diff -r 000000000000 -r 6474c204b198 mobile/android/chrome/content/Readability.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mobile/android/chrome/content/Readability.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,1517 @@
+/*
+ * 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
+ */
+
+var Readability = function(uri, doc) {
+  const ENABLE_LOGGING = false;
+
+  this._uri = uri;
+  this._doc = doc;
+  this._biggestFrame = false;
+  this._articleByline = null;
+  this._articleDir = null;
+
+  // Start with all flags set
+  this._flags = this.FLAG_STRIP_UNLIKELYS |
+                this.FLAG_WEIGHT_CLASSES |
+                this.FLAG_CLEAN_CONDITIONALLY;
+
+  // The list of pages we've parsed in this call of readability,
+  // for autopaging. As a key store for easier searching.
+  this._parsedPages = {};
+
+  // A list of the ETag headers of pages we've parsed, in case they happen to match,
+  // we'll know it's a duplicate.
+  this._pageETags = {};
+
+  // Make an AJAX request for each page and append it to the document.
+  this._curPageNum = 1;
+
+  // Control whether log messages are sent to the console
+  if (ENABLE_LOGGING) {
+    this.log = function (msg) {
+      dump("Reader: (Readability) " + msg);
+    };
+  } else {
+    this.log = function () {};
+  }
+}
+
+Readability.prototype = {
+  FLAG_STRIP_UNLIKELYS: 0x1,
+  FLAG_WEIGHT_CLASSES: 0x2,
+  FLAG_CLEAN_CONDITIONALLY: 0x4,
+
+  // The number of top candidates to consider when analysing how
+  // tight the competition is among candidates.
+  N_TOP_CANDIDATES: 5,
+
+  // The maximum number of pages to loop through before we call
+  // it quits and just show a link.
+  MAX_PAGES: 5,
+
+  // All of the regular expressions in use within readability.
+  // Defined up here so we don't instantiate them repeatedly in loops.
+  REGEXPS: {
+    unlikelyCandidates: /combx|comment|community|disqus|extra|foot|header|menu|remark|rss|shoutbox|sidebar|sponsor|ad-break|agegate|pagination|pager|popup|tweet|twitter/i,
+    okMaybeItsACandidate: /and|article|body|column|main|shadow/i,
+    positive: /article|body|content|entry|hentry|main|page|pagination|post|text|blog|story/i,
+    negative: /hidden|combx|comment|com-|contact|foot|footer|footnote|masthead|media|meta|outbrain|promo|related|scroll|shoutbox|sidebar|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/i,
+    replaceFonts: /<(\/?)font[^>]*>/gi,
+    trim: /^\s+|\s+$/g,
+    normalize: /\s{2,}/g,
+    videos: /http:\/\/(www\.)?(youtube|vimeo)\.com/i,
+    nextLink: /(next|weiter|continue|>([^\|]|$)|»([^\|]|$))/i,
+    prevLink: /(prev|earl|old|new|<|«)/i,
+    whitespace: /^\s*$/
+  },
+
+  DIV_TO_P_ELEMS: [ "A", "BLOCKQUOTE", "DL", "DIV", "IMG", "OL", "P", "PRE", "TABLE", "UL", "SELECT" ],
+
+  /**
+   * 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);
+  },
+
+  /**
+   * Converts each <a> and <img> uri in the given element to an absolute URI.
+   *
+   * @param Element
+   * @return void
+   */
+  _fixRelativeUris: function(articleContent) {
+    let scheme = this._uri.scheme;
+    let prePath = this._uri.prePath;
+    let pathBase = this._uri.pathBase;
+
+    function toAbsoluteURI(uri) {
+      // If this is already an absolute URI, return it.
+      if (/^[a-zA-Z][a-zA-Z0-9\+\-\.]*:/.test(uri))
+        return uri;
+
+      // Scheme-rooted relative URI.
+      if (uri.substr(0, 2) == "//")
+        return scheme + "://" + uri.substr(2);
+
+      // Prepath-rooted relative URI.
+      if (uri[0] == "/")
+        return prePath + uri;
+
+      // Standard relative URI; add entire path. pathBase already includes a
+      // trailing "/".
+      return pathBase + uri;
+    }
+
+    function convertRelativeURIs(tagName, propName) {
+      let elems = articleContent.getElementsByTagName(tagName);
+      for (let i = elems.length; --i >= 0;) {
+        let elem = elems[i];
+        let relativeURI = elem.getAttribute(propName);
+        if (relativeURI != null)
+          elems[i].setAttribute(propName, toAbsoluteURI(relativeURI));
+      }
+    }
+
+     // Fix links.
+    convertRelativeURIs("a", "href");
+
+     // Fix images.
+    convertRelativeURIs("img", "src");
+  },
+
+  /**
+   * Get the article title as an H1.
+   *
+   * @return void
+   **/
+  _getArticleTitle: function() {
+    let doc = this._doc;
+    let curTitle = "";
+    let origTitle = "";
+
+    try {
+      curTitle = origTitle = doc.title;
+
+      // 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) {}
+
+    if (curTitle.match(/ [\|\-] /)) {
+      curTitle = origTitle.replace(/(.*)[\|\-] .*/gi,'$1');
+
+      if (curTitle.split(' ').length < 3)
+        curTitle = origTitle.replace(/[^\|\-]*[\|\-](.*)/gi,'$1');
+    } else if (curTitle.indexOf(': ') !== -1) {
+      curTitle = origTitle.replace(/.*:(.*)/gi, '$1');
+
+      if (curTitle.split(' ').length < 3)
+        curTitle = origTitle.replace(/[^:]*[:](.*)/gi,'$1');
+    } else if (curTitle.length > 150 || curTitle.length < 15) {
+      let hOnes = doc.getElementsByTagName('h1');
+
+      if (hOnes.length === 1)
+        curTitle = this._getInnerText(hOnes[0]);
+    }
+
+    curTitle = curTitle.replace(this.REGEXPS.trim, "");
+
+    if (curTitle.split(' ').length <= 4)
+      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() {
+    let doc = this._doc;
+
+    // In some cases a body element can't be found (if the HTML is
+    // totally hosed for example) so we create a new body node and
+    // append it to the document.
