Important FAQ

What is the Document Object Model (DOM)?

The Document Object Model (DOM) is a tree-like structure representing a webpage's elements. It allows JavaScript to dynamically modify content, structure, and style, enabling interactive features without reloading the page. The DOM is widely supported by modern browsers.

How do you select an element from the DOM?

To select an element from the DOM, I can use JavaScript methods like:

  • document.getElementById() to select by ID.
  • document.querySelector() to select the first element matching a CSS selector.
  • What is Event delegation in the context of the DOM, and why is it useful?

    Event delegation is a technique where a parent element handles events from its child elements via a single listener. It improves performance by reducing the number of event listeners and efficiently handles dynamic content.

    How do you manipulate an element's attributes and style the DOM?

    To manipulate an element's attributes and style in the DOM:

  • Use setAttribute() or getAttribute() to change or retrieve attributes.
  • You can also add or remove CSS classes with element.classList.add() or element.classList.remove().