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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)

'Input elements must be either controlled or uncontrolled ' +
          '(specify either the value prop, or the defaultValue prop, but not ' +
          'both). Decide between using a controlled or uncontrolled input ' +
          'element and remove one of these props. More info: ' +
          'https:fb.me/react-controlled-components',
        getCurrentFiberOwnerNameInDevOrNull() || 'A component',
        props.type,
      );
      didWarnValueDefaultValue = true;
    }
  }
  const node = ((element: any): InputWithWrapperState);
  const defaultValue = props.defaultValue == null ? '' : props.defaultValue;
  node._wrapperState = {
    initialChecked:
      props.checked != null ? props.checked : props.defaultChecked,
    initialValue: getToStringValue(
      props.value != null ? props.value : defaultValue,
    ),
    controlled: isControlled(props),
  };
}
export function updateChecked(element: Element, props: Object) {
  const node = ((element: any): InputWithWrapperState);
  const checked = props.checked;
  if (checked != null) {
    DOMPropertyOperations.setValueForProperty(node, 'checked', checked, false);
  }
}
export function updateWrapper(element: Element, props: Object) {