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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)

container,
      );
      const node = ReactDOM.findDOMNode(stub);
      setUntrackedValue.call(node, '2');
      dispatchEventOnNode(node, 'input');
      dispatchEventOnNode(node, 'blur');
      expect(node.getAttribute('value')).toBe('2');
    });
    it('an uncontrolled number input will not update the value attribute on blur', () => {
      const node = ReactDOM.render(
        <input type="number" defaultValue="1" />,
        container,
      );
      setUntrackedValue.call(node, 4);
      dispatchEventOnNode(node, 'blur');
      expect(node.getAttribute('value')).toBe('1');
    });
    it('an uncontrolled text input will not update the value attribute on blur', () => {
      const node = ReactDOM.render(
        <input type="text" defaultValue="1" />,
        container,
      );
      setUntrackedValue.call(node, 4);
      dispatchEventOnNode(node, 'blur');
      expect(node.getAttribute('value')).toBe('1');
    });
  });
  describe('setting a controlled input to undefined', () => {
    let input;
    function renderInputWithStringThenWithUndefined() {