anchor.diff:            .compile(input)
             .timeout(longServiceCallTimeout)
             .then((CompileResponse response) {
  +        ga?.sendEvent('execution', 'html-compile-success');
           return executionSvc.execute(
               context.htmlSource, context.cssSource, response.result);
         }).catchError((e, st) {
           consoleExpandController
               .appendError('Error compiling to JavaScript:\n$e');
           print(st);
  +        ga?.sendEvent('execution', 'html-compile-failure');
         }).whenComplete(() {
           webOutputLabel.setAttr('hidden');
           editorIsBusy = false;
  
positive.code: 
  class NewEmbedOptions {
    final NewEmbedMode mode;
    NewEmbedOptions(this.mode);
  }
  
  
negative.code: import 'dart:html' hide Document;
  import 'dart:math' as math;
  
  import 'package:dart_pad/src/ga.dart';
  import 'package:split/split.dart';
  import 'package:mdc_web/mdc_web.dart';
  
  