anchor.diff:  
   import 'dart:async';
   import 'dart:html' hide Document;
  +import 'dart:math' as math;
   
   import 'package:split/split.dart';
   
  
positive.code:   }
  
    bool get supportsFlutterWeb {
      Uri url = Uri.parse(window.location.toString());
      return url.queryParameters['fw'] == 'true';
    }
  }
  
  
negative.code:         horizontal: true,
          gutterSize: defaultSplitterWidth,
          // set initial sizes (in percentages)
          sizes: [initialSplitPercent, (100 - initialSplitPercent)],
          // set the minimum sizes (in pixels)
          minSize: [100, 100],
        );
  