Nikolai Mavrenkov already created a good description of the problem on Stack Overflow: http://stackoverflow.com/questions/36893449/textarea-placeholder-isnt-shown-in-ie-11-being-rendered-using-react

I just can confirm it breaks in IE11, but works in IE10 (and other browsers) with React v15.0.2.

ReactBrowserEventEmitter.trapBubbledEvent(
              event,
              mediaEvents[event],
              node
            )
          );
        }
      }
      break;
    case 'source':
      inst._wrapperState.listeners = [
        ReactBrowserEventEmitter.trapBubbledEvent(
          'topError',
          'error',
          node
        ),
      ];
      break;
    case 'img':
      inst._wrapperState.listeners = [
        ReactBrowserEventEmitter.trapBubbledEvent(
          'topError',
          'error',
          node
        ),
        ReactBrowserEventEmitter.trapBubbledEvent(
          'topLoad',
          'load',
          node
        ),