DOM & Events

Summary

The browser's programmatic interface for reading and modifying a page's content, and the event system that lets your JavaScript react to clicks, input and other user actions.

• 1Use `document.querySelector` and event listeners to build a small interactive widget without a framework.
• 2Learn event bubbling and delegation for handling events on dynamically added elements.
• 3Understand this is what frameworks like React abstract away — knowing it underneath helps you debug framework issues.