**Do you want to request a *feature* or report a *bug*?**
bug

**What is the current behavior?**
If there is a client/server mismatch for text inside of an a or button element, it causes it to be automatically focused on page load.

**If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem via https://jsfiddle.net or similar (template for React 16: https://jsfiddle.net/Luktwrdm/, template for React 15: https://jsfiddle.net/hmbg7e9w/).**
```
let text;
let URL = '/randomURL';
if (typeof window !== 'undefined') {
  text = 'CLIENT TEXT';
} else {
  text = 'TEXT';
}

return (
  <a href={URL}>
    {text}
  </a>
);
```

if the focus is not on the window (i.e. if a dom element is selected in the chrome inspector or react inspector widnow), then it doesn't add the focus.

**What is the expected behavior?**
The expected behavior is that it would either show CLIENT TEXT or TEXT (depending on how React16 resolves the diff), but for it not to be automatically highlighted 

**Which versions of React, and which browser / OS are affected by this issue? Did this work in previous versions of React?**
React16 / macosx / chrome + ff + safari
import {ReactCurrentOwner} from 'shared/ReactGlobalSharedState';
import getComponentName from 'shared/getComponentName';
import invariant from 'fbjs/lib/invariant';
import lowPriorityWarning from 'shared/lowPriorityWarning';
import warning from 'fbjs/lib/warning';
import * as ReactDOMComponentTree from './ReactDOMComponentTree';
import * as ReactDOMFiberComponent from './ReactDOMFiberComponent';
import * as ReactInputSelection from './ReactInputSelection';
import validateDOMNesting from './validateDOMNesting';
import * as ReactBrowserEventEmitter from '../events/ReactBrowserEventEmitter';
import * as ReactDOMEventListener from '../events/ReactDOMEventListener';
import {getChildNamespace} from '../shared/DOMNamespaces';
import {
  ELEMENT_NODE,
  TEXT_NODE,
  COMMENT_NODE,
  DOCUMENT_NODE,
  DOCUMENT_FRAGMENT_NODE,
} from '../shared/HTMLNodeType';
import {ROOT_ATTRIBUTE_NAME} from '../shared/DOMProperty';
const {
  createElement,
  createTextNode,
  setInitialProperties,
  diffProperties,
  updateProperties,
  diffHydratedProperties,
  diffHydratedText,
  warnForUnmatchedText,
  warnForDeletedHydratableElement,