anchor.diff:    /// (using [Text.rich]), the desired rendering for each glyph can be
     /// achieved.
     ///
  -  /// ```dart dartImports
  -  /// import 'dart:ui';
  -  /// ```
  -  ///
  -  /// ```dart
  -  /// Widget build(BuildContext context) {
  -  ///   // The Raleway font can be downloaded from Google Fonts (https://www.google.com/fonts).
  -  ///   return const Text(
  -  ///     'The infamous Tuna Torture.',
  -  ///     style: TextStyle(
  -  ///       fontFamily: 'Raleway',
  -  ///       fontFeatures: <FontFeature>[
  -  ///         FontFeature.alternative(1), // or 2, or 3, or...
  -  ///       ],
  -  ///     ),
  -  ///   );
  -  /// }
  -  /// ```
  -  ///
     /// ![](https://flutter.github.io/assets-for-api-docs/assets/dart-ui/font_feature_aalt.png)
  +  ///
  +  /// ** See code in examples/api/lib/ui/text/font_feature.font_feature_alternative.0.dart **
     /// {@end-tool}
     ///
     /// See also:
  
positive.code:   /// This feature may override other glyph-substitution features.
    ///
    /// {@tool sample --template=stateless_widget}
    ///
    /// The Cardo font supports the `hist` feature specifically for the
    /// letter "s": it changes occurrences of that letter for the glyph
    /// used by U+017F LATIN SMALL LETTER LONG S.
    ///
    /// ```dart dartImports
    /// import 'dart:ui';
    /// ```
    ///
    /// ```dart
    /// Widget build(BuildContext context) {
    ///   // The Cardo font can be downloaded from Google Fonts (https://www.google.com/fonts).
    ///   return const Text(
    ///     'VIBRANT fish assisted his business.',
    ///     style: TextStyle(
    ///       fontFamily: 'Sorts Mill Goudy',
    ///       fontFeatures: <FontFeature>[
    ///         FontFeature.historicalForms(), // Enables "hist".
    ///         // Use FontFeature.historicalLigatures() to enable "hlig" as well.
    ///       ],
    ///     ),
    ///   );
    /// }
    /// ```
    ///
    /// ![](https://flutter.github.io/assets-for-api-docs/assets/dart-ui/font_feature_historical.png)
    /// {@end-tool}
    ///
    /// See also:
  
negative.code:   /// This may override other features that substitute glyphs.
    ///
    /// {@tool sample --template=stateless_widget}
    /// The Piazzolla font supports the `ordn` feature. It causes
    /// alphabetic glyphs to become smaller and superscripted.
    ///
    /// ![](https://flutter.github.io/assets-for-api-docs/assets/dart-ui/font_feature_ordn.png)
    ///
    /// ** See code in examples/api/lib/ui/text/font_feature.font_feature_ordinal_forms.0.dart **
    /// {@end-tool}
    ///
    /// See also:
  