*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.
'x-foo-component',
          {'blah" onclick="beevil" noise="hi': 'selected'},
          null,
        );
        ReactDOM.render(element, container);
      }
      expectDev(console.error.calls.count()).toBe(1);
      expectDev(console.error.calls.argsFor(0)[0]).toEqual(
        'Warning: Invalid attribute name: `blah" onclick="beevil" noise="hi`',
      );
    });
    it('should reject attribute key injection attack on update', () => {
      spyOn(console, 'error');
      for (var i = 0; i < 3; i++) {
        var container = document.createElement('div');
        var beforeUpdate = React.createElement('x-foo-component', {}, null);
        ReactDOM.render(beforeUpdate, container);
        var afterUpdate = React.createElement(
          'x-foo-component',
          {'blah" onclick="beevil" noise="hi': 'selected'},
          null,
        );
        ReactDOM.render(afterUpdate, container);
      }
      expectDev(console.error.calls.count()).toBe(1);
      expectDev(console.error.calls.argsFor(0)[0]).toEqual(
        'Warning: Invalid attribute name: `blah" onclick="beevil" noise="hi`',
      );
    });
    it('should update arbitrary attributes for tags containing dashes', () => {