**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
wasCustomComponentTag: boolean,
  isCustomComponentTag: boolean,
): void {
  
  for (let i = 0; i < updatePayload.length; i += 2) {
    const propKey = updatePayload[i];
    const propValue = updatePayload[i + 1];
    if (propKey === STYLE) {
      CSSPropertyOperations.setValueForStyles(domElement, propValue);
    } else if (propKey === DANGEROUSLY_SET_INNER_HTML) {
      setInnerHTML(domElement, propValue);
    } else if (propKey === CHILDREN) {
      setTextContent(domElement, propValue);
    } else {
      DOMPropertyOperations.setValueForProperty(
        domElement,
        propKey,
        propValue,
        isCustomComponentTag,
      );
    }
  }
}
export function createElement(
  type: string,
  props: Object,
  rootContainerElement: Element | Document,
  parentNamespace: string,
): Element {
  let isCustomComponentTag;