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.
)
      ? EventPluginRegistry.possibleRegistrationNames[lowerCasedName]
      : null;
    if (standardName != null) {
      warning(
        false,
        'Unknown DOM property %s. Did you mean %s?%s',
        name,
        standardName,
        getStackAddendum(debugID),
      );
      return true;
    } else if (registrationName != null) {
      warning(
        false,
        'Unknown event handler property %s. Did you mean `%s`?%s',
        name,
        registrationName,
        getStackAddendum(debugID),
      );
      return true;
    } else {
      
      
      
      
      return false;
    }
  };
}