anchor.diff:  ///
   /// {@youtube 560 315 https://www.youtube.com/watch?v=EeEfD5fI-5Q}
   ///
  -/// {@tool dartpad --template=stateless_widget_material}
  +/// {@tool dartpad --template=stateless_widget_scaffold_center}
   ///
   /// This example show a basic [Tooltip] which has a [Text] as child.
   /// [message] contains your label to be shown by the tooltip when
  
positive.code: ///
  /// ```dart
  /// Widget build(BuildContext context) {
  ///   return Center(
  ///     child: Tooltip(
  ///       message: "I am a Tooltip",
  ///       child: Text("Tap this text and hold down to show a tooltip."),
  ///       decoration: BoxDecoration(
  ///         borderRadius: BorderRadius.circular(25),
  ///         gradient: LinearGradient(colors: [Colors.amber, Colors.red]),
  ///       ),
  ///       height: 50,
  ///       padding: EdgeInsets.all(8.0),
  ///       preferBelow: false,
  ///       textStyle: TextStyle(
  ///         fontSize: 24,
  ///       ),
  ///       showDuration: Duration(seconds: 2),
  ///       waitDuration: Duration(seconds: 1),
  ///     ),
  ///   );
  /// }
  /// ```
  
negative.code: ///
  /// ```dart
  /// Widget build(BuildContext context) {
  ///   return Tooltip(
  ///     message: "I am a Tooltip",
  ///     child: Text("Tap this text and hold down to show a tooltip."),
  ///   );
  /// }
  /// ```
  /// {@end-tool}
  ///
  /// {@tool dartpad --template=stateless_widget_scaffold_center}
  ///
  /// This example covers most of the attributes available in Tooltip.
  /// `decoration` has been used to give a gradient and borderRadius to Tooltip.
  