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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
suppressHydrationWarning?: boolean,
  dangerouslySetInnerHTML?: mixed,
};
export type Container = Element | Document;
export type Instance = Element;
export type TextInstance = Text;
export type HydratableInstance = Element | Text;
export type PublicInstance = Element | Text;
type HostContextDev = {
  namespace: string,
  ancestorInfo: mixed,
};
type HostContextProd = string;
export type HostContext = HostContextDev | HostContextProd;
export type UpdatePayload = Array<mixed>;
export type ChildSet = void; 
export type TimeoutHandle = TimeoutID;
export type NoTimeout = -1;
export {
  unstable_now as now,
  unstable_scheduleCallback as scheduleDeferredCallback,
  unstable_cancelCallback as cancelDeferredCallback,
} from 'scheduler';
let SUPPRESS_HYDRATION_WARNING;
if (__DEV__) {
  SUPPRESS_HYDRATION_WARNING = 'suppressHydrationWarning';
}
let eventsEnabled: ?boolean = null;
let selectionInformation: ?mixed = null;
function shouldAutoFocusHostComponent(type: string, props: Props): boolean {