0) {
           // if the link only contains simple text content, it can be converted to a text node
           if (
             link.childNodes.length === 1 &&
             link.childNodes[0].nodeType === this.TEXT_NODE
           ) {
             var text = this._doc.createTextNode(link.textContent);
             link.parentNode.replaceChild(text, link);
           } else {
             // if the link has multiple children, they should all be preserved
             var container = this._doc.createElement("span");
             while (link.firstChild) {
               container.appendChild(link.firstChild);
             }
             link.parentNode.replaceChild(container, link);
           }
         } else {
           link.setAttribute("href", toAbsoluteURI(href));
         }
       }
     });
 
     var medias = this._getAllNodesWithTag(articleContent, [
       "img",
       "picture",
       "figure",
       "video",
       "audio",
       "source",
     ]);
 
     this._forEachNode(medias, function (media) {
       var src = media.getAttribute("src");
       var poster = media.getAttribute("poster");
       var srcset = media.getAttribute("srcset");
 
       if (src) {
         media.setAttribute("src", toAbsoluteURI(src));
       }
 
       if (poster) {
         media.setAttribute("poster", toAbsoluteURI(poster));
       }
 
       if (srcset) {
         var newSrcset = srcset.replace(
           this.REGEXPS.srcsetUrl,
           function (_, p1, p2, p3) {
             return toAbsoluteURI(p1) + (p2 || "") + p3;
           },
         );
 
         media.setAttribute("srcset", newSrcset);
       }
     });
   },
 
   _simplifyNestedElements: function (articleContent) {
     var node = articleContent;
 
     while (node) {
       if (
         node.parentNode &&
         ["DIV", "SECTION"].includes(node.tagName) &&
         !(node.id && node.id.startsWith("readability"))
       ) {
         if (this._isElementWithoutContent(node)) {
           node = this._removeAndGetNext(node);
           continue;
         } else if (
           this._hasSingleTagInsideElement(node, "DIV") ||
           this._hasSingleTagInsideElement(node, "SECTION")
         ) {
           var child = node.children[0];
           for (var i = 0; i < node.attributes.length; i++) {
             child.setAttribute(
               node.attributes[i].name,
               node.attributes[i].value,
             );
           }
           node.parentNode.replaceChild(child, node);
           node = child;
           continue;
         }
       }
 
       node = this._getNextNode(node);
     }
   },
 
   /**
    * Get the article title as an H1.
    *
    * @return string
    **/
   _getArticleTitle: function () {
     var doc = this._doc;
     var curTitle = "";
     var origTitle = "";
 
     try {
       curTitle = origTitle = doc.title.trim();
 
       // If they had an element with id "title" in their HTML
       if (typeof curTitle !== "string")
         curTitle = origTitle = this._getInnerText(
           doc.getElementsByTagName("title")[0],
         );
     } catch (e) {
       /* ignore exceptions setting the title. */
     }
 
     var titleHadHierarchicalSeparators = false;
     function wordCount(str) {
       return str.split(/\s+/).length;
     }
 
     // If there's a separator in the title, first remove the final part
     if (/ [\|\-\\\/>»] /.test(curTitle)) {
       titleHadHierarchicalSeparators = / [\\\/>»] /.test(curTitle);
       curTitle = origTitle.replace(/(.*)[\|\-\\\/>»] .*/gi, "$1");
 
       // If the resulting title is too short (3 words or fewer), remove
       // the first part instead:
       if (wordCount(curTitle) < 3)
         curTitle = origTitle.replace(/[^\|\-\\\/>»]*[\|\-\\\/>»](.*)/gi, "$1");
     } else if (curTitle.indexOf(": ") !== -1) {
       // Check if we have an heading containing this exact string, so we
       // could assume it's the full title.
       var headings = this._concatNodeLists(
         doc.getElementsByTagName("h1"),
         doc.getElementsByTagName("h2"),
       );
       var trimmedTitle = curTitle.trim();
       var match = this._someNode(headings, function (heading) {
         return heading.textContent.trim() === trimmedTitle;
       });
 
       // If we don't, let's extract the title out of the original title string.
       if (!match) {
         curTitle = origTitle.substring(origTitle.lastIndexOf(":") + 1);
 
         // If the title is now too short, try the first colon instead:
         if (wordCount(curTitle) < 3) {
           curTitle = origTitle.substring(origTitle.indexOf(":") + 1);
           // But if we have too many words before the colon there's something weird
           // with the titles and the H tags so let's just use the original title instead
         } else if (wordCount(origTitle.substr(0, origTitle.indexOf(":"))) > 5) {
           curTitle = origTitle;
         }
       }
     } else if (curTitle.length > 150 || curTitle.length < 15) {
       var hOnes = doc.getElementsByTagName("h1");
 
       if (hOnes.length === 1) curTitle = this._getInnerText(hOnes[0]);
     }
 
     curTitle = curTitle.trim().replace(this.REGEXPS.normalize, " ");
     // If we now have 4 words or fewer as our title, and either no
     // 'hierarchical' separators (\, /, > or ») were found in the original
     // title or we decreased the number of words by more than 1 word, use
     // the original title.
     var curTitleWordCount = wordCount(curTitle);
     if (
       curTitleWordCount <= 4 &&
       (!titleHadHierarchicalSeparators ||
         curTitleWordCount !=
           wordCount(origTitle.replace(/[\|\-\\\/>»]+/g, "")) - 1)
     ) {
       curTitle = origTitle;
     }
 
     return curTitle;
   },
 
   /**
    * Prepare the HTML document for readability to scrape it.
    * This includes things like stripping javascript, CSS, and handling terrible markup.
    *
    * @return void
    **/
   _prepDocument: function () {
     var doc = this._doc;
 
     // Remove all style tags in head
     this._removeNodes(this._getAllNodesWithTag(doc, ["style"]));
 
     if (doc.body) {
       this._replaceBrs(doc.body);
     }
 
     this._replaceNodeTags(this._getAllNodesWithTag(doc, ["font"]), "SPAN");
   },
 
   /**
    * Finds the next node, starting from the given node, and ignoring
    * whitespace in between. If the given node is an element, the same node is
    * returned.
    */
   _nextNode: function (node) {
     var next = node;
     while (
       next &&
       next.nodeType != this.ELEMENT_NODE &&
       this.REGEXPS.whitespace.test(next.textContent)
     ) {
       next = next.nextSibling;
     }
     return next;
   },
 
   /**
    * Replaces 2 or more successive <br> elements with a single <p>.
    * Whitespace between <br> elements are ignored. For example:
    *   <div>foo<br>bar<br> <br><br>abc</div>
    * will become:
    *   <div>foo<br>bar<p>abc</p></div>
    */
   _replaceBrs: function (elem) {
     this._forEachNode(this._getAllNodesWithTag(elem, ["br"]), function (br) {
       var next = br.nextSibling;
 
       // Whether 2 or more <br> elements have been found and replaced with a
       // <p> block.
       var replaced = false;
 
       // If we find a <br> chain, remove the <br>s until we hit another node
       // or non-whitespace. This leaves behind the first <br> in the chain
       // (which will be replaced with a <p> later).
       while ((next = this._nextNode(next)) && next.tagName == "BR") {
         replaced = true;
         var brSibling = next.nextSibling;
         next.parentNode.removeChild(next);
         next = brSibling;
       }
 
       // If we removed a <br> chain, replace the remaining <br> with a <p>. Add
       // all sibling nodes as children of the <p> until we hit another <br>
       // chain.
       if (replaced) {
         var p = this._doc.createElement("p");
         br.parentNode.replaceChild(p, br);
 
         next = p.nextSibling;
         while (next) {
           // If we've hit another <br><br>, we're done adding children to this <p>.
           if (next.tagName == "BR") {
             var nextElem = this._nextNode(next.nextSibling);
             if (nextElem && nextElem.tagName == "BR") break;
           }
 
           if (!this._isPhrasingContent(next)) break;
 
           // Otherwise, make this node a child of the new <p>.
           var sibling = next.nextSibling;
           p.appendChild(next);
           next = sibling;
         }
 
         while (p.lastChild && this._isWhitespace(p.lastChild)) {
           p.removeChild(p.lastChild);
         }
 
         if (p.parentNode.tagName === "P") this._setNodeTag(p.parentNode, "DIV");
       }
     });
   },
 
