Animator not working on Web? about animator HOT 3 CLOSED

class _MyHomePageState extends State<MyHomePage> {
  final GlobalKey<AnimatorWidgetState> inOutAnimation =
      GlobalKey<AnimatorWidgetState>();

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Flutter Animator'),
      ),
      body: Column(
        children: [
          FadeInLeft(
            key: inOutAnimation,
            preferences: AnimationPreferences(
              autoPlay: AnimationPlayStates.None,
            ),
            child: Container(
              width: 200,
              height: 200,
              color: Colors.blue,
              child: Text("TopMenu"),
            ),
          ),
          TextButton(
            onPressed: () {
              inOutAnimation.currentState.forward();
            },
            child: Text('Start animation'),
          ),
        ],
      ),
    );
  }
}