anchor.diff:      'autoCloseTags': true,
       'mode': 'clike',
       'matchBrackets': true,
  +    'indentUnit': 4,
       'extraKeys': {
         'Ctrl-Space': 'autocomplete',
         'Cmd-/': 'toggleComment',
  
positive.code:       ..contentEditable = "false";
      textArea.classes.add('code-editor-text-area');
      target.children..add(runBtn)..add(output);
      if (options != null) this.options = options;
      _editor = new CodeMirror.fromTextArea(textArea, options: this.options);
      output
        ..text = "output"
  
negative.code: import "fmt"
  
  func main() {
        fmt.Println("Hello, Go!")
  }""";
  
  const String startingJavaCode = """// Do not change the name of this class
  