   _setNodeTag: function (node, tag) {
     this.log("_setNodeTag", node, tag);
     if (this._docJSDOMParser) {
       node.localName = tag.toLowerCase();
       node.tagName = tag.toUpperCase();
       return node;
     }
 
     var replacement = node.ownerDocument.createElement(tag);
     while (node.firstChild) {
       replacement.appendChild(node.firstChild);
     }
     node.parentNode.replaceChild(replacement, node);
     if (node.readability) replacement.readability = node.readability;
 
     for (var i = 0; i < node.attributes.length; i++) {
       try {
         replacement.setAttribute(
           node.attributes[i].name,
           node.attributes[i].value,
         );
       } catch (ex) {
         /* it's possible for setAttribute() to throw if the attribute name
          * isn't a valid XML Name. Such attributes can however be parsed from
          * source in HTML docs, see https://github.com/whatwg/html/issues/4275,
          * so we can hit them here and then throw. We don't care about such
          * attributes so we ignore them.
          */
       }
     }
     return replacement;
   },
 
   /**
    * Prepare the article node for display. Clean out any inline styles,
    * iframes, forms, strip extraneous <p> tags, etc.
    *
    * @param Element
    * @return void
    **/
   _prepArticle: function (articleContent) {
     this._cleanStyles(articleContent);
 
     // Check for data tables before we continue, to avoid removing items in
     // those tables, which will often be isolated even though they're
     // visually linked to other content-ful elements (text, images, etc.).
     this._markDataTables(articleContent);
 
     this._fixLazyImages(articleContent);
 
     // Clean out junk from the article content
     this._cleanConditionally(articleContent, "form");
     this._cleanConditionally(articleContent, "fieldset");
     this._clean(articleContent, "object");
     this._clean(articleContent, "embed");
     this._clean(articleContent, "footer");
     this._clean(articleContent, "link");
     this._clean(articleContent, "aside");
 
     // Clean out elements with little content that have "share" in their id/class combinations from final top candidates,
     // which means we don't remove the top candidates even they have "share".
 
     var shareElementThreshold = this.DEFAULT_CHAR_THRESHOLD;
 
     this._forEachNode(articleContent.children, function (topCandidate) {
       this._cleanMatchedNodes(topCandidate, function (node, matchString) {
         return (
           this.REGEXPS.shareElements.test(matchString) &&
           node.textContent.length < shareElementThreshold
         );
       });
     });
 
     this._clean(articleContent, "iframe");
     this._clean(articleContent, "input");
     this._clean(articleContent, "textarea");
     this._clean(articleContent, "select");
     this._clean(articleContent, "button");
     this._cleanHeaders(articleContent);
 
     // Do these last as the previous stuff may have removed junk
     // that will affect these
     this._cleanConditionally(articleContent, "table");
     this._cleanConditionally(articleContent, "ul");
     this._cleanConditionally(articleContent, "div");
 
     // replace H1 with H2 as H1 should be only title that is displayed separately
     this._replaceNodeTags(
       this._getAllNodesWithTag(articleContent, ["h1"]),
       "h2",
     );
 
     // Remove extra paragraphs
     this._removeNodes(
       this._getAllNodesWithTag(articleContent, ["p"]),
       function (paragraph) {
         var imgCount = paragraph.getElementsByTagName("img").length;
         var embedCount = paragraph.getElementsByTagName("embed").length;
         var objectCount = paragraph.getElementsByTagName("object").length;
         // At this point, nasty iframes have been removed, only remain embedded video ones.
         var iframeCount = paragraph.getElementsByTagName("iframe").length;
         var totalCount = imgCount + embedCount + objectCount + iframeCount;
 
         return totalCount === 0 && !this._getInnerText(paragraph, false);
       },
     );
 
     this._forEachNode(
       this._getAllNodesWithTag(articleContent, ["br"]),
       function (br) {
         var next = this._nextNode(br.nextSibling);
         if (next && next.tagName == "P") br.parentNode.removeChild(br);
       },
     );
 
     // Remove single-cell tables
     this._forEachNode(
       this._getAllNodesWithTag(articleContent, ["table"]),
       function (table) {
         var tbody = this._hasSingleTagInsideElement(table, "TBODY")
           ? table.firstElementChild
           : table;
         if (this._hasSingleTagInsideElement(tbody, "TR")) {
           var row = tbody.firstElementChild;
           if (this._hasSingleTagInsideElement(row, "TD")) {
             var cell = row.firstElementChild;
             cell = this._setNodeTag(
               cell,
               this._everyNode(cell.childNodes, this._isPhrasingContent)
                 ? "P"
                 : "DIV",
             );
             table.parentNode.replaceChild(cell, table);
           }
         }
       },
     );
   },
 
   /**
    * Initialize a node with the readability object. Also checks the
    * className/id for special names to add to its score.
    *
    * @param Element
    * @return void
    **/
   _initializeNode: function (node) {
     node.readability = { contentScore: 0 };
 
     switch (node.tagName) {
       case "DIV":
         node.readability.contentScore += 5;
         break;
 
       case "PRE":
       case "TD":
       case "BLOCKQUOTE":
         node.readability.contentScore += 3;
         break;
 
       case "ADDRESS":
       case "OL":
       case "UL":
       case "DL":
       case "DD":
       case "DT":
       case "LI":
       case "FORM":
         node.readability.contentScore -= 3;
         break;
 
       case "H1":
       case "H2":
       case "H3":
       case "H4":
       case "H5":
       case "H6":
       case "TH":
         node.readability.contentScore -= 5;
         break;
     }
 
     node.readability.contentScore += this._getClassWeight(node);
   },
 
   _removeAndGetNext: function (node) {
     var nextNode = this._getNextNode(node, true);
     node.parentNode.removeChild(node);
     return nextNode;
   },
 
   /**
    * Traverse the DOM from node to node, starting at the node passed in.
    * Pass true for the second parameter to indicate this node itself
    * (and its kids) are going away, and we want the next node over.
    *
    * Calling this in a loop will traverse the DOM depth-first.
    */
   _getNextNode: function (node, ignoreSelfAndKids) {
     // First check for kids if those aren't being ignored
     if (!ignoreSelfAndKids && node.firstElementChild) {
       return node.firstElementChild;
     }
     // Then for siblings...
     if (node.nextElementSibling) {
       return node.nextElementSibling;
     }
     // And finally, move up the parent chain *and* find a sibling
     // (because this is depth-first traversal, we will have already
     // seen the parent nodes themselves).
     do {
       node = node.parentNode;
     } while (node && !node.nextElementSibling);
     return node && node.nextElementSibling;
   },
 
   // compares second text to first one
   // 1 = same text, 0 = completely different text
   // works the way that it splits both texts into words and then finds words that are unique in second text
   // the result is given by the lower length of unique parts
   _textSimilarity: function (textA, textB) {
     var tokensA = textA
       .toLowerCase()
       .split(this.REGEXPS.tokenize)
       .filter(Boolean);
     var tokensB = textB
       .toLowerCase()
       .split(this.REGEXPS.tokenize)
       .filter(Boolean);
     if (!tokensA.length || !tokensB.length) {
       return 0;
     }
     var uniqTokensB = tokensB.filter((token) => !tokensA.includes(token));
     var distanceB = uniqTokensB.join(" ").length / tokensB.join(" ").length;
     return 1 - distanceB;
   },
 
   _checkByline: function (node, matchString) {
     if (this._articleByline) {
       return false;
     }
 
     if (node.getAttribute !== undefined) {
       var rel = node.getAttribute("rel");
       var itemprop = node.getAttribute("itemprop");
     }
 
     if (
       (rel === "author" ||
         (itemprop && itemprop.indexOf("author") !== -1) ||
         this.REGEXPS.byline.test(matchString)) &&
       this._isValidByline(node.textContent)
     ) {
       this._articleByline = node.textContent.trim();
       return true;
     }
 
     return false;
   },
 
   _getNodeAncestors: function (node, maxDepth) {
     maxDepth = maxDepth || 0;
     var i = 0,
       ancestors = [];
     while (node.parentNode) {
       ancestors.push(node.parentNode);
       if (maxDepth && ++i === maxDepth) break;
       node = node.parentNode;
     }
     return ancestors;
   },
 
   /***
    * grabArticle - Using a variety of metrics (content score, classname, element types), find the content that is
    *         most likely to be the stuff a user wants to read. Then return it wrapped up in a div.
    *
    * @param page a document to run upon. Needs to be a full document, complete with body.
    * @return Element
    **/
   _grabArticle: function (page) {
     this.log("**** grabArticle ****");
     var doc = this._doc;
     var isPaging = page !== null;
     page = page ? page : this._doc.body;
 
     // We can't grab an article if we don't have a page!
     if (!page) {
       this.log("No body found in document. Abort.");
       return null;
     }
 
     var pageCacheHtml = page.innerHTML;
 
     while (true) {
       this.log("Starting grabArticle loop");
       var stripUnlikelyCandidates = this._flagIsActive(
         this.FLAG_STRIP_UNLIKELYS,
       );
 
