function () {
      var c = this.nextChar();

      if (c === undefined)
        return null;

      // Read any text as Text node
      if (c !== "<") {
        --this.currentChar;
        var textNode = new Text();
        var n = this.html.indexOf("<", this.currentChar);
        if (n === -1) {
          textNode.innerHTML = this.html.substring(this.currentChar, this.html.length);
          this.currentChar = this.html.length;
        } else {
          textNode.innerHTML = this.html.substring(this.currentChar, n);
          this.currentChar = n;
        }
        return textNode;
      }

      c = this.peekNext();

      // Read Comment node. Normally, Comment nodes know their inner
      // textContent, but we don't really care about Comment nodes (we throw
      // them away in readChildren()). So just returning an empty Comment node
      // here is sufficient.
      if (c === "!" || c === "?") {
        // We're still before the ! or ? that is starting this comment:
        this.currentChar++;
        return this.discardNextComment();
      }

      // If we're reading a closing tag, return null. This means we've reached
      // the end of this set of child nodes.
      if (c === "/") {
        --this.currentChar;
        return null;
      }

      // Otherwise, we're looking at an Element node
      var result = this.makeElementNode(this.retPair);
      if (!result)
        return null;

      var node = this.retPair[0];
      var closed = this.retPair[1];
      var localName = node.localName;

      // If this isn't a void Element, read its child nodes
      if (!closed) {
        this.readChildren(node);
        var closingTag = "</" + localName + ">";
        if (!this.match(closingTag)) {
          this.error("expected '" + closingTag + "' and got " + this.html.substr(this.currentChar, closingTag.length));
          return null;
        }
      }

      // Only use the first title, because SVG might have other
      // title elements which we don't care about (medium.com
      // does this, at least).
      if (localName === "title" && !this.doc.title) {
        this.doc.title = node.textContent.trim();
      } else if (localName === "head") {
        this.doc.head = node;
      } else if (localName === "body") {
        this.doc.body = node;
      } else if (localName === "html") {
        this.doc.documentElement = node;
      }

      return node;
    }
function () {
      var c = this.nextChar();

      if (c === undefined)
        return null;

      // Read any text as Text node
      if (c !== "<") {
        --this.currentChar;
        var textNode = new Text();
        var n = this.html.indexOf("<", this.currentChar);
        if (n === -1) {
          textNode.innerHTML = this.html.substring(this.currentChar, this.html.length);
          this.currentChar = this.html.length;
        } else {
          textNode.innerHTML = this.html.substring(this.currentChar, n);
          this.currentChar = n;
        }
        return textNode;
      }

      c = this.peekNext();

      // Read Comment node. Normally, Comment nodes know their inner
      // textContent, but we don't really care about Comment nodes (we throw
      // them away in readChildren()). So just returning an empty Comment node
      // here is sufficient.
      if (c === "!" || c === "?") {
        // We're still before the ! or ? that is starting this comment:
        this.currentChar++;
        return this.discardNextComment();
      }

      // If we're reading a closing tag, return null. This means we've reached
      // the end of this set of child nodes.
      if (c === "/") {
        --this.currentChar;
        return null;
      }

      // Otherwise, we're looking at an Element node
      var result = this.makeElementNode(this.retPair);
      if (!result)
        return null;

      var node = this.retPair[0];
      var closed = this.retPair[1];
      var localName = node.localName;

      // If this isn't a void Element, read its child nodes
      if (!closed) {
        this.readChildren(node);
        var closingTag = "</" + localName + ">";
        if (!this.match(closingTag)) {
          this.error("expected '" + closingTag + "' and got " + this.html.substr(this.currentChar, closingTag.length));
          return null;
        }
      }

      // Only use the first title, because SVG might have other
      // title elements which we don't care about (medium.com
      // does this, at least).
      if (localName === "title" && !this.doc.title) {
        this.doc.title = node.textContent.trim();
      } else if (localName === "head") {
        this.doc.head = node;
      } else if (localName === "body") {
        this.doc.body = node;
      } else if (localName === "html") {
        this.doc.documentElement = node;
      }

      return node;
    }
function ( ) { var c = this . nextChar ( ) ; if ( c === undefined ) return null ; // Read any text as Text node if ( c !== "<" ) { -- this . currentChar ; var textNode = new Text ( ) ; var n = this . html . indexOf ( "<" , this . currentChar ) ; if ( n === - 1 ) { textNode . innerHTML = this . html . substring ( this . currentChar , this . html . length ) ; this . currentChar = this . html . length ; } else { textNode . innerHTML = this . html . substring ( this . currentChar , n ) ; this . currentChar = n ; } return textNode ; } c = this . peekNext ( ) ; // Read Comment node. Normally, Comment nodes know their inner // textContent, but we don't really care about Comment nodes (we throw // them away in readChildren()). So just returning an empty Comment node // here is sufficient. if ( c === "!" || c === "?" ) { // We're still before the ! or ? that is starting this comment: this . currentChar ++ ; return this . discardNextComment ( ) ; } // If we're reading a closing tag, return null. This means we've reached // the end of this set of child nodes. if ( c === "/" ) { -- this . currentChar ; return null ; } // Otherwise, we're looking at an Element node var result = this . makeElementNode ( this . retPair ) ; if ( ! result ) return null ; var node = this . retPair [ 0 ] ; var closed = this . retPair [ 1 ] ; var localName = node . localName ; // If this isn't a void Element, read its child nodes if ( ! closed ) { this . readChildren ( node ) ; var closingTag = "</" + localName + ">" ; if ( ! this . match ( closingTag ) ) { this . error ( "expected '" + closingTag + "' and got " + this . html . substr ( this . currentChar , closingTag . length ) ) ; return null ; } } // Only use the first title, because SVG might have other // title elements which we don't care about (medium.com // does this, at least). if ( localName === "title" && ! this . doc . title ) { this . doc . title = node . textContent . trim ( ) ; } else if ( localName === "head" ) { this . doc . head = node ; } else if ( localName === "body" ) { this . doc . body = node ; } else if ( localName === "html" ) { this . doc . documentElement = node ; } return node ; }
Reads the next child node from the input. If we're reading a closing
tag, or if we've reached the end of input, return null.

@returns the node
Reads the next child node from the input . If we re reading a closing tag or if we ve reached the end of input return null .
Reads a node from the current character.