diff --git a/assets/support/support.js b/assets/support/support.js
index 6605470..d8beb05 100644
--- a/assets/support/support.js
+++ b/assets/support/support.js
@@ -200,7 +200,34 @@ __PluginManager__.register('support', function(module, exports, require, global)
         }
         return true;
     }
-
+    function insertAfter(newNode, referenceNode) {
+        referenceNode.parentNode.insertBefore(newNode, referenceNode.nextSibling);
+    }
+    function tagName(node, tagName) {
+        if(!tagName) {
+            return null;
+        }
+        node = getNode(node);
+        if(!isNode(node)) {
+            return null;
+        }
+        if(node.tagName.toUpperCase() === tagName.toUpperCase()) {
+            return node;
+        }
+        var result = document.createElement(tagName);
+        var childNodes = [].slice.call(node.childNodes);
+        for (var i = 0; i < [].slice.call(childNodes).length; i++) {
+            result.appendChild(childNodes[i]);
+        }
+        node.getAttributeNames().forEach(function (attrName) {
+            result.setAttribute(attrName, node.getAttribute(attrName))
+        });
+        if(node.parentNode){
+            node.parentNode.insertBefore(result, node.nextSibling);
+            node.remove();
+        }
+        return result;
+    }
 
     /**
      * @memberOf kit
@@ -230,7 +257,8 @@ __PluginManager__.register('support', function(module, exports, require, global)
         definePropertyGet,
         args2array,
         innerHtml,
-        makeNodeList
+        makeNodeList,
+        tagName
     };
 
     return module.exports = support;