**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.

},
          set: function(val) {
            value = '' + val;
            log.push(`node.value = ${strify(val)}`);
          },
        });
        spyOnDevAndProd(el, 'setAttribute').and.callFake(function(name, val) {
          log.push(`node.setAttribute(${strify(name)}, ${strify(val)})`);
        });
      }
      return el;
    });
    ReactDOM.render(<input type="date" defaultValue="1980-01-01" />, container);
    expect(log).toEqual([
      'node.setAttribute("type", "date")',
      'node.value = "1980-01-01"',
      'node.setAttribute("value", "1980-01-01")',
      'node.setAttribute("checked", "")',
    ]);
  });
  describe('assigning the value attribute on controlled inputs', function() {
    function getTestInput() {
      return class extends React.Component {
        state = {
          value: this.props.value == null ? '' : this.props.value,
        };
        onChange = event => {
          this.setState({value: event.target.value});
        };
        render() {