       // First, node prepping. Trash nodes that look cruddy (like ones with the
       // class name "comment", etc), and turn divs into P tags where they have been
       // used inappropriately (as in, where they contain no other block level elements.)
       var elementsToScore = [];
       var node = this._doc.documentElement;
 
       let shouldRemoveTitleHeader = true;
 
       while (node) {
         if (node.tagName === "HTML") {
           this._articleLang = node.getAttribute("lang");
         }
 
         var matchString = node.className + " " + node.id;
 
         if (!this._isProbablyVisible(node)) {
           this.log("Removing hidden node - " + matchString);
           node = this._removeAndGetNext(node);
           continue;
         }
 
         // Check to see if this node is a byline, and remove it if it is.
         if (this._checkByline(node, matchString)) {
           node = this._removeAndGetNext(node);
           continue;
         }
 
         if (shouldRemoveTitleHeader && this._headerDuplicatesTitle(node)) {
           this.log(
             "Removing header: ",
             node.textContent.trim(),
             this._articleTitle.trim(),
           );
           shouldRemoveTitleHeader = false;
           node = this._removeAndGetNext(node);
           continue;
         }
 
         // Remove unlikely candidates
         if (stripUnlikelyCandidates) {
           if (
             this.REGEXPS.unlikelyCandidates.test(matchString) &&
             !this.REGEXPS.okMaybeItsACandidate.test(matchString) &&
             !this._hasAncestorTag(node, "table") &&
             !this._hasAncestorTag(node, "code") &&
             node.tagName !== "BODY" &&
             node.tagName !== "A"
           ) {
             this.log("Removing unlikely candidate - " + matchString);
             node = this._removeAndGetNext(node);
             continue;
           }
 
           if (this.UNLIKELY_ROLES.includes(node.getAttribute("role"))) {
             this.log(
               "Removing content with role " +
                 node.getAttribute("role") +
                 " - " +
                 matchString,
             );
             node = this._removeAndGetNext(node);
             continue;
           }
         }
 
         // Remove DIV, SECTION, and HEADER nodes without any content(e.g. text, image, video, or iframe).
         if (
           (node.tagName === "DIV" ||
             node.tagName === "SECTION" ||
             node.tagName === "HEADER" ||
             node.tagName === "H1" ||
             node.tagName === "H2" ||
             node.tagName === "H3" ||
             node.tagName === "H4" ||
             node.tagName === "H5" ||
             node.tagName === "H6") &&
           this._isElementWithoutContent(node)
         ) {
           node = this._removeAndGetNext(node);
           continue;
         }
 
         if (this.DEFAULT_TAGS_TO_SCORE.indexOf(node.tagName) !== -1) {
           elementsToScore.push(node);
         }
 
         // Turn all divs that don't have children block level elements into p's
         if (node.tagName === "DIV") {
           // Put phrasing content into paragraphs.
           var p = null;
           var childNode = node.firstChild;
           while (childNode) {
             var nextSibling = childNode.nextSibling;
             if (this._isPhrasingContent(childNode)) {
               if (p !== null) {
                 p.appendChild(childNode);
               } else if (!this._isWhitespace(childNode)) {
                 p = doc.createElement("p");
                 node.replaceChild(p, childNode);
                 p.appendChild(childNode);
               }
             } else if (p !== null) {
               while (p.lastChild && this._isWhitespace(p.lastChild)) {
                 p.removeChild(p.lastChild);
               }
               p = null;
             }
             childNode = nextSibling;
           }
 
           // Sites like http://mobile.slate.com encloses each paragraph with a DIV
           // element. DIVs with only a P element inside and no text content can be
           // safely converted into plain P elements to avoid confusing the scoring
           // algorithm with DIVs with are, in practice, paragraphs.
           if (
             this._hasSingleTagInsideElement(node, "P") &&
             this._getLinkDensity(node) < 0.25
           ) {
             var newNode = node.children[0];
             node.parentNode.replaceChild(newNode, node);
             node = newNode;
             elementsToScore.push(node);
           } else if (!this._hasChildBlockElement(node)) {
             node = this._setNodeTag(node, "P");
             elementsToScore.push(node);
           }
         }
         node = this._getNextNode(node);
       }
 
       /**
        * Loop through all paragraphs, and assign a score to them based on how content-y they look.
        * Then add their score to their parent node.
        *
        * A score is determined by things like number of commas, class names, etc. Maybe eventually link density.
        **/
       var candidates = [];
       this._forEachNode(elementsToScore, function (elementToScore) {
         if (
           !elementToScore.parentNode ||
           typeof elementToScore.parentNode.tagName === "undefined"
         )
           return;
 
         // If this paragraph is less than 25 characters, don't even count it.
         var innerText = this._getInnerText(elementToScore);
         if (innerText.length < 25) return;
 
         // Exclude nodes with no ancestor.
         var ancestors = this._getNodeAncestors(elementToScore, 5);
         if (ancestors.length === 0) return;
 
         var contentScore = 0;
 
         // Add a point for the paragraph itself as a base.
         contentScore += 1;
 
         // Add points for any commas within this paragraph.
         contentScore += innerText.split(",").length;
 
         // For every 100 characters in this paragraph, add another point. Up to 3 points.
         contentScore += Math.min(Math.floor(innerText.length / 100), 3);
 
         // Initialize and score ancestors.
         this._forEachNode(ancestors, function (ancestor, level) {
           if (
             !ancestor.tagName ||
             !ancestor.parentNode ||
             typeof ancestor.parentNode.tagName === "undefined"
           )
             return;
 
           if (typeof ancestor.readability === "undefined") {
             this._initializeNode(ancestor);
             candidates.push(ancestor);
           }
 
           // Node score divider:
           // - parent:             1 (no division)
           // - grandparent:        2
           // - great grandparent+: ancestor level * 3
           if (level === 0) var scoreDivider = 1;
           else if (level === 1) scoreDivider = 2;
           else scoreDivider = level * 3;
           ancestor.readability.contentScore += contentScore / scoreDivider;
         });
       });
 
       // After we've calculated scores, loop through all of the possible
       // candidate nodes we found and find the one with the highest score.
       var topCandidates = [];
       for (var c = 0, cl = candidates.length; c < cl; c += 1) {
         var candidate = candidates[c];
 
         // Scale the final candidates score based on link density. Good content
         // should have a relatively small link density (5% or less) and be mostly
         // unaffected by this operation.
         var candidateScore =
           candidate.readability.contentScore *
           (1 - this._getLinkDensity(candidate));
         candidate.readability.contentScore = candidateScore;
 
         this.log("Candidate:", candidate, "with score " + candidateScore);
 
         for (var t = 0; t < this._nbTopCandidates; t++) {
           var aTopCandidate = topCandidates[t];
 
           if (
             !aTopCandidate ||
             candidateScore > aTopCandidate.readability.contentScore
           ) {
             topCandidates.splice(t, 0, candidate);
             if (topCandidates.length > this._nbTopCandidates)
               topCandidates.pop();
             break;
           }
         }
       }
 
       var topCandidate = topCandidates[0] || null;
       var neededToCreateTopCandidate = false;
       var parentOfTopCandidate;
 
       // If we still have no top candidate, just use the body as a last resort.
       // We also have to copy the body node so it is something we can modify.
       if (topCandidate === null || topCandidate.tagName === "BODY") {
         // Move all of the page's children into topCandidate
         topCandidate = doc.createElement("DIV");
         neededToCreateTopCandidate = true;
         // Move everything (not just elements, also text nodes etc.) into the container
         // so we even include text directly in the body:
         while (page.firstChild) {
           this.log("Moving child out:", page.firstChild);
           topCandidate.appendChild(page.firstChild);
         }
 
         page.appendChild(topCandidate);
 
         this._initializeNode(topCandidate);
       } else if (topCandidate) {
         // Find a better top candidate node if it contains (at least three) nodes which belong to `topCandidates` array
         // and whose scores are quite closed with current `topCandidate` node.
         var alternativeCandidateAncestors = [];
         for (var i = 1; i < topCandidates.length; i++) {
           if (
             topCandidates[i].readability.contentScore /
               topCandidate.readability.contentScore >=
             0.75
           ) {
             alternativeCandidateAncestors.push(
               this._getNodeAncestors(topCandidates[i]),
             );
           }
         }
         var MINIMUM_TOPCANDIDATES = 3;
         if (alternativeCandidateAncestors.length >= MINIMUM_TOPCANDIDATES) {
           parentOfTopCandidate = topCandidate.parentNode;
           while (parentOfTopCandidate.tagName !== "BODY") {
             var listsContainingThisAncestor = 0;
             for (
               var ancestorIndex = 0;
               ancestorIndex < alternativeCandidateAncestors.length &&
               listsContainingThisAncestor < MINIMUM_TOPCANDIDATES;
               ancestorIndex++
             ) {
               listsContainingThisAncestor += Number(
                 alternativeCandidateAncestors[ancestorIndex].includes(
                   parentOfTopCandidate,
                 ),
               );
             }
             if (listsContainingThisAncestor >= MINIMUM_TOPCANDIDATES) {
               topCandidate = parentOfTopCandidate;
               break;
             }
             parentOfTopCandidate = parentOfTopCandidate.parentNode;
           }
         }
         if (!topCandidate.readability) {
           this._initializeNode(topCandidate);
         }
 
