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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
typeof Set.prototype.clear !== 'function' ||
    typeof Set.prototype.forEach !== 'function'
  ) {
    warningWithoutStack(
      false,
      'React depends on Map and Set built-in types. Make sure that you load a ' +
        'polyfill in older browsers. https://fb.me/react-polyfills',
    );
  }
  topLevelUpdateWarnings = (container: DOMContainer) => {
    if (container._reactRootContainer && container.nodeType !== COMMENT_NODE) {
      const hostInstance = DOMRenderer.findHostInstanceWithNoPortals(
        container._reactRootContainer._internalRoot.current,
      );
      if (hostInstance) {
        warningWithoutStack(
          hostInstance.parentNode === container,
          'render(...): It looks like the React-rendered content of this ' +
            'container was removed without using React. This is not ' +
            'supported and will cause errors. Instead, call ' +
            'ReactDOM.unmountComponentAtNode to empty a container.',
        );
      }
    }
    const isRootRenderedBySomeReact = !!container._reactRootContainer;
    const rootEl = getReactRootElementInContainer(container);
    const hasNonRootReactChild = !!(
      rootEl && ReactDOMComponentTree.getInstanceFromNode(rootEl)
    );
    warningWithoutStack(