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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
const ReactDOM: Object = {
  createPortal,
  findDOMNode(
    componentOrElement: Element | ?React$Component<any, any>,
  ): null | Element | Text {
    if (__DEV__) {
      let owner = (ReactCurrentOwner.current: any);
      if (owner !== null && owner.stateNode !== null) {
        const warnedAboutRefsInRender =
          owner.stateNode._warnedAboutRefsInRender;
        warningWithoutStack(
          warnedAboutRefsInRender,
          '%s is accessing findDOMNode inside its render(). ' +
            'render() should be a pure function of props and state. It should ' +
            'never access something that requires stale data from the previous ' +
            'render, such as refs. Move this logic to componentDidMount and ' +
            'componentDidUpdate instead.',
          getComponentName(owner.type) || 'A component',
        );
        owner.stateNode._warnedAboutRefsInRender = true;
      }
    }
    if (componentOrElement == null) {
      return null;
    }
    if ((componentOrElement: any).nodeType === ELEMENT_NODE) {
      return (componentOrElement: any);
    }
    return DOMRenderer.findHostInstance(componentOrElement);
  },