**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

return ((instance: any): TextInstance);
}
export function getNextHydratableSibling(
  instance: Instance | TextInstance,
): null | Instance | TextInstance {
  let node = instance.nextSibling;
  
  while (
    node &&
    node.nodeType !== ELEMENT_NODE &&
    node.nodeType !== TEXT_NODE
  ) {
    node = node.nextSibling;
  }
  return (node: any);
}
export function getFirstHydratableChild(
  parentInstance: Container | Instance,
): null | Instance | TextInstance {
  let next = parentInstance.firstChild;
  
  while (
    next &&
    next.nodeType !== ELEMENT_NODE &&
    next.nodeType !== TEXT_NODE
  ) {
    next = next.nextSibling;
  }
  return (next: any);
}