         // Because of our bonus system, parents of candidates might have scores
         // themselves. They get half of the node. There won't be nodes with higher
         // scores than our topCandidate, but if we see the score going *up* in the first
         // few steps up the tree, that's a decent sign that there might be more content
         // lurking in other places that we want to unify in. The sibling stuff
         // below does some of that - but only if we've looked high enough up the DOM
         // tree.
         parentOfTopCandidate = topCandidate.parentNode;
         var lastScore = topCandidate.readability.contentScore;
         // The scores shouldn't get too low.
         var scoreThreshold = lastScore / 3;
         while (parentOfTopCandidate.tagName !== "BODY") {
           if (!parentOfTopCandidate.readability) {
             parentOfTopCandidate = parentOfTopCandidate.parentNode;
             continue;
           }
           var parentScore = parentOfTopCandidate.readability.contentScore;
           if (parentScore < scoreThreshold) break;
           if (parentScore > lastScore) {
             // Alright! We found a better parent to use.
             topCandidate = parentOfTopCandidate;
             break;
           }
           lastScore = parentOfTopCandidate.readability.contentScore;
           parentOfTopCandidate = parentOfTopCandidate.parentNode;
         }
 
         // If the top candidate is the only child, use parent instead. This will help sibling
         // joining logic when adjacent content is actually located in parent's sibling node.
         parentOfTopCandidate = topCandidate.parentNode;
         while (
           parentOfTopCandidate.tagName != "BODY" &&
           parentOfTopCandidate.children.length == 1
         ) {
           topCandidate = parentOfTopCandidate;
           parentOfTopCandidate = topCandidate.parentNode;
         }
         if (!topCandidate.readability) {
           this._initializeNode(topCandidate);
         }
       }
 
       // Now that we have the top candidate, look through its siblings for content
       // that might also be related. Things like preambles, content split by ads
       // that we removed, etc.
       var articleContent = doc.createElement("DIV");
       if (isPaging) articleContent.id = "readability-content";
 
       var siblingScoreThreshold = Math.max(
         10,
         topCandidate.readability.contentScore * 0.2,
       );
       // Keep potential top candidate's parent node to try to get text direction of it later.
       parentOfTopCandidate = topCandidate.parentNode;
       var siblings = parentOfTopCandidate.children;
 
       for (var s = 0, sl = siblings.length; s < sl; s++) {
         var sibling = siblings[s];
         var append = false;
 
         this.log(
           "Looking at sibling node:",
           sibling,
           sibling.readability
             ? "with score " + sibling.readability.contentScore
             : "",
         );
         this.log(
           "Sibling has score",
           sibling.readability ? sibling.readability.contentScore : "Unknown",
         );
 
         if (sibling === topCandidate) {
           append = true;
         } else {
           var contentBonus = 0;
 
           // Give a bonus if sibling nodes and top candidates have the example same classname
           if (
             sibling.className === topCandidate.className &&
             topCandidate.className !== ""
           )
             contentBonus += topCandidate.readability.contentScore * 0.2;
 
           if (
             sibling.readability &&
             sibling.readability.contentScore + contentBonus >=
               siblingScoreThreshold
           ) {
             append = true;
           } else if (sibling.nodeName === "P") {
             var linkDensity = this._getLinkDensity(sibling);
             var nodeContent = this._getInnerText(sibling);
             var nodeLength = nodeContent.length;
 
             if (nodeLength > 80 && linkDensity < 0.25) {
               append = true;
             } else if (
               nodeLength < 80 &&
               nodeLength > 0 &&
               linkDensity === 0 &&
               nodeContent.search(/\.( |$)/) !== -1
             ) {
               append = true;
             }
           }
         }
 
         if (append) {
           this.log("Appending node:", sibling);
 
           if (this.ALTER_TO_DIV_EXCEPTIONS.indexOf(sibling.nodeName) === -1) {
             // We have a node that isn't a common block level element, like a form or td tag.
             // Turn it into a div so it doesn't get filtered out later by accident.
             this.log("Altering sibling:", sibling, "to div.");
 
             sibling = this._setNodeTag(sibling, "DIV");
           }
 
           articleContent.appendChild(sibling);
           // Fetch children again to make it compatible
           // with DOM parsers without live collection support.
           siblings = parentOfTopCandidate.children;
           // siblings is a reference to the children array, and
           // sibling is removed from the array when we call appendChild().
           // As a result, we must revisit this index since the nodes
           // have been shifted.
           s -= 1;
           sl -= 1;
         }
       }
 
       if (this._debug)
         this.log("Article content pre-prep: " + articleContent.innerHTML);
       // So we have all of the content that we need. Now we clean it up for presentation.
       this._prepArticle(articleContent);
       if (this._debug)
         this.log("Article content post-prep: " + articleContent.innerHTML);
 
       if (neededToCreateTopCandidate) {
         // We already created a fake div thing, and there wouldn't have been any siblings left
         // for the previous loop, so there's no point trying to create a new div, and then
         // move all the children over. Just assign IDs and class names here. No need to append
         // because that already happened anyway.
         topCandidate.id = "readability-page-1";
         topCandidate.className = "page";
       } else {
         var div = doc.createElement("DIV");
         div.id = "readability-page-1";
         div.className = "page";
         while (articleContent.firstChild) {
           div.appendChild(articleContent.firstChild);
         }
         articleContent.appendChild(div);
       }
 
       if (this._debug)
         this.log("Article content after paging: " + articleContent.innerHTML);
 
       var parseSuccessful = true;
 
       // Now that we've gone through the full algorithm, check to see if
       // we got any meaningful content. If we didn't, we may need to re-run
       // grabArticle with different flags set. This gives us a higher likelihood of
       // finding the content, and the sieve approach gives us a higher likelihood of
       // finding the -right- content.
       var textLength = this._getInnerText(articleContent, true).length;
       if (textLength < this._charThreshold) {
         parseSuccessful = false;
         page.innerHTML = pageCacheHtml;
 
         if (this._flagIsActive(this.FLAG_STRIP_UNLIKELYS)) {
           this._removeFlag(this.FLAG_STRIP_UNLIKELYS);
           this._attempts.push({
             articleContent: articleContent,
             textLength: textLength,
           });
         } else if (this._flagIsActive(this.FLAG_WEIGHT_CLASSES)) {
           this._removeFlag(this.FLAG_WEIGHT_CLASSES);
           this._attempts.push({
             articleContent: articleContent,
             textLength: textLength,
           });
         } else if (this._flagIsActive(this.FLAG_CLEAN_CONDITIONALLY)) {
           this._removeFlag(this.FLAG_CLEAN_CONDITIONALLY);
           this._attempts.push({
             articleContent: articleContent,
             textLength: textLength,
           });
         } else {
           this._attempts.push({
             articleContent: articleContent,
             textLength: textLength,
           });
           // No luck after removing flags, just return the longest text we found during the different loops
           this._attempts.sort(function (a, b) {
             return b.textLength - a.textLength;
           });
 
           // But first check if we actually have something
           if (!this._attempts[0].textLength) {
             return null;
           }
 
           articleContent = this._attempts[0].articleContent;
           parseSuccessful = true;
         }
       }
 
       if (parseSuccessful) {
         // Find out text direction from ancestors of final top candidate.
         var ancestors = [parentOfTopCandidate, topCandidate].concat(
           this._getNodeAncestors(parentOfTopCandidate),
         );
         this._someNode(ancestors, function (ancestor) {
           if (!ancestor.tagName) return false;
           var articleDir = ancestor.getAttribute("dir");
           if (articleDir) {
             this._articleDir = articleDir;
             return true;
           }
           return false;
         });
         return articleContent;
       }
     }
   },
 
   /**
    * Check whether the input string could be a byline.
    * This verifies that the input is a string, and that the length
    * is less than 100 chars.
    *
    * @param possibleByline {string} - a string to check whether its a byline.
    * @return Boolean - whether the input string is a byline.
    */
   _isValidByline: function (byline) {
     if (typeof byline == "string" || byline instanceof String) {
       byline = byline.trim();
       return byline.length > 0 && byline.length < 100;
     }
     return false;
   },
 
