code: function getTargetInstForInputEventIE(topLevelType, targetInst) {
  	  if (topLevelType === topLevelTypes.topSelectionChange || topLevelType === topLevelTypes.topKeyUp || topLevelType === topLevelTypes.topKeyDown) {
  	    // On the selectionchange event, the target is just document which isn't
  	    // helpful for us so just check activeElement instead.
  	    //
  	    // 99% of the time, keydown and keyup aren't necessary. IE8 fails to fire
  	    // propertychange on the first input event after setting `value` from a
  	    // script and fires only keydown, keypress, keyup. Catching keyup usually
  	    // gets it and catching keydown lets us fire an event for the first
  	    // keystroke if user does a key repeat (it'll be a little delayed: right
  	    // before the second keystroke). Other input methods (e.g., paste) seem to
  	    // fire selectionchange normally.
  	    if (activeElement && activeElement.value !== activeElementValue) {
  	      activeElementValue = activeElement.value;
  	      return activeElementInst;
  	    }
  	  }
  	}
docs: For IE8 and IE9.