**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
domElement,
            propKey,
            nextProp,
            propertyInfo,
          );
        } else {
          let ownNamespace = parentNamespace;
          if (ownNamespace === HTML_NAMESPACE) {
            ownNamespace = getIntrinsicNamespace(tag);
          }
          if (ownNamespace === HTML_NAMESPACE) {
            
            extraAttributeNames.delete(propKey.toLowerCase());
          } else {
            const standardName = getPossibleStandardName(propKey);
            if (standardName !== null && standardName !== propKey) {
              
              
              
              
              
              isMismatchDueToBadCasing = true;
              
              extraAttributeNames.delete(standardName);
            }
            
            extraAttributeNames.delete(propKey);
          }
          serverValue = DOMPropertyOperations.getValueForAttribute(
            domElement,