   /**
    * Converts some of the common HTML entities in string to their corresponding characters.
    *
    * @param str {string} - a string to unescape.
    * @return string without HTML entity.
    */
   _unescapeHtmlEntities: function (str) {
     if (!str) {
       return str;
     }
 
     var htmlEscapeMap = this.HTML_ESCAPE_MAP;
     return str
       .replace(/&(quot|amp|apos|lt|gt);/g, function (_, tag) {
         return htmlEscapeMap[tag];
       })
       .replace(
         /&#(?:x([0-9a-z]{1,4})|([0-9]{1,4}));/gi,
         function (_, hex, numStr) {
           var num = parseInt(hex || numStr, hex ? 16 : 10);
           return String.fromCharCode(num);
         },
       );
   },
 
   /**
    * Try to extract metadata from JSON-LD object.
    * For now, only Schema.org objects of type Article or its subtypes are supported.
    * @return Object with any metadata that could be extracted (possibly none)
    */
   _getJSONLD: function (doc) {
     var scripts = this._getAllNodesWithTag(doc, ["script"]);
 
     var metadata;
 
     this._forEachNode(scripts, function (jsonLdElement) {
       if (
         !metadata &&
         jsonLdElement.getAttribute("type") === "application/ld+json"
       ) {
         try {
           // Strip CDATA markers if present
           var content = jsonLdElement.textContent.replace(
             /^\s*<!\[CDATA\[|\]\]>\s*$/g,
             "",
           );
           var parsed = JSON.parse(content);
           if (
             !parsed["@context"] ||
             !parsed["@context"].match(/^https?\:\/\/schema\.org$/)
           ) {
             return;
           }
 
           if (!parsed["@type"] && Array.isArray(parsed["@graph"])) {
             parsed = parsed["@graph"].find(function (it) {
               return (it["@type"] || "").match(this.REGEXPS.jsonLdArticleTypes);
             });
           }
 
           if (
             !parsed ||
             !parsed["@type"] ||
             !parsed["@type"].match(this.REGEXPS.jsonLdArticleTypes)
           ) {
             return;
           }
 
           metadata = {};
 
           if (
             typeof parsed.name === "string" &&
             typeof parsed.headline === "string" &&
             parsed.name !== parsed.headline
           ) {
             // we have both name and headline element in the JSON-LD. They should both be the same but some websites like aktualne.cz
             // put their own name into "name" and the article title to "headline" which confuses Readability. So we try to check if either
             // "name" or "headline" closely matches the html title, and if so, use that one. If not, then we use "name" by default.
 
             var title = this._getArticleTitle();
             var nameMatches = this._textSimilarity(parsed.name, title) > 0.75;
             var headlineMatches =
               this._textSimilarity(parsed.headline, title) > 0.75;
 
             if (headlineMatches && !nameMatches) {
               metadata.title = parsed.headline;
             } else {
               metadata.title = parsed.name;
             }
           } else if (typeof parsed.name === "string") {
             metadata.title = parsed.name.trim();
           } else if (typeof parsed.headline === "string") {
             metadata.title = parsed.headline.trim();
           }
           if (parsed.author) {
             if (typeof parsed.author.name === "string") {
               metadata.byline = parsed.author.name.trim();
             } else if (
               Array.isArray(parsed.author) &&
               parsed.author[0] &&
               typeof parsed.author[0].name === "string"
             ) {
               metadata.byline = parsed.author
                 .filter(function (author) {
                   return author && typeof author.name === "string";
                 })
                 .map(function (author) {
                   return author.name.trim();
                 })
                 .join(", ");
             }
           }
           if (typeof parsed.description === "string") {
             metadata.excerpt = parsed.description.trim();
           }
           if (parsed.publisher && typeof parsed.publisher.name === "string") {
             metadata.siteName = parsed.publisher.name.trim();
           }
           return;
         } catch (err) {
           this.log(err.message);
         }
       }
     });
     return metadata ? metadata : {};
   },
 
   /**
    * Attempts to get excerpt and byline metadata for the article.
    *
    * @param {Object} jsonld — object containing any metadata that
    * could be extracted from JSON-LD object.
    *
    * @return Object with optional "excerpt" and "byline" properties
    */
   _getArticleMetadata: function (jsonld) {
     var metadata = {};
     var values = {};
     var metaElements = this._doc.getElementsByTagName("meta");
 
     // property is a space-separated list of values
     var propertyPattern =
       /\s*(dc|dcterm|og|twitter)\s*:\s*(author|creator|description|title|site_name)\s*/gi;
 
     // name is a single value
     var namePattern =
       /^\s*(?:(dc|dcterm|og|twitter|weibo:(article|webpage))\s*[\.:]\s*)?(author|creator|description|title|site_name)\s*$/i;
 
     // Find description tags.
     this._forEachNode(metaElements, function (element) {
       var elementName = element.getAttribute("name");
       var elementProperty = element.getAttribute("property");
       var content = element.getAttribute("content");
       if (!content) {
         return;
       }
       var matches = null;
       var name = null;
 
       if (elementProperty) {
         matches = elementProperty.match(propertyPattern);
         if (matches) {
           // Convert to lowercase, and remove any whitespace
           // so we can match below.
           name = matches[0].toLowerCase().replace(/\s/g, "");
           // multiple authors
           values[name] = content.trim();
         }
       }
       if (!matches && elementName && namePattern.test(elementName)) {
         name = elementName;
         if (content) {
           // Convert to lowercase, remove any whitespace, and convert dots
           // to colons so we can match below.
           name = name.toLowerCase().replace(/\s/g, "").replace(/\./g, ":");
           values[name] = content.trim();
         }
       }
     });
 
     // get title
     metadata.title =
       jsonld.title ||
       values["dc:title"] ||
       values["dcterm:title"] ||
       values["og:title"] ||
       values["weibo:article:title"] ||
       values["weibo:webpage:title"] ||
       values["title"] ||
       values["twitter:title"];
 
     if (!metadata.title) {
       metadata.title = this._getArticleTitle();
     }
 
     // get author
     metadata.byline =
       jsonld.byline ||
       values["dc:creator"] ||
       values["dcterm:creator"] ||
       values["author"];
 
     // get description
     metadata.excerpt =
       jsonld.excerpt ||
       values["dc:description"] ||
       values["dcterm:description"] ||
       values["og:description"] ||
       values["weibo:article:description"] ||
       values["weibo:webpage:description"] ||
       values["description"] ||
       values["twitter:description"];
 
     // get site name
     metadata.siteName = jsonld.siteName || values["og:site_name"];
 
     // in many sites the meta value is escaped with HTML entities,
     // so here we need to unescape it
     metadata.title = this._unescapeHtmlEntities(metadata.title);
     metadata.byline = this._unescapeHtmlEntities(metadata.byline);
     metadata.excerpt = this._unescapeHtmlEntities(metadata.excerpt);
     metadata.siteName = this._unescapeHtmlEntities(metadata.siteName);
 
     return metadata;
   },
 
   /**
    * Check if node is image, or if node contains exactly only one image
    * whether as a direct child or as its descendants.
    *
    * @param Element
    **/
   _isSingleImage: function (node) {
     if (node.tagName === "IMG") {
       return true;
     }
 
     if (node.children.length !== 1 || node.textContent.trim() !== "") {
       return false;
     }
 
     return this._isSingleImage(node.children[0]);
   },
 
   /**
    * Find all <noscript> that are located after <img> nodes, and which contain only one
    * <img> element. Replace the first image with the image from inside the <noscript> tag,
    * and remove the <noscript> tag. This improves the quality of the images we use on
    * some sites (e.g. Medium).
    *
    * @param Element
    **/
   _unwrapNoscriptImages: function (doc) {
     // Find img without source or attributes that might contains image, and remove it.
     // This is done to prevent a placeholder img is replaced by img from noscript in next step.
     var imgs = Array.from(doc.getElementsByTagName("img"));
     this._forEachNode(imgs, function (img) {
       for (var i = 0; i < img.attributes.length; i++) {
         var attr = img.attributes[i];
         switch (attr.name) {
           case "src":
           case "srcset":
           case "data-src":
           case "data-srcset":
             return;
         }
 
         if (/\.(jpg|jpeg|png|webp)/i.test(attr.value)) {
           return;
         }
       }
 
       img.parentNode.removeChild(img);
     });
 
     // Next find noscript and try to extract its image
     var noscripts = Array.from(doc.getElementsByTagName("noscript"));
     this._forEachNode(noscripts, function (noscript) {
       // Parse content of noscript and make sure it only contains image
       var tmp = doc.createElement("div");
       tmp.innerHTML = noscript.innerHTML;
       if (!this._isSingleImage(tmp)) {
         return;
       }
 
