**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

ReactDOMFiberInput.postMountWrapper(domElement, rawProps, false);
      break;
    case 'textarea':
      
      
      inputValueTracking.track((domElement: any));
      ReactDOMFiberTextarea.postMountWrapper(domElement, rawProps);
      break;
    case 'option':
      ReactDOMFiberOption.postMountWrapper(domElement, rawProps);
      break;
    case 'select':
      ReactDOMFiberSelect.postMountWrapper(domElement, rawProps);
      break;
    default:
      if (typeof props.onClick === 'function') {
        
        trapClickOnNonInteractiveElement(((domElement: any): HTMLElement));
      }
      break;
  }
}
export function diffProperties(
  domElement: Element,
  tag: string,
  lastRawProps: Object,
  nextRawProps: Object,
  rootContainerElement: Element | Document,
): null | Array<mixed> {
  if (__DEV__) {