+    if (doc.body === null) {
+      let body = doc.createElement("body");
+
+      try {
+        doc.body = body;
+      } catch(e) {
+        doc.documentElement.appendChild(body);
+        this.log(e);
+      }
+    }
+
+    // Remove all style tags in head
+    let styleTags = doc.getElementsByTagName("style");
+    for (let st = 0; st < styleTags.length; st += 1) {
+      styleTags[st].textContent = "";
+    }
+
+    this._replaceBrs(doc.body);
+
+    let fonts = doc.getElementsByTagName("FONT");
+    for (let i = fonts.length; --i >=0;) {
+      this._setNodeTag(fonts[i], "SPAN");
+    }
+  },
+
+  /**
+   * Finds the next element, starting from the given node, and ignoring
+   * whitespace in between. If the given node is an element, the same node is
+   * returned.
+   */
+  _nextElement: function (node) {
+    let next = node;
+    while (next
+        && (next.nodeType != Node.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) {
+    let brs = elem.getElementsByTagName("br");
+    for (let i = 0; i < brs.length; i++) {
+      let br = brs[i];
+      let next = br.nextSibling;
+
+      // Whether 2 or more <br> elements have been found and replaced with a
+      // <p> block.
+      let replaced = false;
+
+      // If we find a <br> chain, remove the <br>s until we hit another element
+      // or non-whitespace. This leaves behind the first <br> in the chain
+      // (which will be replaced with a <p> later).
+      while ((next = this._nextElement(next)) && (next.tagName == "BR")) {
+        replaced = true;
+        let sibling = next.nextSibling;
+        next.parentNode.removeChild(next);
+        next = sibling;
+      }
+
+      // 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) {
+        let 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") {
+            let nextElem = this._nextElement(next);
+            if (nextElem && nextElem.tagName == "BR")
+              break;
+          }
+          
+          // Otherwise, make this node a child of the new <p>.
+          let sibling = next.nextSibling;
+          p.appendChild(next);
+          next = sibling;
+        }
+      }
+    }
+  },
+
+  _setNodeTag: function (node, tag) {
+    node.localName = tag.toLowerCase();
+    node.tagName = tag.toUpperCase();
+  },
+
+  /**
+   * 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);
+
+    // Clean out junk from the article content
+    this._cleanConditionally(articleContent, "form");
+    this._clean(articleContent, "object");
+    this._clean(articleContent, "h1");
+
+    // If there is only one h2, they are probably using it as a header
+    // and not a subheader, so remove it since we already have a header.
+    if (articleContent.getElementsByTagName('h2').length === 1)
+      this._clean(articleContent, "h2");
+
+    this._clean(articleContent, "iframe");
+    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");
+
+    // Remove extra paragraphs
+    let articleParagraphs = articleContent.getElementsByTagName('p');
+    for (let i = articleParagraphs.length - 1; i >= 0; i -= 1) {
+      let imgCount = articleParagraphs[i].getElementsByTagName('img').length;
+      let embedCount = articleParagraphs[i].getElementsByTagName('embed').length;
+      let objectCount = articleParagraphs[i].getElementsByTagName('object').length;
+
+      if (imgCount === 0 &&
+        embedCount === 0 &&
+        objectCount === 0 &&
+        this._getInnerText(articleParagraphs[i], false) === '')
+        articleParagraphs[i].parentNode.removeChild(articleParagraphs[i]);
+    }
+
+    let brs = articleContent.getElementsByTagName("BR");
+    for (let i = brs.length; --i >= 0;) {
+      let br = brs[i];
+      let next = this._nextElement(br.nextSibling);
+      if (next && next.tagName == "P")
+        br.parentNode.removeChild(br);
+    }
+  },
+
+  /**
+   * 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);
+  },
+
+  /***
+   * 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) {
+    let doc = this._doc;
+    let isPaging = (page !== null ? true: false);
+    page = page ? page : this._doc.body;
+    let pageCacheHtml = page.innerHTML;
+
+    // Check if any "dir" is set on the toplevel document element
+    this._articleDir = doc.documentElement.getAttribute("dir");
+
+    while (true) {
+      let stripUnlikelyCandidates = this._flagIsActive(this.FLAG_STRIP_UNLIKELYS);
+      let allElements = page.getElementsByTagName('*');
+
+      // 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.)
+      //
+      // Note: Assignment from index for performance. See http://www.peachpit.com/articles/article.aspx?p=31567&seqNum=5
+      // TODO: Shouldn't this be a reverse traversal?
+      let node = null;
+      let nodesToScore = [];
+
+      // Let each node know its index in the allElements array.
+      for (let i = allElements.length; --i >= 0;) {
+        allElements[i]._index = i;
+      }
+
+      /**
+       * JSDOMParser returns static node lists, not live ones. When we remove
+       * an element from the document, we need to manually remove it - and all
+       * of its children - from the allElements array.
