alsiola

  <script>
    const form = document.getElementById("form");
    form.addEventListener("submit", event => event.preventDefault())
  </script>
  <form id="form">...</form>

  <form => event.preventDefault()}>...</form>

  <form @submit.prevent="onSubmit">...</form>

  <script>
    let numbers = $state([1, 2, 3, 4]);

    function addNumber() {
      numbers.push(numbers.length + 1);
    }

    const sum = numbers.reduce((x, y) => x + y, 0);
  </script>

  <p>{numbers.join(' + ')} = {sum}</p>

  <button
   Add a number
  </button>