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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
expect(container.firstChild.attributes.length).toBe(0);
          ReactDOM.render(
            React.createElement(
              'div',
              {'></div><script>alert("hi")</script>': 'selected'},
              null,
            ),
            container,
          );
          expect(container.firstChild.attributes.length).toBe(0);
        }
      }).toWarnDev([
        'Warning: Invalid attribute name: `blah" onclick="beevil" noise="hi`',
        'Warning: Invalid attribute name: `></div><script>alert("hi")</script>`',
      ]);
    });
    it('should reject attribute key injection attack on update for custom elements', () => {
      expect(() => {
        for (let i = 0; i < 3; i++) {
          const container = document.createElement('div');
          const beforeUpdate = React.createElement('x-foo-component', {}, null);
          ReactDOM.render(beforeUpdate, container);
          ReactDOM.render(
            React.createElement(
              'x-foo-component',
              {'blah" onclick="beevil" noise="hi': 'selected'},
              null,
            ),
            container,
          );