+       */
+      function purgeNode(node) {
+        for (let i = node.childNodes.length; --i >= 0;) {
+          purgeNode(node.childNodes[i]);
+        }
+        if (node._index !== undefined && allElements[node._index] == node)
+          delete allElements[node._index];
+      }
+
+      for (let nodeIndex = 0; nodeIndex < allElements.length; nodeIndex++) {
+        if (!(node = allElements[nodeIndex]))
+          continue;
+
+        let matchString = node.className + node.id;
+        if (matchString.search(this.REGEXPS.byline) !== -1 && !this._articleByline) {
+          this._articleByline = node.textContent;
+          node.parentNode.removeChild(node);
+          purgeNode(node);
+          continue;
+        }
+
+        // Remove unlikely candidates
+        if (stripUnlikelyCandidates) {
+          if (matchString.search(this.REGEXPS.unlikelyCandidates) !== -1 &&
+            matchString.search(this.REGEXPS.okMaybeItsACandidate) === -1 &&
+            node.tagName !== "BODY") {
+            this.log("Removing unlikely candidate - " + matchString);
+            node.parentNode.removeChild(node);
+            purgeNode(node);
+            continue;
+          }
+        }
+
+        if (node.tagName === "P" || node.tagName === "TD" || node.tagName === "PRE")
+          nodesToScore[nodesToScore.length] = node;
+
+        // Turn all divs that don't have children block level elements into p's
+        if (node.tagName === "DIV") {
+          // 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.
+          let pIndex = this._getSinglePIndexInsideDiv(node);
+
+          if (pIndex >= 0 || !this._hasChildBlockElement(node)) {
+            if (pIndex >= 0) {
+              let newNode = node.childNodes[pIndex];
+              node.parentNode.replaceChild(newNode, node);
+              purgeNode(node);
+            } else {
+              this._setNodeTag(node, "P");
+              nodesToScore[nodesToScore.length] = node;
+            }
+          } else {
+            // EXPERIMENTAL
+            for (let i = 0, il = node.childNodes.length; i < il; i += 1) {
+              let childNode = node.childNodes[i];
+              if (!childNode)
+                continue;
+
+              if (childNode.nodeType === 3) { // Node.TEXT_NODE
+                let p = doc.createElement('p');
+                p.textContent = childNode.textContent;
+                p.style.display = 'inline';
+                p.className = 'readability-styled';
+                childNode.parentNode.replaceChild(p, childNode);
+              }
+            }
+          }
+        }
+      }
+
+      /**
+       * 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.
+      **/
+      let candidates = [];
+      for (let pt = 0; pt < nodesToScore.length; pt += 1) {
+        let parentNode = nodesToScore[pt].parentNode;
+        let grandParentNode = parentNode ? parentNode.parentNode : null;
+        let innerText = this._getInnerText(nodesToScore[pt]);
+
+        if (!parentNode || typeof(parentNode.tagName) === 'undefined')
+          continue;
+
+        // If this paragraph is less than 25 characters, don't even count it.
+        if (innerText.length < 25)
+          continue;
+
+        // Initialize readability data for the parent.
+        if (typeof parentNode.readability === 'undefined') {
+          this._initializeNode(parentNode);
+          candidates.push(parentNode);
+        }
+
+        // Initialize readability data for the grandparent.
+        if (grandParentNode &&
+          typeof(grandParentNode.readability) === 'undefined' &&
+          typeof(grandParentNode.tagName) !== 'undefined') {
+          this._initializeNode(grandParentNode);
+          candidates.push(grandParentNode);
+        }
+
+        let 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);
+
+        // Add the score to the parent. The grandparent gets half.
+        parentNode.readability.contentScore += contentScore;
+
+        if (grandParentNode)
+          grandParentNode.readability.contentScore += contentScore / 2;
+      }
+
+      // After we've calculated scores, loop through all of the possible
+      // candidate nodes we found and find the one with the highest score.
+      let topCandidates = [];
+      for (let c = 0, cl = candidates.length; c < cl; c += 1) {
+        let 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.
+        let candidateScore = candidate.readability.contentScore * (1 - this._getLinkDensity(candidate));
+        candidate.readability.contentScore = candidateScore;
+
+        this.log('Candidate: ' + candidate + " (" + candidate.className + ":" +
+          candidate.id + ") with score " + candidateScore);
+
+        for (let t = 0; t < this.N_TOP_CANDIDATES; t++) {
+          let aTopCandidate = topCandidates[t];
+
+          if (!aTopCandidate || candidateScore > aTopCandidate.readability.contentScore) {
+            topCandidates.splice(t, 0, candidate);
+            if (topCandidates.length > this.N_TOP_CANDIDATES)
+              topCandidates.pop();
+            break;
+          }
+        }
+      }
+
+      let topCandidate = topCandidates[0] || null;
+      let lastTopCandidate = (topCandidates.length > 3 ? topCandidates[topCandidates.length - 1] : null);
+
+      // 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");
+        let children = page.childNodes;
+        for (let i = 0; i < children.length; ++i) {
+          topCandidate.appendChild(children[i]);
+        }
+
+        page.appendChild(topCandidate);
+
+        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.
+      let articleContent = doc.createElement("DIV");
+      if (isPaging)
+        articleContent.id = "readability-content";
+
+      let siblingScoreThreshold = Math.max(10, topCandidate.readability.contentScore * 0.2);
+      let siblingNodes = topCandidate.parentNode.childNodes;
+
+      for (let s = 0, sl = siblingNodes.length; s < sl; s += 1) {
+        let siblingNode = siblingNodes[s];
+        let append = false;
+
+        this.log("Looking at sibling node: " + siblingNode + " (" + siblingNode.className + ":" + siblingNode.id + ")" + ((typeof siblingNode.readability !== 'undefined') ? (" with score " + siblingNode.readability.contentScore) : ''));
+        this.log("Sibling has score " + (siblingNode.readability ? siblingNode.readability.contentScore : 'Unknown'));
+
+        if (siblingNode === topCandidate)
+          append = true;
+
+        let contentBonus = 0;
+
+        // Give a bonus if sibling nodes and top candidates have the example same classname
+        if (siblingNode.className === topCandidate.className && topCandidate.className !== "")
+          contentBonus += topCandidate.readability.contentScore * 0.2;
+
+        if (typeof siblingNode.readability !== 'undefined' &&
+          (siblingNode.readability.contentScore+contentBonus) >= siblingScoreThreshold)
+          append = true;
+
+        if (siblingNode.nodeName === "P") {
+          let linkDensity = this._getLinkDensity(siblingNode);
+          let nodeContent = this._getInnerText(siblingNode);
+          let nodeLength = nodeContent.length;
+
+          if (nodeLength > 80 && linkDensity < 0.25) {
+            append = true;
+          } else if (nodeLength < 80 && linkDensity === 0 && nodeContent.search(/\.( |$)/) !== -1) {
+            append = true;
+          }
+        }
+
+        if (append) {
+          this.log("Appending node: " + siblingNode);
+
+          // siblingNodes is a reference to the childNodes array, and
+          // siblingNode is removed from the array when we call appendChild()
+          // below. As a result, we must revisit this index since the nodes
+          // have been shifted.
