anchor.diff:    button,
   
     /// A transparent piece of material that draws ink splashes and highlights.
  +  ///
  +  /// While the material metaphor describes child widgets as printed on the
  +  /// material itself and do not hide ink effects, in practice the [Material]
  +  /// widget draws child widgets on top of the ink effects.
  +  /// A [Material] with type transparency can be placed on top of opaque widgets
  +  /// to show ink effects on top of them.
  +  ///
  +  /// Prefer using the [Ink] widget for showing ink effects on top of opaque
  +  /// widgets.
     transparency
   }
   
  
positive.code: 
  /// A piece of material.
  ///
  /// Material is the central metaphor in material design. Each piece of material
  /// exists at a given elevation, which influences how that piece of material
  /// visually relates to other pieces of material and how that material casts
  
negative.code: /// widgets that use the [InkFeature] mechanism. Otherwise, in-progress ink
  /// features (e.g., ink splashes and ink highlights) won't move to account for
  /// the new layout.
  ///
  /// See also:
  ///
  