       // If noscript has previous sibling and it only contains image,
       // replace it with noscript content. However we also keep old
       // attributes that might contains image.
       var prevElement = noscript.previousElementSibling;
       if (prevElement && this._isSingleImage(prevElement)) {
         var prevImg = prevElement;
         if (prevImg.tagName !== "IMG") {
           prevImg = prevElement.getElementsByTagName("img")[0];
         }
 
         var newImg = tmp.getElementsByTagName("img")[0];
         for (var i = 0; i < prevImg.attributes.length; i++) {
           var attr = prevImg.attributes[i];
           if (attr.value === "") {
             continue;
           }
 
           if (
             attr.name === "src" ||
             attr.name === "srcset" ||
             /\.(jpg|jpeg|png|webp)/i.test(attr.value)
           ) {
             if (newImg.getAttribute(attr.name) === attr.value) {
               continue;
             }
 
             var attrName = attr.name;
             if (newImg.hasAttribute(attrName)) {
               attrName = "data-old-" + attrName;
             }
 
             newImg.setAttribute(attrName, attr.value);
           }
         }
 
         noscript.parentNode.replaceChild(tmp.firstElementChild, prevElement);
       }
     });
   },
 
   /**
    * Removes script tags from the document.
    *
    * @param Element
    **/
   _removeScripts: function (doc) {
     this._removeNodes(
       this._getAllNodesWithTag(doc, ["script"]),
       function (scriptNode) {
         scriptNode.nodeValue = "";
         scriptNode.removeAttribute("src");
         return true;
       },
     );
     this._removeNodes(this._getAllNodesWithTag(doc, ["noscript"]));
   },
 
   /**
    * Check if this node has only whitespace and a single element with given tag
    * Returns false if the DIV node contains non-empty text nodes
    * or if it contains no element with given tag or more than 1 element.
    *
    * @param Element
    * @param string tag of child element
    **/
   _hasSingleTagInsideElement: function (element, tag) {
     // There should be exactly 1 element child with given tag
     if (element.children.length != 1 || element.children[0].tagName !== tag) {
       return false;
     }
 
     // And there should be no text nodes with real content
     return !this._someNode(element.childNodes, function (node) {
       return (
         node.nodeType === this.TEXT_NODE &&
         this.REGEXPS.hasContent.test(node.textContent)
       );
     });
   },
 
   _isElementWithoutContent: function (node) {
     return (
       node.nodeType === this.ELEMENT_NODE &&
       node.textContent.trim().length == 0 &&
       (node.children.length == 0 ||
         node.children.length ==
           node.getElementsByTagName("br").length +
             node.getElementsByTagName("hr").length)
     );
   },
 
   /**
    * Determine whether element has any children block level elements.
    *
    * @param Element
    */
   _hasChildBlockElement: function (element) {
     return this._someNode(element.childNodes, function (node) {
       return (
         this.DIV_TO_P_ELEMS.has(node.tagName) ||
         this._hasChildBlockElement(node)
       );
     });
   },
 
   /***
    * Determine if a node qualifies as phrasing content.
    * https://developer.mozilla.org/en-US/docs/Web/Guide/HTML/Content_categories#Phrasing_content
    **/
   _isPhrasingContent: function (node) {
     return (
       node.nodeType === this.TEXT_NODE ||
       this.PHRASING_ELEMS.indexOf(node.tagName) !== -1 ||
       ((node.tagName === "A" ||
         node.tagName === "DEL" ||
         node.tagName === "INS") &&
         this._everyNode(node.childNodes, this._isPhrasingContent))
     );
   },
 
   _isWhitespace: function (node) {
     return (
       (node.nodeType === this.TEXT_NODE &&
         node.textContent.trim().length === 0) ||
       (node.nodeType === this.ELEMENT_NODE && node.tagName === "BR")
     );
   },
 
   /**
    * Get the inner text of a node - cross browser compatibly.
    * This also strips out any excess whitespace to be found.
    *
    * @param Element
    * @param Boolean normalizeSpaces (default: true)
    * @return string
    **/
   _getInnerText: function (e, normalizeSpaces) {
     normalizeSpaces =
       typeof normalizeSpaces === "undefined" ? true : normalizeSpaces;
     var textContent = e.textContent.trim();
 
     if (normalizeSpaces) {
       return textContent.replace(this.REGEXPS.normalize, " ");
     }
     return textContent;
   },
 
   /**
    * Get the number of times a string s appears in the node e.
    *
    * @param Element
    * @param string - what to split on. Default is ","
    * @return number (integer)
    **/
   _getCharCount: function (e, s) {
     s = s || ",";
     return this._getInnerText(e).split(s).length - 1;
   },
 
   /**
    * Remove the style attribute on every e and under.
    * TODO: Test if getElementsByTagName(*) is faster.
    *
    * @param Element
    * @return void
    **/
   _cleanStyles: function (e) {
     if (!e || e.tagName.toLowerCase() === "svg") return;
 
     // Remove `style` and deprecated presentational attributes
     for (var i = 0; i < this.PRESENTATIONAL_ATTRIBUTES.length; i++) {
       e.removeAttribute(this.PRESENTATIONAL_ATTRIBUTES[i]);
     }
 
     if (this.DEPRECATED_SIZE_ATTRIBUTE_ELEMS.indexOf(e.tagName) !== -1) {
       e.removeAttribute("width");
       e.removeAttribute("height");
     }
 
     var cur = e.firstElementChild;
     while (cur !== null) {
       this._cleanStyles(cur);
       cur = cur.nextElementSibling;
     }
   },
 
   /**
    * Get the density of links as a percentage of the content
    * This is the amount of text that is inside a link divided by the total text in the node.
    *
    * @param Element
    * @return number (float)
    **/
   _getLinkDensity: function (element) {
     var textLength = this._getInnerText(element).length;
     if (textLength === 0) return 0;
 
     var linkLength = 0;
 
     // XXX implement _reduceNodeList?
     this._forEachNode(element.getElementsByTagName("a"), function (linkNode) {
       var href = linkNode.getAttribute("href");
       var coefficient = href && this.REGEXPS.hashUrl.test(href) ? 0.3 : 1;
       linkLength += this._getInnerText(linkNode).length * coefficient;
     });
 
     return linkLength / textLength;
   },
 
   /**
    * Get an elements class/id weight. Uses regular expressions to tell if this
    * element looks good or bad.
    *
    * @param Element
    * @return number (Integer)
    **/
   _getClassWeight: function (e) {
     if (!this._flagIsActive(this.FLAG_WEIGHT_CLASSES)) return 0;
 
     var weight = 0;
 
     // Look for a special classname
     if (typeof e.className === "string" && e.className !== "") {
       if (this.REGEXPS.negative.test(e.className)) weight -= 25;
 
       if (this.REGEXPS.positive.test(e.className)) weight += 25;
     }
 
     // Look for a special ID
     if (typeof e.id === "string" && e.id !== "") {
       if (this.REGEXPS.negative.test(e.id)) weight -= 25;
 
       if (this.REGEXPS.positive.test(e.id)) weight += 25;
     }
 
     return weight;
   },
 
   /**
    * Clean a node of all elements of type "tag".
    * (Unless it's a youtube/vimeo video. People love movies.)
    *
    * @param Element
    * @param string tag to clean
    * @return void
    **/
   _clean: function (e, tag) {
     var isEmbed = ["object", "embed", "iframe"].indexOf(tag) !== -1;
 
     this._removeNodes(this._getAllNodesWithTag(e, [tag]), function (element) {
       // Allow youtube and vimeo videos through as people usually want to see those.
       if (isEmbed) {
         // First, check the elements attributes to see if any of them contain youtube or vimeo
         for (var i = 0; i < element.attributes.length; i++) {
           if (this.REGEXPS.videos.test(element.attributes[i].value)) {
             return false;
           }
         }
 
         // For embed with <object> tag, check inner HTML as well.
         if (
           element.tagName === "object" &&
           this.REGEXPS.videos.test(element.innerHTML)
         ) {
           return false;
         }
       }
 
       return true;
     });
   },
 
   /**
    * Check if a given node has one of its ancestor tag name matching the
    * provided one.
    * @param  HTMLElement node
    * @param  String      tagName
    * @param  Number      maxDepth
    * @param  Function    filterFn a filter to invoke to determine whether this node 'counts'
    * @return Boolean
    */
   _hasAncestorTag: function (node, tagName, maxDepth, filterFn) {
     maxDepth = maxDepth || 3;
     tagName = tagName.toUpperCase();
     var depth = 0;
     while (node.parentNode) {
       if (maxDepth > 0 && depth > maxDepth) return false;
       if (
         node.parentNode.tagName === tagName &&
         (!filterFn || filterFn(node.parentNode))
       )
         return true;
       node = node.parentNode;
       depth++;
     }
     return false;
   },
 
