**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
constructor(props) {
            super(props);
            lifecycle.push('getInitialState');
            this.state = {name: 'TestComponent'};
          }
          componentWillMount() {
            lifecycle.push('componentWillMount');
          }
          componentDidMount() {
            lifecycle.push('componentDidMount');
          }
          render() {
            lifecycle.push('render');
            return <span>Component name: {this.state.name}</span>;
          }
          componentWillUpdate() {
            lifecycle.push('componentWillUpdate');
          }
          componentDidUpdate() {
            lifecycle.push('componentDidUpdate');
          }
          shouldComponentUpdate() {
            lifecycle.push('shouldComponentUpdate');
          }
          componentWillReceiveProps() {
            lifecycle.push('componentWillReceiveProps');
          }
          componentWillUnmount() {