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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)

);
      didWarnControlledToUncontrolled = true;
    }
  }
  updateChecked(element, props);
  const value = getToStringValue(props.value);
  if (value != null) {
    if (props.type === 'number') {
      if (
        (value === 0 && node.value === '') ||
        
        
        node.value != (value: any)
      ) {
        node.value = toString(value);
      }
    } else if (node.value !== toString(value)) {
      node.value = toString(value);
    }
  }
  if (props.hasOwnProperty('value')) {
    setDefaultValue(node, props.type, value);
  } else if (props.hasOwnProperty('defaultValue')) {
    setDefaultValue(node, props.type, getToStringValue(props.defaultValue));
  }
  if (props.checked == null && props.defaultChecked != null) {
    node.defaultChecked = !!props.defaultChecked;
  }
}
export function postMountWrapper(