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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)

type="radio"
              name={radioName}
              onChange={emptyFunction}
              checked={updated === true}
            />
            <input
              type="radio"
              name={radioName}
              onChange={emptyFunction}
              checked={updated === false}
            />
          </div>
        );
      }
    }
    const stub = ReactDOM.render(<App />, container);
    const buttonNode = ReactDOM.findDOMNode(stub).childNodes[0];
    const firstRadioNode = ReactDOM.findDOMNode(stub).childNodes[1];
    expect(firstRadioNode.checked).toBe(false);
    dispatchEventOnNode(buttonNode, 'click');
    expect(firstRadioNode.checked).toBe(true);
  });
  it('should control radio buttons if the tree updates during render', () => {
    const sharedParent = container;
    const container1 = document.createElement('div');
    const container2 = document.createElement('div');
    sharedParent.appendChild(container1);
    let aNode;
    let bNode;
    class ComponentA extends React.Component {