**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 ownerDocument: Document = getOwnerDocumentFromRootContainer(
    rootContainerElement,
  );
  let domElement: Element;
  let namespaceURI = parentNamespace;
  if (namespaceURI === HTML_NAMESPACE) {
    namespaceURI = getIntrinsicNamespace(type);
  }
  if (namespaceURI === HTML_NAMESPACE) {
    if (__DEV__) {
      isCustomComponentTag = isCustomComponent(type, props);
      
      
      warning(
        isCustomComponentTag || type === type.toLowerCase(),
        '<%s /> is using incorrect casing. ' +
          'Use PascalCase for React components, ' +
          'or lowercase for HTML elements.',
        type,
      );
    }
    if (type === 'script') {
      
      
      const div = ownerDocument.createElement('div');
      div.innerHTML = '<script><' + '/script>'; 
      
      const firstChild = ((div.firstChild: any): HTMLScriptElement);