FontFeature.subscripts constructor Null safety

const FontFeature.subscripts()

Enable subscripts. (subs)

This feature causes some fonts to change some glyphs to their subscripted form.

It typically does not affect all glyphs, and so is not appropriate for generally causing all text to be subscripted.

This may override other features that substitute glyphs.

link
The Piazzolla font supports the subs feature. It causes digits to be smaller and subscripted.

To create a local project with this code sample, run:
flutter create --sample=dart.dart_ui.FontFeature.subscripts.1 mysample 
import 'dart:ui';

import 'package:flutter/widgets.dart';

void main() => runApp(const ExampleApp());

class ExampleApp extends StatelessWidget {
  const ExampleApp({super.key});

  @override
  Widget build(BuildContext context) {
    return WidgetsApp(
      builder: (BuildContext context, Widget? navigator) =>
          const ExampleWidget(),
      color: const Color(0xffffffff),
    );
  }
}

class ExampleWidget extends StatelessWidget {
  const ExampleWidget({super.key});

  @override
  Widget build(BuildContext context) {
    // The Piazzolla font can be downloaded from Google Fonts (https://www.google.com/fonts).
    return const Text(
      'Line from x1,y1 to x2,y2',
      style: TextStyle(
        fontFamily: 'Piazzolla',
        fontFeatures: <FontFeature>[
          FontFeature.subscripts(),
        ],
      ),
    );
  }
}

See also:

Implementation

const FontFeature.subscripts() : feature = 'subs', value = 1;