static get observedAttributes() {
    return [
      // Standard watched attributes:
      /* 'inherit-style', */
      "name",
      // Other watched attributes:            
      "filter",
      "id",
      "report",
      "topic",
      "type",
      "undefined",
      "variable"
    ];
  }
Makes HTML attribute change watched
@returns {Array<string>} List of all of the html attribs (props) listened to