**Do you want to request a *feature* or report a *bug*?**

bug? Maybe.

**What is the current behavior?**

Using non-delegated handler for submit event.

**What is the expected behavior?**

After IE9, at least I know, submit event bubbled up.

**Which versions of React, and which browser / OS are affected by this issue? Did this work in previous versions of React?**

16.2.0
const childNode = ReactDOM.render(
        <div onMouseOut={handleChildMouseOut}>Child</div>,
        childContainer,
      );
      const parentNode = ReactDOM.render(
        <div onMouseOut={handleParentMouseOut}>Parent</div>,
        parentContainer,
      );
      parentNode.appendChild(childContainer);
      document.body.appendChild(parentContainer);
      const nativeEvent = document.createEvent('Event');
      nativeEvent.initEvent('mouseout', true, true);
      childNode.dispatchEvent(nativeEvent);
      
      expect(mock).toHaveBeenCalledTimes(2);
      
      
      expect(mock.mock.calls[0][0]).toBe('Child');
      
      
      expect(mock.mock.calls[1][0]).toBe('Child');
      
      expect(childNode.textContent).toBe('2');
      document.body.removeChild(parentContainer);
    });
  });
  it('should not fire duplicate events for a React DOM tree', () => {
    const mouseOut = jest.fn();
    const onMouseOut = event => mouseOut(event.target);
    class Wrapper extends React.Component {