Use this.getDOMNode() instead of last argument of componentDidMount

src/addons/transitions/ReactTransitionableChild.js

@@ -132,7 +132,7 @@ var ReactTransitionableChild = React.createClass({
     }
   },
 
-  componentDidMount: function(node) {
+  componentDidMount: function() {
     if (this.props.enter) {
       this.transition('enter');
     }

src/core/__tests__/ReactDOM-test.js

@@ -46,8 +46,8 @@ describe('ReactDOM', function() {
       render: function() {
         return <form><input type="submit" value="Submit" /></form>;
       },
-      componentDidMount: function(node) {
-        form = node;
+      componentDidMount: function() {
+        form = this.getDOMNode();
       }
     });
     var instance = ReactTestUtils.renderIntoDocument(<Parent />);

src/dom/components/ReactDOMForm.js

@@ -40,11 +40,11 @@ var ReactDOMForm = ReactCompositeComponent.createClass({
     return this.transferPropsTo(form(null, this.props.children));
   },
 
-  componentDidMount: function(node) {
+  componentDidMount: function() {
     ReactEventEmitter.trapBubbledEvent(
       EventConstants.topLevelTypes.topSubmit,
       'submit',
-      node
+      this.getDOMNode()
     );
   }
 });

src/dom/components/ReactDOMInput.js

@@ -81,8 +81,8 @@ var ReactDOMInput = ReactCompositeComponent.createClass({
     return input(props, this.props.children);
   },
 
-  componentDidMount: function(rootNode) {
-    var id = ReactMount.getID(rootNode);
+  componentDidMount: function() {
+    var id = ReactMount.getID(this.getDOMNode());
     instancesByReactID[id] = this;
   },