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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
if (container.nodeType === COMMENT_NODE) {
    (container.parentNode: any).removeChild(child);
  } else {
    container.removeChild(child);
  }
}
export const supportsHydration = true;
export function canHydrateInstance(
  instance: Instance | TextInstance,
  type: string,
  props: Props,
): null | Instance {
  if (
    instance.nodeType !== ELEMENT_NODE ||
    type.toLowerCase() !== instance.nodeName.toLowerCase()
  ) {
    return null;
  }
  
  return ((instance: any): Instance);
}
export function canHydrateTextInstance(
  instance: Instance | TextInstance,
  text: string,
): null | TextInstance {
  if (text === '' || instance.nodeType !== TEXT_NODE) {
    
    return null;
  }