   /**
    * Return an object indicating how many rows and columns this table has.
    */
   _getRowAndColumnCount: function (table) {
     var rows = 0;
     var columns = 0;
     var trs = table.getElementsByTagName("tr");
     for (var i = 0; i < trs.length; i++) {
       var rowspan = trs[i].getAttribute("rowspan") || 0;
       if (rowspan) {
         rowspan = parseInt(rowspan, 10);
       }
       rows += rowspan || 1;
 
       // Now look for column-related info
       var columnsInThisRow = 0;
       var cells = trs[i].getElementsByTagName("td");
       for (var j = 0; j < cells.length; j++) {
         var colspan = cells[j].getAttribute("colspan") || 0;
         if (colspan) {
           colspan = parseInt(colspan, 10);
         }
         columnsInThisRow += colspan || 1;
       }
       columns = Math.max(columns, columnsInThisRow);
     }
     return { rows: rows, columns: columns };
   },
 
   /**
    * Look for 'data' (as opposed to 'layout') tables, for which we use
    * similar checks as
    * https://searchfox.org/mozilla-central/rev/f82d5c549f046cb64ce5602bfd894b7ae807c8f8/accessible/generic/TableAccessible.cpp#19
    */
   _markDataTables: function (root) {
     var tables = root.getElementsByTagName("table");
     for (var i = 0; i < tables.length; i++) {
       var table = tables[i];
       var role = table.getAttribute("role");
       if (role == "presentation") {
         table._readabilityDataTable = false;
         continue;
       }
       var datatable = table.getAttribute("datatable");
       if (datatable == "0") {
         table._readabilityDataTable = false;
         continue;
       }
       var summary = table.getAttribute("summary");
       if (summary) {
         table._readabilityDataTable = true;
         continue;
       }
 
       var caption = table.getElementsByTagName("caption")[0];
       if (caption && caption.childNodes.length > 0) {
         table._readabilityDataTable = true;
         continue;
       }
 
       // If the table has a descendant with any of these tags, consider a data table:
       var dataTableDescendants = ["col", "colgroup", "tfoot", "thead", "th"];
       var descendantExists = function (tag) {
         return !!table.getElementsByTagName(tag)[0];
       };
       if (dataTableDescendants.some(descendantExists)) {
         this.log("Data table because found data-y descendant");
         table._readabilityDataTable = true;
         continue;
       }
 
       // Nested tables indicate a layout table:
       if (table.getElementsByTagName("table")[0]) {
         table._readabilityDataTable = false;
         continue;
       }
 
       var sizeInfo = this._getRowAndColumnCount(table);
       if (sizeInfo.rows >= 10 || sizeInfo.columns > 4) {
         table._readabilityDataTable = true;
         continue;
       }
       // Now just go by size entirely:
       table._readabilityDataTable = sizeInfo.rows * sizeInfo.columns > 10;
     }
   },
 
   /* convert images and figures that have properties like data-src into images that can be loaded without JS */
   _fixLazyImages: function (root) {
     this._forEachNode(
       this._getAllNodesWithTag(root, ["img", "picture", "figure"]),
       function (elem) {
         // In some sites (e.g. Kotaku), they put 1px square image as base64 data uri in the src attribute.
         // So, here we check if the data uri is too short, just might as well remove it.
         if (elem.src && this.REGEXPS.b64DataUrl.test(elem.src)) {
           // Make sure it's not SVG, because SVG can have a meaningful image in under 133 bytes.
           var parts = this.REGEXPS.b64DataUrl.exec(elem.src);
           if (parts[1] === "image/svg+xml") {
             return;
           }
 
           // Make sure this element has other attributes which contains image.
           // If it doesn't, then this src is important and shouldn't be removed.
           var srcCouldBeRemoved = false;
           for (var i = 0; i < elem.attributes.length; i++) {
             var attr = elem.attributes[i];
             if (attr.name === "src") {
               continue;
             }
 
             if (/\.(jpg|jpeg|png|webp)/i.test(attr.value)) {
               srcCouldBeRemoved = true;
               break;
             }
           }
 
           // Here we assume if image is less than 100 bytes (or 133B after encoded to base64)
           // it will be too small, therefore it might be placeholder image.
           if (srcCouldBeRemoved) {
             var b64starts = elem.src.search(/base64\s*/i) + 7;
             var b64length = elem.src.length - b64starts;
             if (b64length < 133) {
               elem.removeAttribute("src");
             }
           }
         }
 
         // also check for "null" to work around https://github.com/jsdom/jsdom/issues/2580
         if (
           (elem.src || (elem.srcset && elem.srcset != "null")) &&
           elem.className.toLowerCase().indexOf("lazy") === -1
         ) {
           return;
         }
 
         for (var j = 0; j < elem.attributes.length; j++) {
           attr = elem.attributes[j];
           if (
             attr.name === "src" ||
             attr.name === "srcset" ||
             attr.name === "alt"
           ) {
             continue;
           }
           var copyTo = null;
           if (/\.(jpg|jpeg|png|webp)\s+\d/.test(attr.value)) {
             copyTo = "srcset";
           } else if (/^\s*\S+\.(jpg|jpeg|png|webp)\S*\s*$/.test(attr.value)) {
             copyTo = "src";
           }
           if (copyTo) {
             //if this is an img or picture, set the attribute directly
             if (elem.tagName === "IMG" || elem.tagName === "PICTURE") {
               elem.setAttribute(copyTo, attr.value);
             } else if (
               elem.tagName === "FIGURE" &&
               !this._getAllNodesWithTag(elem, ["img", "picture"]).length
             ) {
               //if the item is a <figure> that does not contain an image or picture, create one and place it inside the figure
               //see the nytimes-3 testcase for an example
               var img = this._doc.createElement("img");
               img.setAttribute(copyTo, attr.value);
               elem.appendChild(img);
             }
           }
         }
       },
     );
   },
 
   _getTextDensity: function (e, tags) {
     var textLength = this._getInnerText(e, true).length;
     if (textLength === 0) {
       return 0;
     }
     var childrenLength = 0;
     var children = this._getAllNodesWithTag(e, tags);
     this._forEachNode(
       children,
       (child) => (childrenLength += this._getInnerText(child, true).length),
     );
     return childrenLength / textLength;
   },
 
   /**
    * Clean an element of all tags of type "tag" if they look fishy.
    * "Fishy" is an algorithm based on content length, classnames, link density, number of images & embeds, etc.
    *
    * @return void
    **/
   _cleanConditionally: function (e, tag) {
     if (!this._flagIsActive(this.FLAG_CLEAN_CONDITIONALLY)) return;
 
     // Gather counts for other typical elements embedded within.
     // Traverse backwards so we can remove nodes at the same time
     // without effecting the traversal.
     //
     // TODO: Consider taking into account original contentScore here.
     this._removeNodes(this._getAllNodesWithTag(e, [tag]), function (node) {
       // First check if this node IS data table, in which case don't remove it.
       var isDataTable = function (t) {
         return t._readabilityDataTable;
       };
 
       var isList = tag === "ul" || tag === "ol";
       if (!isList) {
         var listLength = 0;
         var listNodes = this._getAllNodesWithTag(node, ["ul", "ol"]);
         this._forEachNode(
           listNodes,
           (list) => (listLength += this._getInnerText(list).length),
         );
         isList = listLength / this._getInnerText(node).length > 0.9;
       }
 
       if (tag === "table" && isDataTable(node)) {
         return false;
       }
 
       // Next check if we're inside a data table, in which case don't remove it as well.
       if (this._hasAncestorTag(node, "table", -1, isDataTable)) {
         return false;
       }
 
       if (this._hasAncestorTag(node, "code")) {
         return false;
       }
 
       var weight = this._getClassWeight(node);
 
       this.log("Cleaning Conditionally", node);
 
       var contentScore = 0;
 
       if (weight + contentScore < 0) {
         return true;
       }
 
       if (this._getCharCount(node, ",") < 10) {
         // If there are not very many commas, and the number of
         // non-paragraph elements is more than paragraphs or other
         // ominous signs, remove the element.
         var p = node.getElementsByTagName("p").length;
         var img = node.getElementsByTagName("img").length;
         var li = node.getElementsByTagName("li").length - 100;
         var input = node.getElementsByTagName("input").length;
         var headingDensity = this._getTextDensity(node, [
           "h1",
           "h2",
           "h3",
           "h4",
           "h5",
           "h6",
         ]);
 
         var embedCount = 0;
         var embeds = this._getAllNodesWithTag(node, [
           "object",
           "embed",
           "iframe",
         ]);
 
         for (var i = 0; i < embeds.length; i++) {
           // If this embed has attribute that matches video regex, don't delete it.
           for (var j = 0; j < embeds[i].attributes.length; j++) {
             if (this.REGEXPS.videos.test(embeds[i].attributes[j].value)) {
               return false;
             }
           }
 
