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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
'<div>.' +
          '\n    in tr (at **)' +
          '\n    in div (at **)',
      ]);
    });
    it('warns on invalid nesting at root', () => {
      const p = document.createElement('p');
      expect(() => {
        ReactDOM.render(
          <span>
            <p />
          </span>,
          p,
        );
      }).toWarnDev(
        'Warning: validateDOMNesting(...): <p> cannot appear as a descendant ' +
          'of <p>.' +
          
          '\n    in p (at **)' +
          '\n    in span (at **)',
      );
    });
    it('warns nicely for table rows', () => {
      class Row extends React.Component {
        render() {
          return <tr>x</tr>;
        }
      }
      class Foo extends React.Component {
        render() {