JavaScript、DOMにおいてイベントは極めて重要です。ブラウザ上のJavaScriptでは必ずといってよいほどイベントが絡んでいますし、ウェブアプリケーションをコントロールする根幹的な技術と言えるほどです。

Of all the hats JavaScript can wear, its form-processing features are among the most sought and used. Learn how to use JavaScript for form processing, validation, and more.

That's all it takes to create an HTML input element and assign it to a variable named "box." The box object doesn't become a text box until you give its type attribute a value of "text" as shown ...