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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 node = container.firstChild;
    expect(node.value).toBe('0');
    expect(node.defaultValue).toBe('0');
  });
  it('should have the correct target value', () => {
    let handled = false;
    const handler = function(event) {
      expect(event.target.nodeName).toBe('INPUT');
      handled = true;
    };
    const stub = <input type="text" value={0} onChange={handler} />;
    const node = ReactDOM.render(stub, container);
    setUntrackedValue.call(node, 'giraffe');
    dispatchEventOnNode(node, 'input');
    expect(handled).toBe(true);
  });
  it('should not set a value for submit buttons unnecessarily', () => {
    const stub = <input type="submit" />;
    const node = ReactDOM.render(stub, container);
    
    
    
    
    expect(
      !node.hasAttribute('value') || node.getAttribute('value').length > 0,
    ).toBe(true);
  });
  it('should control radio buttons', () => {
    class RadioGroup extends React.Component {