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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
'The `style` prop expects a mapping from style properties to values, ' +
          "not a string. For example, style={{marginRight: spacing + 'em'}} " +
          'when using JSX.' +
          (__DEV__ ? '\n    in div (at **)' + '\n    in Animal (at **)' : ''),
      );
    });
    it('should properly escape text content and attributes values', () => {
      expect(
        ReactDOMServer.renderToStaticMarkup(
          React.createElement(
            'div',
            {
              title: '\'"<>&',
              style: {
                textAlign: '\'"<>&',
              },
            },
            '\'"<>&',
          ),
        ),
      ).toBe(
        '<div title="&#x27;&quot;&lt;&gt;&amp;" style="text-align:&#x27;&quot;&lt;&gt;&amp;">' +
          '&#x27;&quot;&lt;&gt;&amp;' +
          '</div>',
      );
    });
  });
  describe('unmountComponent', () => {
    it('unmounts children before unsetting DOM node info', () => {
      class Inner extends React.Component {