If user writes for instead of htmlFor, warning is shown. I suppose autofocus instead of autoFocus should warn too.

ReactDOM.render(
        <div>
          <div key="one">
            <div key="A">A</div><div key="B">B</div>
          </div>
          <div key="two">
            <div key="C">C</div><div key="D">D</div>
          </div>
        </div>,
        container
      );
      
      ReactDOM.render(
        <div>
          <div key="one">
            <div key="B">B</div><div key="A">A</div>
          </div>
          <div key="two">
            <div key="D">D</div><div key="C">C</div>
          </div>
        </div>,
        container
      );
      expect(container.textContent).toBe('BADC');
    });
  });
  describe('createOpenTagMarkup', () => {
    var genMarkup;
    function quoteRegexp(str) {