+          s -= 1;
+          sl -= 1;
+
+          if (siblingNode.nodeName !== "DIV" && siblingNode.nodeName !== "P") {
+            // 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 siblingNode of " + siblingNode.nodeName + ' to div.');
+
+            this._setNodeTag(siblingNode, "DIV");
+          }
+
+          // To ensure a node does not interfere with readability styles,
+          // remove its classnames.
+          siblingNode.className = "";
+
+          // Append sibling and subtract from our list because it removes
+          // the node when you append to another node.
+          articleContent.appendChild(siblingNode);
+        }
+      }
+
+      // So we have all of the content that we need. Now we clean it up for presentation.
+      this._prepArticle(articleContent);
+
+      if (this._curPageNum === 1) {
+        let div = doc.createElement("DIV");
+        div.id = "readability-page-1";
+        div.className = "page";
+        let children = articleContent.childNodes;
+        for (let i = 0; i < children.length; ++i) {
+          div.appendChild(children[i]);
+        }
+        articleContent.appendChild(div);
+      }
+
+      // 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.
+      if (this._getInnerText(articleContent, true).length < 500) {
+        page.innerHTML = pageCacheHtml;
+
+        if (this._flagIsActive(this.FLAG_STRIP_UNLIKELYS)) {
+          this._removeFlag(this.FLAG_STRIP_UNLIKELYS);
+        } else if (this._flagIsActive(this.FLAG_WEIGHT_CLASSES)) {
+          this._removeFlag(this.FLAG_WEIGHT_CLASSES);
+        } else if (this._flagIsActive(this.FLAG_CLEAN_CONDITIONALLY)) {
+          this._removeFlag(this.FLAG_CLEAN_CONDITIONALLY);
+        } else {
+          return null;
+        }
+      } else {
+        if (lastTopCandidate !== null) {
+          // EXPERIMENTAL: Contrast ratio is how we measure the level of competition between candidates in the
+          // readability algorithm. This is to avoid offering reader mode on pages that are more like
+          // a list or directory of links with summaries. It takes the score of the last top candidate
+          // (see N_TOP_CANDIDATES) and checks how it compares to the top candidate's. On pages that are not
+          // actual articles, there will likely be many candidates with similar score (i.e. higher contrast ratio).
+          let contrastRatio = lastTopCandidate.readability.contentScore / topCandidate.readability.contentScore;
+          if (contrastRatio > 0.45)
+            return null;
+        }
+
+        return articleContent;
+      }
+    }
+  },
+
+  /**
+   * Attempts to get the excerpt from these
+   * sources in the following order:
+   * - meta description tag
+   * - open-graph description
+   * - twitter cards description
+   * - article's first paragraph
+   * If no excerpt is found, an empty string will be
+   * returned.
+   *
+   * @param Element - root element of the processed version page
+   * @return String - excerpt of the article
+  **/
+  _getExcerpt: function(articleContent) {
+    let values = {};
+    let metaElements = this._doc.getElementsByTagName("meta");
+
+    // Match "description", or Twitter's "twitter:description" (Cards)
+    // in name attribute.
+    let namePattern = /^\s*((twitter)\s*:\s*)?description\s*$/gi;
+
+    // Match Facebook's og:description (Open Graph) in property attribute.
+    let propertyPattern = /^\s*og\s*:\s*description\s*$/gi;
+
+    // Find description tags.
+    for (let i = 0; i < metaElements.length; i++) {
+      let element = metaElements[i];
+      let elementName = element.getAttribute("name");
+      let elementProperty = element.getAttribute("property");
+
+      let name;
+      if (namePattern.test(elementName)) {
+        name = elementName;
+      } else if (propertyPattern.test(elementProperty)) {
+        name = elementProperty;
+      }
+
+      if (name) {
+        let content = element.getAttribute("content");
+        if (content) {
+          // Convert to lowercase and remove any whitespace
+          // so we can match below.
+          name = name.toLowerCase().replace(/\s/g, '');
+          values[name] = content.trim();
+        }
+      }
+    }
+
+    if ("description" in values) {
+      return values["description"];
+    }
+
+    if ("og:description" in values) {
+      // Use facebook open graph description.
+      return values["og:description"];
+    }
+
+    if ("twitter:description" in values) {
+      // Use twitter cards description.
+      return values["twitter:description"];
+    }
+
+    // No description meta tags, use the article's first paragraph.
+    let paragraphs = articleContent.getElementsByTagName("p");
+    if (paragraphs.length > 0) {
+      return paragraphs[0].textContent;
+    }
+
+    return "";
+  },
+
+  /**
+   * Removes script tags from the document.
+   *
+   * @param Element
+  **/
+  _removeScripts: function(doc) {
+    let scripts = doc.getElementsByTagName('script');
+    for (let i = scripts.length - 1; i >= 0; i -= 1) {
+      scripts[i].nodeValue="";
+      scripts[i].removeAttribute('src');
+
+      if (scripts[i].parentNode)
+          scripts[i].parentNode.removeChild(scripts[i]);
+    }
+  },
+
+  /**
+   * Get child index of the only P element inside a DIV with no
+   * text content. Returns -1 if the DIV node contains non-empty
+   * text nodes or if it contains other element nodes.
