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**Do you want to request a *feature* or report a *bug*?**

Bug.

**What is the current behavior?**

Creating an `<input type='submit'` with `value={undefined}` results in a button with no text. https://codesandbox.io/s/nn7p94y3rl

The same behaviour can be seen with `type='reset'`

I have a PR open with a proposed fix. https://github.com/facebook/react/pull/12780

**What is the expected behavior?**

The input should use the browser's default value for the input (Submit for en, etc.).

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

React 16.3.2. Chrome 66.0.3359.139. macOS 10.13.4. Works in React 15 (unsure of earlier versions)

},
          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() {