New Trait creation. The value is not set?

I am trying to create a new Trait for a component. The textarea appears but it is not saving when trying to edit back, and the object has no “content” attribute. Why? I am basically using the code from here: https://github.com/artf/grapesjs/wiki/Traits#define-new-trait-type

// Each new type extends the default Trait
editor.TraitManager.addType('content', {
  events:{
    'keyup': 'onChange',  // trigger parent onChange method on keyup
  },

  /**
  * Returns the input element
  * @return {HTMLElement}
  */
  getInputEl: function() {
    var selectedModel = this.target;
    var input = document.createElement('textarea');
    input.value = selectedModel.get('content');
    return input;
  },

  /**
   * Triggered when the value of the model is changed
   */
  onValueChange: function () {
    this.target.set('content', this.model.get('value'));
  }
});

Thank you!

[artf]

done

[NETCreator-US]

Thank you, @artf ! It works now.