+   *
+   * @param Element
+  **/
+  _getSinglePIndexInsideDiv: function(e) {
+    let childNodes = e.childNodes;
+    let pIndex = -1;
+
+    for (let i = childNodes.length; --i >= 0;) {
+      let node = childNodes[i];
+
+      if (node.nodeType === Node.ELEMENT_NODE) {
+        if (node.tagName !== "P")
+          return -1;
+
+        if (pIndex >= 0)
+          return -1;
+
+        pIndex = i;
+      } else if (node.nodeType == Node.TEXT_NODE && this._getInnerText(node, false)) {
+        return -1;
+      }
+    }
+
+    return pIndex;
+  },
+
+  /**
+   * Determine whether element has any children block level elements.
+   * 
+   * @param Element
+   */
+  _hasChildBlockElement: function (e) {
+    let length = e.childNodes.length;
+    for (let i = 0; i < length; i++) {
+      let child = e.childNodes[i];
+      if (child.nodeType != 1)
+        continue;
+
+      if (this.DIV_TO_P_ELEMS.indexOf(child.tagName) !== -1 || this._hasChildBlockElement(child))
+        return true;
+    }
+    return false;
+  },
+
+  /**
+   * Get the inner text of a node - cross browser compatibly.
+   * This also strips out any excess whitespace to be found.
+   *
+   * @param Element
+   * @return string
+  **/
+  _getInnerText: function(e, normalizeSpaces) {
+    let textContent = e.textContent.replace(this.REGEXPS.trim, "");
+    normalizeSpaces = (typeof normalizeSpaces === 'undefined') ? true : normalizeSpaces;
+
+    if (normalizeSpaces) {
+      return textContent.replace(this.REGEXPS.normalize, " ");
+    } else {
+      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) {
+    e = e || this._doc;
+    let cur = e.firstChild;
+
+    if (!e)
+      return;
+
+    // Remove any root styles, if we're able.
+    if (typeof e.removeAttribute === 'function' && e.className !== 'readability-styled')
+      e.removeAttribute('style');
+
+    // Go until there are no more child nodes
+    while (cur !== null) {
+      if (cur.nodeType === 1) {
+        // Remove style attribute(s) :
+        if (cur.className !== "readability-styled")
+          cur.removeAttribute("style");
+
+        this._cleanStyles(cur);
+      }
+
+      cur = cur.nextSibling;
+    }
+  },
+
+  /**
+   * 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(e) {
+    let links = e.getElementsByTagName("a");
+    let textLength = this._getInnerText(e).length;
+    let linkLength = 0;
+
+    for (let i = 0, il = links.length; i < il; i += 1) {
+      linkLength += this._getInnerText(links[i]).length;
+    }
+
+    return linkLength / textLength;
+  },
+
+  /**
+   * Find a cleaned up version of the current URL, to use for comparing links for possible next-pageyness.
+   *
+   * @author Dan Lacy
+   * @return string the base url
+  **/
+  _findBaseUrl: function() {
+    let uri = this._uri;
+    let noUrlParams = uri.path.split("?")[0];
+    let urlSlashes = noUrlParams.split("/").reverse();
+    let cleanedSegments = [];
+    let possibleType = "";
+
+    for (let i = 0, slashLen = urlSlashes.length; i < slashLen; i += 1) {
+      let segment = urlSlashes[i];
+
+      // Split off and save anything that looks like a file type.
+      if (segment.indexOf(".") !== -1) {
+        possibleType = segment.split(".")[1];
+
+        // If the type isn't alpha-only, it's probably not actually a file extension.
+        if (!possibleType.match(/[^a-zA-Z]/))
+          segment = segment.split(".")[0];
+      }
+
+      // EW-CMS specific segment replacement. Ugly.
+      // Example: http://www.ew.com/ew/article/0,,20313460_20369436,00.html
+      if (segment.indexOf(',00') !== -1)
+        segment = segment.replace(',00', '');
+
+      // If our first or second segment has anything looking like a page number, remove it.
+      if (segment.match(/((_|-)?p[a-z]*|(_|-))[0-9]{1,2}$/i) && ((i === 1) || (i === 0)))
+        segment = segment.replace(/((_|-)?p[a-z]*|(_|-))[0-9]{1,2}$/i, "");
+
+      let del = false;
+
+      // If this is purely a number, and it's the first or second segment,
+      // it's probably a page number. Remove it.
+      if (i < 2 && segment.match(/^\d{1,2}$/))
+        del = true;
+
+      // If this is the first segment and it's just "index", remove it.
+      if (i === 0 && segment.toLowerCase() === "index")
+        del = true;
+
+      // If our first or second segment is smaller than 3 characters,
+      // and the first segment was purely alphas, remove it.
+      if (i < 2 && segment.length < 3 && !urlSlashes[0].match(/[a-z]/i))
+        del = true;
+
+      // If it's not marked for deletion, push it to cleanedSegments.
+      if (!del)
+        cleanedSegments.push(segment);
+    }
+
+    // This is our final, cleaned, base article URL.
+    return uri.scheme + "://" + uri.host + cleanedSegments.reverse().join("/");
+  },
+
+  /**
+   * Look for any paging links that may occur within the document.
+   *
+   * @param body
+   * @return object (array)
+  **/
+  _findNextPageLink: function(elem) {
+    let uri = this._uri;
+    let possiblePages = {};
+    let allLinks = elem.getElementsByTagName('a');
+    let articleBaseUrl = this._findBaseUrl();
+
+    // Loop through all links, looking for hints that they may be next-page links.
+    // Things like having "page" in their textContent, className or id, or being a child
+    // of a node with a page-y className or id.
