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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)

</div>
        );
      }
    }
    const stub = ReactDOM.render(<RadioGroup />, container);
    const aNode = stub.refs.a;
    const bNode = stub.refs.b;
    const cNode = stub.refs.c;
    expect(aNode.checked).toBe(true);
    expect(aNode.hasAttribute('checked')).toBe(true);
    expect(bNode.checked).toBe(false);
    expect(bNode.hasAttribute('checked')).toBe(false);
    
    expect(cNode.checked).toBe(true);
    expect(cNode.hasAttribute('checked')).toBe(true);
    setUntrackedChecked.call(bNode, true);
    expect(aNode.checked).toBe(false);
    expect(cNode.checked).toBe(true);
    
    expect(aNode.hasAttribute('checked')).toBe(true);
    expect(bNode.hasAttribute('checked')).toBe(false);
    expect(cNode.hasAttribute('checked')).toBe(true);
    
    dispatchEventOnNode(bNode, 'click');
    
    expect(aNode.checked).toBe(true);
    expect(cNode.checked).toBe(true);
  });
  it('should check the correct radio when the selected name moves', () => {
    class App extends React.Component {