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. 
const clientRenderOnBadMarkup = async (element, errorCount = 0) => {
  
  var domElement = document.createElement('div');
  domElement.innerHTML =
    '<div id="badIdWhichWillCauseMismatch" data-reactroot="" data-reactid="1"></div>';
  await renderIntoDom(element, domElement, true, errorCount + 1);
  
  var hydratedTextContent = domElement.textContent;
  
  const cleanDomElement = document.createElement('div');
  ExecutionEnvironment.canUseDOM = true;
  await asyncReactDOMRender(element, cleanDomElement, true);
  ExecutionEnvironment.canUseDOM = false;
  
  const cleanTextContent = cleanDomElement.textContent;
  
  expect(hydratedTextContent).toBe(cleanTextContent);
  
  throw new BadMarkupExpected();
};
function itRenders(desc, testFn) {
  it(`renders ${desc} with server string render`, () => testFn(serverRender));
  it(`renders ${desc} with server stream render`, () => testFn(streamRender));
  itClientRenders(desc, testFn);
}
function itClientRenders(desc, testFn) {