+    //
+    // Also possible: levenshtein distance? longest common subsequence?
+    //
+    // After we do that, assign each page a score, and
+    for (let i = 0, il = allLinks.length; i < il; i += 1) {
+      let link = allLinks[i];
+      let linkHref = allLinks[i].href.replace(/#.*$/, '').replace(/\/$/, '');
+
+      // If we've already seen this page, ignore it.
+      if (linkHref === "" ||
+        linkHref === articleBaseUrl ||
+        linkHref === uri.spec ||
+        linkHref in this._parsedPages) {
+        continue;
+      }
+
+      // If it's on a different domain, skip it.
+      if (uri.host !== linkHref.split(/\/+/g)[1])
+        continue;
+
+      let linkText = this._getInnerText(link);
+
+      // If the linkText looks like it's not the next page, skip it.
+      if (linkText.match(this.REGEXPS.extraneous) || linkText.length > 25)
+        continue;
+
+      // If the leftovers of the URL after removing the base URL don't contain
+      // any digits, it's certainly not a next page link.
+      let linkHrefLeftover = linkHref.replace(articleBaseUrl, '');
+      if (!linkHrefLeftover.match(/\d/))
+        continue;
+
+      if (!(linkHref in possiblePages)) {
+        possiblePages[linkHref] = {"score": 0, "linkText": linkText, "href": linkHref};
+      } else {
+        possiblePages[linkHref].linkText += ' | ' + linkText;
+      }
+
+      let linkObj = possiblePages[linkHref];
+
+      // If the articleBaseUrl isn't part of this URL, penalize this link. It could
+      // still be the link, but the odds are lower.
+      // Example: http://www.actionscript.org/resources/articles/745/1/JavaScript-and-VBScript-Injection-in-ActionScript-3/Page1.html
+      if (linkHref.indexOf(articleBaseUrl) !== 0)
+        linkObj.score -= 25;
+
+      let linkData = linkText + ' ' + link.className + ' ' + link.id;
+      if (linkData.match(this.REGEXPS.nextLink))
+        linkObj.score += 50;
+
+      if (linkData.match(/pag(e|ing|inat)/i))
+        linkObj.score += 25;
+
+      if (linkData.match(/(first|last)/i)) {
+        // -65 is enough to negate any bonuses gotten from a > or » in the text,
+        // If we already matched on "next", last is probably fine.
+        // If we didn't, then it's bad. Penalize.
+        if (!linkObj.linkText.match(this.REGEXPS.nextLink))
+          linkObj.score -= 65;
+      }
+
+      if (linkData.match(this.REGEXPS.negative) || linkData.match(this.REGEXPS.extraneous))
+        linkObj.score -= 50;
+
+      if (linkData.match(this.REGEXPS.prevLink))
+        linkObj.score -= 200;
+
+      // If a parentNode contains page or paging or paginat
+      let parentNode = link.parentNode;
+      let positiveNodeMatch = false;
+      let negativeNodeMatch = false;
+
+      while (parentNode) {
+        let parentNodeClassAndId = parentNode.className + ' ' + parentNode.id;
+
+        if (!positiveNodeMatch && parentNodeClassAndId && parentNodeClassAndId.match(/pag(e|ing|inat)/i)) {
+          positiveNodeMatch = true;
+          linkObj.score += 25;
+        }
+
+        if (!negativeNodeMatch && parentNodeClassAndId && parentNodeClassAndId.match(this.REGEXPS.negative)) {
+          // If this is just something like "footer", give it a negative.
+          // If it's something like "body-and-footer", leave it be.
+          if (!parentNodeClassAndId.match(this.REGEXPS.positive)) {
+            linkObj.score -= 25;
+            negativeNodeMatch = true;
+          }
+        }
+
+        parentNode = parentNode.parentNode;
+      }
+
+      // If the URL looks like it has paging in it, add to the score.
+      // Things like /page/2/, /pagenum/2, ?p=3, ?page=11, ?pagination=34
+      if (linkHref.match(/p(a|g|ag)?(e|ing|ination)?(=|\/)[0-9]{1,2}/i) || linkHref.match(/(page|paging)/i))
+        linkObj.score += 25;
+
+      // If the URL contains negative values, give a slight decrease.
+      if (linkHref.match(this.REGEXPS.extraneous))
+        linkObj.score -= 15;
+
+      /**
+       * Minor punishment to anything that doesn't match our current URL.
+       * NOTE: I'm finding this to cause more harm than good where something is exactly 50 points.
+       *     Dan, can you show me a counterexample where this is necessary?
+       * if (linkHref.indexOf(window.location.href) !== 0) {
+       *  linkObj.score -= 1;
+       * }
+      **/
+
+      // If the link text can be parsed as a number, give it a minor bonus, with a slight
+      // bias towards lower numbered pages. This is so that pages that might not have 'next'
+      // in their text can still get scored, and sorted properly by score.
+      let linkTextAsNumber = parseInt(linkText, 10);
+      if (linkTextAsNumber) {
+        // Punish 1 since we're either already there, or it's probably
+        // before what we want anyways.
+        if (linkTextAsNumber === 1) {
+          linkObj.score -= 10;
+        } else {
+          linkObj.score += Math.max(0, 10 - linkTextAsNumber);
+        }
+      }
+    }
+
+    // Loop thrugh all of our possible pages from above and find our top
+    // candidate for the next page URL. Require at least a score of 50, which
+    // is a relatively high confidence that this page is the next link.
