code: function createElement(nodeName, ownerDocument, data){
      if (!ownerDocument) {
          ownerDocument = document;
      }
      if(supportsUnknownElements){
          return ownerDocument.createElement(nodeName);
      }
      if (!data) {
          data = getExpandoData(ownerDocument);
      }
      var node;
  
      if (data.cache[nodeName]) {
          node = data.cache[nodeName].cloneNode();
      } else if (saveClones.test(nodeName)) {
          node = (data.cache[nodeName] = data.createElem(nodeName)).cloneNode();
      } else {
          node = data.createElem(nodeName);
      }
  
      // Avoid adding some elements to fragments in IE < 9 because
      // * Attributes like `name` or `type` cannot be set/changed once an element
      //   is inserted into a document/fragment
      // * Link elements with `src` attributes that are inaccessible, as with
      //   a 403 response, will cause the tab/window to crash
      // * Script elements appended to fragments will execute when their `src`
      //   or `text` property is set
      return node.canHaveChildren && !reSkip.test(nodeName) && !node.tagUrn ? data.frag.appendChild(node) : node;
    }
docs: returns a shived element for the given nodeName and document
  @memberOf html5
  @param {String} nodeName name of the element
  @param {Document} ownerDocument The context document.
  @returns {Object} The shived element.