**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

updateDOMProperties(
    domElement,
    updatePayload,
    wasCustomComponentTag,
    isCustomComponentTag,
  );
  
  
  switch (tag) {
    case 'input':
      
      
      
      ReactDOMFiberInput.updateWrapper(domElement, nextRawProps);
      break;
    case 'textarea':
      ReactDOMFiberTextarea.updateWrapper(domElement, nextRawProps);
      break;
    case 'select':
      
      
      ReactDOMFiberSelect.postUpdateWrapper(domElement, nextRawProps);
      break;
  }
}
function getPossibleStandardName(propName: string): string | null {
  if (__DEV__) {
    const lowerCasedName = propName.toLowerCase();
    if (!possibleStandardNames.hasOwnProperty(lowerCasedName)) {
      return null;