Appears to be working in Firefox but at least Chrome & Safari are broken. Should be a really recent regression so very few possible changes to blame...

Easiest repo: the todo list on our homepage.

var Row = React.createClass({
        render: function() {
          return <tr />;
        },
      });
      var Foo = React.createClass({
        render: function() {
          return <table><Row /> </table>;
        },
      });
      ReactTestUtils.renderIntoDocument(<Foo />);
      expect(console.error.calls.length).toBe(2);
      expect(console.error.argsForCall[0][0]).toBe(
        'Warning: validateDOMNesting(...): <tr> cannot appear as a child of ' +
        '<table>. See Foo > table > Row > tr. Add a <tbody> to your code to ' +
        'match the DOM tree generated by the browser.'
      );
      expect(console.error.argsForCall[1][0]).toBe(
        'Warning: validateDOMNesting(...): #text cannot appear as a child ' +
        'of <table>. See Foo > table > #text.'
      );
    });
    it('gives useful context in warnings', () => {
      spyOn(console, 'error');
      var Row = React.createClass({
        render: () => <tr />,
      });
      var FancyRow = React.createClass({
        render: () => <Row />,
      });