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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
type = container.tagName;
      namespace = getChildNamespace(ownNamespace, type);
      break;
    }
  }
  if (__DEV__) {
    const validatedTag = type.toLowerCase();
    const ancestorInfo = updatedAncestorInfo(null, validatedTag);
    return {namespace, ancestorInfo};
  }
  return namespace;
}
export function getChildHostContext(
  parentHostContext: HostContext,
  type: string,
  rootContainerInstance: Container,
): HostContext {
  if (__DEV__) {
    const parentHostContextDev = ((parentHostContext: any): HostContextDev);
    const namespace = getChildNamespace(parentHostContextDev.namespace, type);
    const ancestorInfo = updatedAncestorInfo(
      parentHostContextDev.ancestorInfo,
      type,
    );
    return {namespace, ancestorInfo};
  }
  const parentNamespace = ((parentHostContext: any): HostContextProd);
  return getChildNamespace(parentNamespace, type);
}
export function getPublicInstance(instance: Instance): * {