code: function renderedStyle(property) {
      var cy = this.cy();
  
      if (!cy.styleEnabled()) {
        return this;
      }
  
      var ele = this[0];
  
      if (ele) {
        return cy.style().getRenderedStyle(ele, property);
      }
    }
docs: get the specified css property as a rendered value (i.e. on-screen value) or get the whole rendered style if no property specified (NB doesn't allow setting)