Form Submit.

A form sends data on submit (button or Enter). The browser reloads by default — for lesson-style apps call event.preventDefault().

Listen for "submit" on <form>, not only click on the button.

Mini example:

const form = document.querySelector("#form"); const msg = document.querySelector("#msg"); form.addEventListener("submit", (event) => { event.preventDefault(); msg.textContent = "saved"; });

Common mistake: forgetting preventDefault; or listening for click instead of submit.