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 listenerToPut = this;
  EventPluginHub.putListener(
    listenerToPut.inst,
    listenerToPut.registrationName,
    listenerToPut.listener
  );
}
var mediaEvents = {
  topAbort: 'abort',
  topCanPlay: 'canplay',
  topCanPlayThrough: 'canplaythrough',
  topDurationChange: 'durationchange',
  topEmptied: 'emptied',
  topEncrypted: 'encrypted',
  topEnded: 'ended',
  topError: 'error',
  topLoadedData: 'loadeddata',
  topLoadedMetadata: 'loadedmetadata',
  topLoadStart: 'loadstart',
  topPause: 'pause',
  topPlay: 'play',