+    let topPage = null;
+    for (let page in possiblePages) {
+      if (possiblePages.hasOwnProperty(page)) {
+        if (possiblePages[page].score >= 50 &&
+          (!topPage || topPage.score < possiblePages[page].score))
+          topPage = possiblePages[page];
+      }
+    }
+
+    if (topPage) {
+      let nextHref = topPage.href.replace(/\/$/,'');
+
+      this.log('NEXT PAGE IS ' + nextHref);
+      this._parsedPages[nextHref] = true;
+      return nextHref;
+    } else {
+      return null;
+    }
+  },
+
+  _successfulRequest: function(request) {
+    return (request.status >= 200 && request.status < 300) ||
+        request.status === 304 ||
+         (request.status === 0 && request.responseText);
+  },
+
+  _ajax: function(url, options) {
+    let request = new XMLHttpRequest();
+
+    function respondToReadyState(readyState) {
+      if (request.readyState === 4) {
+        if (this._successfulRequest(request)) {
+          if (options.success)
+            options.success(request);
+        } else {
+          if (options.error)
+            options.error(request);
+        }
+      }
+    }
+
+    if (typeof options === 'undefined')
+      options = {};
+
+    request.onreadystatechange = respondToReadyState;
+
+    request.open('get', url, true);
+    request.setRequestHeader('Accept', 'text/html');
+
+    try {
+      request.send(options.postBody);
+    } catch (e) {
+      if (options.error)
+        options.error();
+    }
+
+    return request;
+  },
+
+  _appendNextPage: function(nextPageLink) {
+    let doc = this._doc;
+    this._curPageNum += 1;
+
+    let articlePage = doc.createElement("DIV");
+    articlePage.id = 'readability-page-' + this._curPageNum;
+    articlePage.className = 'page';
+    articlePage.innerHTML = '<p class="page-separator" title="Page ' + this._curPageNum + '">&sect;</p>';
+
+    doc.getElementById("readability-content").appendChild(articlePage);
+
+    if (this._curPageNum > this.MAX_PAGES) {
+      let nextPageMarkup = "<div style='text-align: center'><a href='" + nextPageLink + "'>View Next Page</a></div>";
+      articlePage.innerHTML = articlePage.innerHTML + nextPageMarkup;
+      return;
+    }
+
+    // Now that we've built the article page DOM element, get the page content
+    // asynchronously and load the cleaned content into the div we created for it.
+    (function(pageUrl, thisPage) {
+      this._ajax(pageUrl, {
+        success: function(r) {
+
+          // First, check to see if we have a matching ETag in headers - if we do, this is a duplicate page.
+          let eTag = r.getResponseHeader('ETag');
+          if (eTag) {
+            if (eTag in this._pageETags) {
+              this.log("Exact duplicate page found via ETag. Aborting.");
+              articlePage.style.display = 'none';
+              return;
+            } else {
+              this._pageETags[eTag] = 1;
+            }
+          }
+
+          // TODO: this ends up doubling up page numbers on NYTimes articles. Need to generically parse those away.
+          let page = doc.createElement("DIV");
+
+          // Do some preprocessing to our HTML to make it ready for appending.
+          // - Remove any script tags. Swap and reswap newlines with a unicode
+          //   character because multiline regex doesn't work in javascript.
+          // - Turn any noscript tags into divs so that we can parse them. This
+          //   allows us to find any next page links hidden via javascript.
+          // - Turn all double br's into p's - was handled by prepDocument in the original view.
+          //   Maybe in the future abstract out prepDocument to work for both the original document
+          //   and AJAX-added pages.
+          let responseHtml = r.responseText.replace(/\n/g,'\uffff').replace(/<script.*?>.*?<\/script>/gi, '');
+          responseHtml = responseHtml.replace(/\n/g,'\uffff').replace(/<script.*?>.*?<\/script>/gi, '');
+          responseHtml = responseHtml.replace(/\uffff/g,'\n').replace(/<(\/?)noscript/gi, '<$1div');
+          responseHtml = responseHtml.replace(this.REGEXPS.replaceFonts, '<$1span>');
+
+          page.innerHTML = responseHtml;
+          this._replaceBrs(page);
+
+          // Reset all flags for the next page, as they will search through it and
+          // disable as necessary at the end of grabArticle.
+          this._flags = 0x1 | 0x2 | 0x4;
+
+          let nextPageLink = this._findNextPageLink(page);
+          
+          // NOTE: if we end up supporting _appendNextPage(), we'll need to
+          // change this call to be async
+          let content = this._grabArticle(page);
+
+          if (!content) {
+            this.log("No content found in page to append. Aborting.");
+            return;
+          }
+
+          // Anti-duplicate mechanism. Essentially, get the first paragraph of our new page.
+          // Compare it against all of the the previous document's we've gotten. If the previous
+          // document contains exactly the innerHTML of this first paragraph, it's probably a duplicate.
+          let firstP = content.getElementsByTagName("P").length ? content.getElementsByTagName("P")[0] : null;
+          if (firstP && firstP.innerHTML.length > 100) {
+            for (let i = 1; i <= this._curPageNum; i += 1) {
+              let rPage = doc.getElementById('readability-page-' + i);
+              if (rPage && rPage.innerHTML.indexOf(firstP.innerHTML) !== -1) {
+                this.log('Duplicate of page ' + i + ' - skipping.');
+                articlePage.style.display = 'none';
+                this._parsedPages[pageUrl] = true;
+                return;
+              }
+            }
+          }
+
+          this._removeScripts(content);
+
+          thisPage.innerHTML = thisPage.innerHTML + content.innerHTML;
+
+          // After the page has rendered, post process the content. This delay is necessary because,
+          // in webkit at least, offsetWidth is not set in time to determine image width. We have to
+          // wait a little bit for reflow to finish before we can fix floating images.
