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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
return work;
};
ReactBatch.prototype.then = function(onComplete: () => mixed) {
  if (this._didComplete) {
    onComplete();
    return;
  }
  let callbacks = this._callbacks;
  if (callbacks === null) {
    callbacks = this._callbacks = [];
  }
  callbacks.push(onComplete);
};
ReactBatch.prototype.commit = function() {
  const internalRoot = this._root._internalRoot;
  let firstBatch = internalRoot.firstBatch;
  invariant(
    this._defer && firstBatch !== null,
    'batch.commit: Cannot commit a batch multiple times.',
  );
  if (!this._hasChildren) {
    
    this._next = null;
    this._defer = false;
    return;
  }
  let expirationTime = this._expirationTime;
  
  if (firstBatch !== this) {