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

**What is the current behavior?**
In mobile Safari, DOM events originating from elements rendered through a Portal do **not** bubble (propagate) up the React component tree.

**If the current behavior is a bug, please provide the steps to reproduce....**
Please see the following JSFiddle: https://jsfiddle.net/zebulonj/wf7orwan/

In this JSFiddle, the expected behavior (seen in a desktop browser) is that clicking on the portal content (appearing as a modal, including backdrop) should toggle to the "On" or "Off" indicator rendered in the main content. However, in mobile Safari (iOS 11.1.1), the click events do not propagate.


**What is the expected behavior?**
Click events should propagate up the React component tree.

**Which versions of React, and which browser / OS are affected by this issue? Did this work in previous versions of React?**
Affected: React 16.2
iOS 11.1.1

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,