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.
it('should reconnect Pure Component to Pure Component', () =>
          expectMarkupMatch(
            <PureComponent id="foobarbaz" />,
            <PureComponent id="foobarbaz" />,
          ));
        it('should reconnect Bare Element to Pure Component', () =>
          expectMarkupMatch(<PureComponent id="foobarbaz" />, bareElement));
        it('should reconnect ES6 Class to Bare Element', () =>
          expectMarkupMatch(bareElement, <ES6ClassComponent id="foobarbaz" />));
        it('should reconnect Pure Component to Bare Element', () =>
          expectMarkupMatch(bareElement, <PureComponent id="foobarbaz" />));
        it('should reconnect Bare Element to Bare Element', () =>
          expectMarkupMatch(bareElement, bareElement));
      });
      it('should error reconnecting different element types', () =>
        expectMarkupMismatch(<div />, <span />));
      it('should error reconnecting missing attributes', () =>
        expectMarkupMismatch(<div id="foo" />, <div />));
      it('should error reconnecting added attributes', () =>
        expectMarkupMismatch(<div />, <div id="foo" />));
      it('should error reconnecting different attribute values', () =>
        expectMarkupMismatch(<div id="foo" />, <div id="bar" />));
    });
    describe('inline styles', function() {
      it('should error reconnecting missing style attribute', () =>
        expectMarkupMismatch(<div style={{width: '1px'}} />, <div />));
      it('should error reconnecting added style attribute', () =>
        expectMarkupMismatch(<div />, <div style={{width: '1px'}} />));
      it('should error reconnecting empty style attribute', () =>
        expectMarkupMismatch(