**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
ReactDOM = require('react-dom');
  });
  it('should dispatch events from outside React tree', () => {
    const mock = jest.fn();
    const container = document.createElement('div');
    const node = ReactDOM.render(<div onMouseEnter={mock} />, container);
    const otherNode = document.createElement('h1');
    document.body.appendChild(container);
    document.body.appendChild(otherNode);
    otherNode.dispatchEvent(
      new MouseEvent('mouseout', {
        bubbles: true,
        cancelable: true,
        relatedTarget: node,
      }),
    );
    expect(mock).toBeCalled();
  });
  describe('Propagation', () => {
    it('should propagate events one level down', () => {
      const mouseOut = jest.fn();
      const onMouseOut = event => mouseOut(event.currentTarget);
      const childContainer = document.createElement('div');
      const parentContainer = document.createElement('div');
      const childNode = ReactDOM.render(
        <div onMouseOut={onMouseOut}>Child</div>,
        childContainer,
      );
      const parentNode = ReactDOM.render(
        <div onMouseOut={onMouseOut}>div</div>,