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

**What is the current behavior?**

Since React@16.5 seems that `root` element has `onclick` event handler with noop function.
In ios Safari/Chrome browsers html element has gray overlay when tap on it.

The current behavior is that the whole `root` is blinking when we tap on it.

The simple example to reproduce:
https://codesandbox.io/s/wyo8rlj1zk
The issue is reproducing only in fullscreen mode https://wyo8rlj1zk.codesandbox.io/
(root container is steel blue)

I suppose changes came from here:
https://github.com/facebook/react/pull/11927
https://github.com/facebook/react/pull/11927/files

and the issue can be related with:
https://github.com/mui-org/material-ui/issues/11154
https://github.com/facebook/react/issues/12717

**Which versions of React, and which browser / OS are affected by this issue? Did this work in previous versions of React?**
React 16.5
ios 11.3/12 Safari/Chrome
callback = function() {
        const instance = DOMRenderer.getPublicRootInstance(root._internalRoot);
        originalCallback.call(instance);
      };
    }
    
    if (parentComponent != null) {
      root.legacy_renderSubtreeIntoContainer(
        parentComponent,
        children,
        callback,
      );
    } else {
      root.render(children, callback);
    }
  }
  return DOMRenderer.getPublicRootInstance(root._internalRoot);
}
function createPortal(
  children: ReactNodeList,
  container: DOMContainer,
  key: ?string = null,
) {
  invariant(
    isValidContainer(container),
    'Target container is not a DOM element.',
  );
  
  return ReactPortal.createPortal(children, container, null, key);
}