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.
describe('inline styles', function() {
      itRenders('simple styles', async render => {
        const e = await render(<div style={{color: 'red', width: '30px'}} />);
        expect(e.style.color).toBe('red');
        expect(e.style.width).toBe('30px');
      });
      itRenders('relevant styles with px', async render => {
        const e = await render(
          <div
            style={{
              left: 0,
              margin: 16,
              opacity: 0.5,
              padding: '4px',
            }}
          />,
        );
        expect(e.style.left).toBe('0px');
        expect(e.style.margin).toBe('16px');
        expect(e.style.opacity).toBe('0.5');
        expect(e.style.padding).toBe('4px');
      });
      itRenders('custom properties', async render => {
        const e = await render(<div style={{'--foo': 5}} />);
        
        
        expect(e.style.Foo).toBe('5');
      });
      itRenders('no undefined styles', async render => {
        const e = await render(