*Bug*

When a `textarea` has the `required` attribute it renders in the invalid state using FireFox. 

This behavior is visible here: https://codesandbox.io/s/rough-frog-f00ow. Remember to view it in FireFox.  

I expect the required field to validate on form submit and not before. 

I have tested this with FireFox 68 and 69 and React 16.8.6

This appears appears to be a re-occurrence of: https://github.com/facebook/react/issues/8395


it('should allow setting `value` to `giraffe`', () => {
    const container = document.createElement('div');
    let stub = <textarea value="giraffe" onChange={emptyFunction} />;
    const node = renderTextarea(stub, container);
    expect(node.value).toBe('giraffe');
    stub = ReactDOM.render(
      <textarea value="gorilla" onChange={emptyFunction} />,
      container,
    );
    expect(node.value).toEqual('gorilla');
  });
  it('should render defaultValue for SSR', () => {
    const markup = ReactDOMServer.renderToString(<textarea defaultValue="1" />);
    const div = document.createElement('div');
    div.innerHTML = markup;
    expect(div.firstChild.innerHTML).toBe('1');
    expect(div.firstChild.getAttribute('defaultValue')).toBe(null);
  });
  it('should render value for SSR', () => {
    const element = <textarea value="1" onChange={function() {}} />;
    const markup = ReactDOMServer.renderToString(element);
    const div = document.createElement('div');
    div.innerHTML = markup;
    expect(div.firstChild.innerHTML).toBe('1');
    expect(div.firstChild.getAttribute('defaultValue')).toBe(null);
  });
  it('should allow setting `value` to `true`', () => {
    const container = document.createElement('div');
    let stub = <textarea value="giraffe" onChange={emptyFunction} />;
    const node = renderTextarea(stub, container);