**Do you want to request a _feature_ or report a _bug_?**

This is a bug

**What is the current behavior?**

![screen shot 2016-07-03 at 4 12 19 pm](https://cloud.githubusercontent.com/assets/1697380/16544656/b3f896b2-4140-11e6-923a-06fc630c92df.png)
![screen shot 2016-07-03 at 4 11 15 pm](https://cloud.githubusercontent.com/assets/1697380/16544657/b3f8f292-4140-11e6-8b03-0ecaa3165460.png)

**If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem via https://jsfiddle.net or similar (template: https://jsfiddle.net/reactjs/69z2wepo/).**

Using 15.2.0 react and react-dom

**What is the expected behavior?**

![screen shot 2016-07-03 at 4 13 05 pm](https://cloud.githubusercontent.com/assets/1697380/16544659/b938951e-4140-11e6-9275-2c3721542003.png)
![screen shot 2016-07-03 at 4 13 10 pm](https://cloud.githubusercontent.com/assets/1697380/16544660/b9391278-4140-11e6-9951-0f81024ce859.png)

**Which versions of React, and which browser / OS are affected by this issue? Did this work in previous versions of React?**

In 15.2.0, extra attributes `name` and `value` with empty values are added to the submit button of a form.

It works in 15.1.0.

return (
          <div>
            <input
              type="text"
              ref={n => (this.a = n)}
              value={this.state.value}
              onChange={e => this.change(e.target.value)}
              onBlur={e => this.blur(e.target.value)}
            />
            <input type="text" ref={n => (this.b = n)} />
          </div>
        );
      }
    }
    const instance = ReactDOM.render(<ControlledInputs />, container);
    
    
    instance.a.focus();
    setUntrackedValue.call(instance.a, 'giraffe');
    
    
    dispatchEventOnNode(instance.a, 'input');
    dispatchEventOnNode(instance.a, 'blur');
    expect(instance.a.value).toBe('giraffe');
    expect(instance.switchedFocus).toBe(true);
  });
  it('should control values in reentrant events with different targets', () => {
    class ControlledInputs extends React.Component {