code: function(element) {
      // There should be exactly 1 element child which is a P:
      if (element.children.length != 1 || element.children[0].tagName !== "P") {
        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);
      });
    }
docs: Check if this node has only whitespace and a single P element
  Returns false if the DIV node contains non-empty text nodes
  or if it contains no P or more than 1 element.
  
  @param Element