*feature*

>Warning: A component is `contentEditable` and contains `children` managed by React. It is now your responsibility to guarantee that none of those nodes are unexpectedly modified or duplicated. This is probably not intentional.

It would help heaps if I would know _which_ component is causing this.
ReactTestUtils.renderIntoDocument(
        React.createElement('input', {type: 'text', autofocus: true}),
      );
      expectDev(console.error.calls.count()).toBe(2);
      expectDev(console.error.calls.argsFor(0)[0]).toBe(
        'Warning: Invalid DOM property `for`. Did you mean `htmlFor`?\n    in label',
      );
      expectDev(console.error.calls.argsFor(1)[0]).toBe(
        'Warning: Invalid DOM property `autofocus`. Did you mean `autoFocus`?\n    in input',
      );
    });
    it('should suggest property name if available (ssr)', () => {
      spyOn(console, 'error');
      ReactDOMServer.renderToString(
        React.createElement('label', {for: 'test'}),
      );
      ReactDOMServer.renderToString(
        React.createElement('input', {type: 'text', autofocus: true}),
      );
      expectDev(console.error.calls.count()).toBe(2);
      expectDev(console.error.calls.argsFor(0)[0]).toBe(
        'Warning: Invalid DOM property `for`. Did you mean `htmlFor`?\n    in label',
      );
      expectDev(console.error.calls.argsFor(1)[0]).toBe(
        'Warning: Invalid DOM property `autofocus`. Did you mean `autoFocus`?\n    in input',
      );
    });
  });
  describe('whitespace', () => {
    it('renders innerHTML and preserves whitespace', () => {