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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 `aria` attribute is reserved for future use in React. ' +
          'Pass individual `aria-` attributes instead.',
      );
    });
    it('should warn if the tag is unrecognized', () => {
      let realToString;
      try {
        realToString = Object.prototype.toString;
        let wrappedToString = function() {
          
          if (this instanceof window.HTMLUnknownElement) {
            return '[object HTMLUnknownElement]';
          }
          
          if (this instanceof window.HTMLTimeElement) {
            return '[object HTMLUnknownElement]';
          }
          return realToString.apply(this, arguments);
        };
        Object.prototype.toString = wrappedToString; 
        expect(() => ReactTestUtils.renderIntoDocument(<bar />)).toWarnDev(
          'The tag <bar> is unrecognized in this browser',
        );
        
        expect(() => ReactTestUtils.renderIntoDocument(<foo />)).toWarnDev(
          'The tag <foo> is unrecognized in this browser',
        );
        ReactTestUtils.renderIntoDocument(<foo />);