Last updated: August 27, 2026.
JavaScript is a programming language standardized as ECMAScript. Browsers use it with HTML and CSS, while runtimes such as Node.js use it outside the browser.
const message = document.querySelector("#message");
const button = document.querySelector("#change-message");
button.addEventListener("click", () => {
message.textContent = "JavaScript updated this text.";
});JavaScript and Java are separate languages. Use the MDN JavaScript Guide for a current overview.
