**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
newProps: Props,
      internalInstanceHandle: Object,
    ): void {
      
      
      updateFiberProps(domElement, newProps);
      
      updateProperties(domElement, updatePayload, type, oldProps, newProps);
    },
    resetTextContent(domElement: Instance): void {
      domElement.textContent = '';
    },
    commitTextUpdate(
      textInstance: TextInstance,
      oldText: string,
      newText: string,
    ): void {
      textInstance.nodeValue = newText;
    },
    appendChild(
      parentInstance: Instance,
      child: Instance | TextInstance,
    ): void {
      parentInstance.appendChild(child);
    },
    appendChildToContainer(
      container: Container,
      child: Instance | TextInstance,
    ): void {
      if (container.nodeType === COMMENT_NODE) {