Run the [`fixtures/ssr` test harness](https://github.com/facebook/react/tree/master/fixtures/ssr). In the terminal, the following warning is logged:

```
Warning: Unknown prop `onClick` on <a> tag. Remove this prop from the element. For details, see https://fb.me/react-unknown-prop
  in a (at Page.js:12)
  in p (at Page.js:18)
  in div (at Page.js:17)
  in Page (at App.js:12)
  in div (at App.js:10)
  in body (at Chrome.js:17)
  in html (at Chrome.js:9)
  in Chrome (at App.js:9)
  in App (at render.js:18)
```

SSR behavior should match client-side behavior and not warn for a valid attribute.
if (debugID != null) {
    
    return getStackAddendumByID(debugID);
  } else {
    
    var stack = ReactDebugCurrentFrame.getStackAddendum();
    return stack != null ? stack : '';
  }
}
if (__DEV__) {
  var reactProps = {
    children: true,
    dangerouslySetInnerHTML: true,
    key: true,
    ref: true,
    autoFocus: true,
    defaultValue: true,
    defaultChecked: true,
    innerHTML: true,
    suppressContentEditableWarning: true,