Document Object Model

Overview

The DOM represents an HTML or XML document as a tree structure where each node is an object representing a part of the document. JavaScript uses the DOM to interact with and manipulate web pages dynamically.

Key Operations

• Selecting Elements: Using methods like getElementById or querySelector.
• Modifying Content: Changing text or HTML using textContent or innerHTML.
• Event Handling: Attaching listeners to respond to user actions like clicks or keypresses.
• Styling: Dynamically updating CSS properties via the style object.

Performance

Frequent DOM manipulation can be slow. Modern frameworks often use a 'Virtual DOM' to optimize updates and improve performance.