See the original report in https://github.com/facebook/react/issues/10772#issuecomment-333242375.

The problem is that SVG is case sensitive, and so naïvely setting `tabIndex` and relying on insensitivity won't work with it.

The good news is it seems like `tabindex` is the only valid [SVG attribute](https://developer.mozilla.org/en-US/docs/Web/SVG/Attribute) with this problem. We just missed it because it applies both to HTML and SVG.

I think the fix is to add it back to the whitelist. 
it('should error reconnecting empty style attribute', () =>
        expectMarkupMismatch(
          <div style={{width: '1px'}} />,
          <div style={{}} />,
        ));
      it('should error reconnecting added style values', () =>
        expectMarkupMismatch(
          <div style={{}} />,
          <div style={{width: '1px'}} />,
        ));
      it('should error reconnecting different style values', () =>
        expectMarkupMismatch(
          <div style={{width: '1px'}} />,
          <div style={{width: '2px'}} />,
        ));
      it('should reconnect number and string versions of a number', () =>
        expectMarkupMatch(
          <div style={{width: '1px', height: 2}} />,
          <div style={{width: 1, height: '2px'}} />,
        ));
      it('should error reconnecting reordered style values', () =>
        expectMarkupMismatch(
          <div style={{width: '1px', fontSize: '2px'}} />,
          <div style={{fontSize: '2px', width: '1px'}} />,
        ));
    });
    describe('text nodes', function() {
      it('should error reconnecting different text', () =>
        expectMarkupMismatch(<div>Text</div>, <div>Other Text</div>));
      it('should reconnect a div with a number and string version of number', () =>