anchor.diff:          for (String groupName in match.groupNames) {
             groupNameToMatch[groupName] = match.namedGroup(groupName);
           }
  +        if (kIsWeb) {
  +          return NoAnimationMaterialPageRoute<void>(
  +            builder: (context) => path.builder(context, groupNameToMatch),
  +            settings: settings,
  +          );
  +        }
           return MaterialPageRoute<void>(
             builder: (context) => path.builder(context, groupNameToMatch),
             settings: settings,
  
positive.code:     return null;
    }
  }
  
negative.code: import 'package:flutter/foundation.dart';
  import 'package:flutter/material.dart';
  import 'package:gallery/main.dart';
  import 'package:gallery/pages/demo.dart';
  