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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)

);
  });
  it('should have a this value of undefined if bind is not used', () => {
    expect.assertions(1);
    const unboundInputOnChange = function() {
      expect(this).toBe(undefined);
    };
    const stub = <input type="text" onChange={unboundInputOnChange} />;
    const node = ReactDOM.render(stub, container);
    setUntrackedValue.call(node, 'giraffe');
    dispatchEventOnNode(node, 'input');
  });
  it('should update defaultValue to empty string', () => {
    ReactDOM.render(<input type="text" defaultValue={'foo'} />, container);
    ReactDOM.render(<input type="text" defaultValue={''} />, container);
    expect(container.firstChild.defaultValue).toBe('');
  });
  it('should warn if value is null', () => {
    expect(() =>
      ReactDOM.render(<input type="text" value={null} />, container),
    ).toWarnDev(
      '`value` prop on `input` should not be null. ' +
        'Consider using an empty string to clear the component or `undefined` ' +
        'for uncontrolled components.',
    );
    ReactDOM.unmountComponentAtNode(container);
    ReactDOM.render(<input type="text" value={null} />, container);
  });
  it('should warn if checked and defaultChecked props are specified', () => {
    expect(() =>