text: window.addEventListener('load', (event) => {
  //    Vue.config.devtools = true; //Uncaught TypeError: Cannot set property 'devtools' of undefined
      const Counter = {
          data() {
              return {
                  counter: 0
              }
          },
          mounted() {
              setInterval(() => {
                  this.counter++;
              }, 1000);
          }
      };
      Vue.createApp(Counter).mount('#counter')
  });
  