HTML provides the structure, content and layout, CSS adds style and design, and JavaScript adds functionality and interactivity.

Ryan Boudreaux includes all the code snippets you'll need in this demo of how to create an image hover-preview effect using HTML, CSS, and JavaScript.

You can make minimal edits to videos in the YouTube Studio, or make more extensive changes in a third-party editing app.

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.