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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)

/>
          );
        }
      }
      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 {