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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)

},
    });
    component.forceUpdate();
  });
  it('should display "true" for `defaultValue` of `true`', () => {
    let stub = <input type="text" defaultValue={true} />;
    const node = ReactDOM.render(stub, container);
    expect(node.value).toBe('true');
  });
  it('should display "false" for `defaultValue` of `false`', () => {
    let stub = <input type="text" defaultValue={false} />;
    const node = ReactDOM.render(stub, container);
    expect(node.value).toBe('false');
  });
  it('should update `defaultValue` for uncontrolled input', () => {
    const node = ReactDOM.render(
      <input type="text" defaultValue="0" />,
      container,
    );
    expect(node.value).toBe('0');
    ReactDOM.render(<input type="text" defaultValue="1" />, container);
    expect(node.value).toBe('0');
    expect(node.defaultValue).toBe('1');
  });
  it('should update `defaultValue` for uncontrolled date/time input', () => {
    const node = ReactDOM.render(
      <input type="date" defaultValue="1980-01-01" />,
      container,
    );
    expect(node.value).toBe('1980-01-01');