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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 type = this.props.type;
          const value = this.state.value;
          return <input type={type} value={value} onChange={this.onChange} />;
        }
      };
    }
    it('always sets the attribute when values change on text inputs', function() {
      const Input = getTestInput();
      const stub = ReactDOM.render(<Input type="text" />, container);
      const node = ReactDOM.findDOMNode(stub);
      setUntrackedValue.call(node, '2');
      dispatchEventOnNode(node, 'input');
      expect(node.getAttribute('value')).toBe('2');
    });
    it('does not set the value attribute on number inputs if focused', () => {
      const Input = getTestInput();
      const stub = ReactDOM.render(
        <Input type="number" value="1" />,
        container,
      );
      const node = ReactDOM.findDOMNode(stub);
      node.focus();
      setUntrackedValue.call(node, '2');
      dispatchEventOnNode(node, 'input');
      expect(node.getAttribute('value')).toBe('1');
    });
    it('sets the value attribute on number inputs on blur', () => {
      const Input = getTestInput();
      const stub = ReactDOM.render(
        <Input type="number" value="1" />,