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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
_reactRootContainer: ?Root,
    })
  | (Document & {
      _reactRootContainer: ?Root,
    });
type Batch = FiberRootBatch & {
  render(children: ReactNodeList): Work,
  then(onComplete: () => mixed): void,
  commit(): void,
  
  
  
  _root: Root,
  _hasChildren: boolean,
  _children: ReactNodeList,
  _callbacks: Array<() => mixed> | null,
  _didComplete: boolean,
};
type Root = {
  render(children: ReactNodeList, callback: ?() => mixed): Work,
  unmount(callback: ?() => mixed): Work,
  legacy_renderSubtreeIntoContainer(
    parentComponent: ?React$Component<any, any>,
    children: ReactNodeList,
    callback: ?() => mixed,
  ): Work,
  createBatch(): Batch,
  _internalRoot: FiberRoot,
};
function ReactBatch(root: ReactRoot) {