+          setTimeout((function() {
+            this._postProcessContent(thisPage);
+          }).bind(this), 500);
+
+
+          if (nextPageLink)
+            this._appendNextPage(nextPageLink);
+        }
+      });
+    }).bind(this)(nextPageLink, articlePage);
+  },
+
+  /**
+   * 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;
+
+    let weight = 0;
+
+    // Look for a special classname
+    if (typeof(e.className) === 'string' && e.className !== '') {
+      if (e.className.search(this.REGEXPS.negative) !== -1)
+        weight -= 25;
+
+      if (e.className.search(this.REGEXPS.positive) !== -1)
+        weight += 25;
+    }
+
+    // Look for a special ID
+    if (typeof(e.id) === 'string' && e.id !== '') {
+      if (e.id.search(this.REGEXPS.negative) !== -1)
+        weight -= 25;
+
+      if (e.id.search(this.REGEXPS.positive) !== -1)
+        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) {
+    let targetList = e.getElementsByTagName(tag);
+    let isEmbed = (tag === 'object' || tag === 'embed');
+
+    for (let y = targetList.length - 1; y >= 0; y -= 1) {
+      // Allow youtube and vimeo videos through as people usually want to see those.
+      if (isEmbed) {
+        let attributeValues = "";
+        for (let i = 0, il = targetList[y].attributes.length; i < il; i += 1) {
+          attributeValues += targetList[y].attributes[i].value + '|';
+        }
+
+        // First, check the elements attributes to see if any of them contain youtube or vimeo
+        if (attributeValues.search(this.REGEXPS.videos) !== -1)
+          continue;
+
+        // Then check the elements inside this element for the same.
+        if (targetList[y].innerHTML.search(this.REGEXPS.videos) !== -1)
+          continue;
+      }
+
+      targetList[y].parentNode.removeChild(targetList[y]);
+    }
+  },
+
+  /**
+   * 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;
+
+    let tagsList = e.getElementsByTagName(tag);
+    let curTagsLength = tagsList.length;
+
+    // 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.
+    for (let i = curTagsLength-1; i >= 0; i -= 1) {
+      let weight = this._getClassWeight(tagsList[i]);
+      let contentScore = 0;
+
+      this.log("Cleaning Conditionally " + tagsList[i] + " (" + tagsList[i].className + ":" + tagsList[i].id + ")");
+
+      if (weight + contentScore < 0) {
+        tagsList[i].parentNode.removeChild(tagsList[i]);
+      } else if (this._getCharCount(tagsList[i],',') < 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.
+        let p = tagsList[i].getElementsByTagName("p").length;
+        let img = tagsList[i].getElementsByTagName("img").length;
+        let li = tagsList[i].getElementsByTagName("li").length-100;
+        let input = tagsList[i].getElementsByTagName("input").length;
+
+        let embedCount = 0;
+        let embeds = tagsList[i].getElementsByTagName("embed");
+        for (let ei = 0, il = embeds.length; ei < il; ei += 1) {
+          if (embeds[ei].src.search(this.REGEXPS.videos) === -1)
+            embedCount += 1;
+        }
+
+        let linkDensity = this._getLinkDensity(tagsList[i]);
+        let contentLength = this._getInnerText(tagsList[i]).length;
+        let toRemove = false;
+
+        if (img > p) {
+          toRemove = true;
+        } else if (li > p && tag !== "ul" && tag !== "ol") {
+          toRemove = true;
+        } else if ( input > Math.floor(p/3) ) {
+          toRemove = true;
+        } else if (contentLength < 25 && (img === 0 || img > 2) ) {
+          toRemove = true;
+        } else if (weight < 25 && linkDensity > 0.2) {
+          toRemove = true;
+        } else if (weight >= 25 && linkDensity > 0.5) {
+          toRemove = true;
+        } else if ((embedCount === 1 && contentLength < 75) || embedCount > 1) {
+          toRemove = true;
+        }
+
+        if (toRemove)
+          tagsList[i].parentNode.removeChild(tagsList[i]);
+      }
+    }
+  },
+
+  /**
+   * Clean out spurious headers from an Element. Checks things like classnames and link density.
+   *
+   * @param Element
+   * @return void
+  **/
+  _cleanHeaders: function(e) {
+    for (let headerIndex = 1; headerIndex < 3; headerIndex += 1) {
+      let headers = e.getElementsByTagName('h' + headerIndex);
+      for (let i = headers.length - 1; i >= 0; i -= 1) {
+        if (this._getClassWeight(headers[i]) < 0 || this._getLinkDensity(headers[i]) > 0.33)
+          headers[i].parentNode.removeChild(headers[i]);
+      }
+    }
+  },
+
+  _flagIsActive: function(flag) {
+    return (this._flags & flag) > 0;
+  },
+
+  _addFlag: function(flag) {
+    this._flags = this._flags | flag;
+  },
+
+  _removeFlag: function(flag) {
+    this._flags = this._flags & ~flag;
+  },
+
+  /**
+   * 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 () {
+    // Remove script tags from the document.
+    this._removeScripts(this._doc);
+
+    // FIXME: Disabled multi-page article support for now as it
+    // needs more work on infrastructure.
+
+    // Make sure this document is added to the list of parsed pages first,
+    // so we don't double up on the first page.
+    // this._parsedPages[uri.spec.replace(/\/$/, '')] = true;
+
+    // Pull out any possible next page link first.
+    // let nextPageLink = this._findNextPageLink(doc.body);
+
+    this._prepDocument();
+
+    let articleTitle = this._getArticleTitle();
+    let articleContent = this._grabArticle();
+    if (!articleContent)
+      return null;
+
+    this._postProcessContent(articleContent);
+
+    // if (nextPageLink) {
+    //   // Append any additional pages after a small timeout so that people
+    //   // can start reading without having to wait for this to finish processing.
+    //   setTimeout((function() {
+    //     this._appendNextPage(nextPageLink);
+    //   }).bind(this), 500);
+    // }
+
+    let excerpt = this._getExcerpt(articleContent);
+
+    return { title: articleTitle,
+             byline: this._articleByline,
+             dir: this._articleDir,
+             content: articleContent.innerHTML,
+             length: articleContent.textContent.length,
+             excerpt: excerpt };
+  }
+};