           // For embed with <object> tag, check inner HTML as well.
           if (
             embeds[i].tagName === "object" &&
             this.REGEXPS.videos.test(embeds[i].innerHTML)
           ) {
             return false;
           }
 
           embedCount++;
         }
 
         var linkDensity = this._getLinkDensity(node);
         var contentLength = this._getInnerText(node).length;
 
         var haveToRemove =
           (img > 1 && p / img < 0.5 && !this._hasAncestorTag(node, "figure")) ||
           (!isList && li > p) ||
           input > Math.floor(p / 3) ||
           (!isList &&
             headingDensity < 0.9 &&
             contentLength < 25 &&
             (img === 0 || img > 2) &&
             !this._hasAncestorTag(node, "figure")) ||
           (!isList && weight < 25 && linkDensity > 0.2) ||
           (weight >= 25 && linkDensity > 0.5) ||
           (embedCount === 1 && contentLength < 75) ||
           embedCount > 1;
         // Allow simple lists of images to remain in pages
         if (isList && haveToRemove) {
           for (var x = 0; x < node.children.length; x++) {
             let child = node.children[x];
             // Don't filter in lists with li's that contain more than one child
             if (child.children.length > 1) {
               return haveToRemove;
             }
           }
           li_count = node.getElementsByTagName("li").length;
           // Only allow the list to remain if every li contains an image
           if (img == li_count) {
             return false;
           }
         }
         return haveToRemove;
       }
       return false;
     });
   },
 
   /**
    * Clean out elements that match the specified conditions
    *
    * @param Element
    * @param Function determines whether a node should be removed
    * @return void
    **/
   _cleanMatchedNodes: function (e, filter) {
     var endOfSearchMarkerNode = this._getNextNode(e, true);
     var next = this._getNextNode(e);
     while (next && next != endOfSearchMarkerNode) {
       if (filter.call(this, next, next.className + " " + next.id)) {
         next = this._removeAndGetNext(next);
       } else {
         next = this._getNextNode(next);
       }
     }
   },
 
   /**
    * Clean out spurious headers from an Element.
    *
    * @param Element
    * @return void
    **/
   _cleanHeaders: function (e) {
     let headingNodes = this._getAllNodesWithTag(e, ["h1", "h2"]);
     this._removeNodes(headingNodes, function (node) {
       let shouldRemove = this._getClassWeight(node) < 0;
       if (shouldRemove) {
         this.log("Removing header with low class weight:", node);
       }
       return shouldRemove;
     });
   },
 
   /**
    * Check if this node is an H1 or H2 element whose content is mostly
    * the same as the article title.
    *
    * @param Element  the node to check.
    * @return boolean indicating whether this is a title-like header.
    */
   _headerDuplicatesTitle: function (node) {
     if (node.tagName != "H1" && node.tagName != "H2") {
       return false;
     }
     var heading = this._getInnerText(node, false);
     this.log("Evaluating similarity of header:", heading, this._articleTitle);
     return this._textSimilarity(this._articleTitle, heading) > 0.75;
   },
 
   _flagIsActive: function (flag) {
     return (this._flags & flag) > 0;
   },
 
   _removeFlag: function (flag) {
     this._flags = this._flags & ~flag;
   },
 
   _isProbablyVisible: function (node) {
     // Have to null-check node.style and node.className.indexOf to deal with SVG and MathML nodes.
     return (
       (!node.style || node.style.display != "none") &&
       !node.hasAttribute("hidden") &&
       //check for "fallback-image" so that wikimedia math images are displayed
       (!node.hasAttribute("aria-hidden") ||
         node.getAttribute("aria-hidden") != "true" ||
         (node.className &&
           node.className.indexOf &&
           node.className.indexOf("fallback-image") !== -1))
     );
   },
 
   /**
    * Runs readability.
    *
    * Workflow:
    *  1. Prep the document by removing script tags, css, etc.
    *  2. Build readability's DOM tree.
    *  3. Grab the article content from the current dom tree.
    *  4. Replace the current DOM tree with the new one.
    *  5. Read peacefully.
    *
    * @return void
    **/
   parse: function () {
     // Avoid parsing too large documents, as per configuration option
     if (this._maxElemsToParse > 0) {
       var numTags = this._doc.getElementsByTagName("*").length;
       if (numTags > this._maxElemsToParse) {
         throw new Error(
           "Aborting parsing document; " + numTags + " elements found",
         );
       }
     }
 
     // Unwrap image from noscript
     this._unwrapNoscriptImages(this._doc);
 
     // Extract JSON-LD metadata before removing scripts
     var jsonLd = this._disableJSONLD ? {} : this._getJSONLD(this._doc);
 
     // Remove script tags from the document.
     this._removeScripts(this._doc);
 
     this._prepDocument();
 
     var metadata = this._getArticleMetadata(jsonLd);
     this._articleTitle = metadata.title;
 
     var articleContent = this._grabArticle();
     if (!articleContent) return null;
 
     this.log("Grabbed: " + articleContent.innerHTML);
 
     this._postProcessContent(articleContent);
 
     // If we haven't found an excerpt in the article's metadata, use the article's
     // first paragraph as the excerpt. This is used for displaying a preview of
     // the article's content.
     if (!metadata.excerpt) {
       var paragraphs = articleContent.getElementsByTagName("p");
       if (paragraphs.length > 0) {
         metadata.excerpt = paragraphs[0].textContent.trim();
       }
     }
 
     var textContent = articleContent.textContent;
     return {
       title: this._articleTitle,
       byline: metadata.byline || this._articleByline,
       dir: this._articleDir,
       lang: this._articleLang,
       content: this._serializer(articleContent),
       textContent: textContent,
       length: textContent.length,
       excerpt: metadata.excerpt,
       siteName: metadata.siteName || this._articleSiteName,
     };
   },
 };
 
 if (typeof module === "object") {
   module.exports = Readability;
 }
 
 /* Define a css stylesheet */
 
 var style_sheet_simple = `
 <style type="text/css">
 
 body {
       padding: 40px 200px 40px 200px !important;
       font-size: 18px;
       font: 18px/1.5 Roboto;
       line-height: 1.6;
       background-color: #FEFEFE !important;
       color: #444 !important;
       max-width: 99% !important;
 }
 
 #readOverlay {
        display: block;
        position: absolute;
        background-color: white;
        top: 0;
        left: 0;
        width: 100%;
 }
 
 /* Block quotes */
 
 blockquote{
   width:60%;
   margin: 5px auto;
   font-style:italic;
   color: #555555;
   padding: 1.2em 30px 1.2em 75px;
   border-left:8px solid #005386 ;
   line-height:1.3;
   position: relative;
   background: #F0F0F0;
 }
 
 blockquote::before{
   font-family: Arial;
   content: "\\201C";
   color: #005386;
   font-size: 6em;
   position: absolute;
   left: 10px;
   top:-10px;
 
 }
 
 a[href^="#footnote-"] {
     text-decoration: none;
 }
 a[href^="#footnote-"]::before {
     content:" [";
 }
 a[href^="#footnote-"]::after {
     content:"] ";
 }
 
 </style>`;
 
 /*
 body {
        max-width: 650px;
        margin: 40px auto;
        padding: 0 10px;
        font: 18px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
        color: #444
 }
 */
 /* See also
  * <https://gist.github.com/aanand/399131>
  * and the one included in firefox @ <chrome://global/skin/aboutReader.css>
  */
 var documentClone = document.cloneNode(true);
 var article = new Readability(documentClone).parse();
 document.head.innerHTML = `<title>${article.title}</title>\n${style_sheet_simple}`;
 document.body.innerHTML = `<h1>${article.title}</h1>\n${article.content}`;
 
 /* Hack for archive.is */
 var styles = `
 img {
   max-width: 80% !important;
 	height: auto;
   display: block;
   margin-left: auto;
   margin-right: auto;
 }
 `;
 
 if (document.domain == "archive.is") {
   styles += `
 
   li > span {
 			display: none !important;
   }
 
 	/* Matt Levine's Money Stuff specific stuff: */
 
 	p > span > em {
 			display: none !important;
 	}
   iframe {
 	  display: none;
   }
 	#div[id^='stickypbModal'] {
 	 display: none;
 	}
   `;
 }
 
 var styleSheet = document.createElement("style");
 styleSheet.innerText = styles;
 document.head.appendChild(styleSheet);
 console.log("Style changed");