**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.

/>
          );
        }
      }
      const stub = ReactDOM.render(<Input />, container);
      input = ReactDOM.findDOMNode(stub);
      setUntrackedValue.call(input, 'latest');
      dispatchEventOnNode(input, 'input');
      setValueToUndefined();
    }
    it('reverts the value attribute to the initial value', () => {
      expect(renderInputWithStringThenWithUndefined).toWarnDev(
        'Input elements should not switch from controlled to ' +
          'uncontrolled (or vice versa).',
      );
      expect(input.getAttribute('value')).toBe('first');
    });
    it('preserves the value property', () => {
      expect(renderInputWithStringThenWithUndefined).toWarnDev(
        'Input elements should not switch from controlled to ' +
          'uncontrolled (or vice versa).',
      );
      expect(input.value).toBe('latest');
    });
  });
  describe('setting a controlled input to null', () => {
    let input;
    function renderInputWithStringThenWithNull() {
      let setValueToNull;
      class Input extends React.Component {