Which of the following is a major advantage of using the appendChild() method?

The appendChild() method is primarily used to add a new node to the end of a specified parent node in the Document Object Model (DOM). One of its significant advantages is that it allows you to add elements to the DOM without overwriting any existing elements on the page. This means that you can dynamically insert new content or elements while retaining the existing structure and content of the document.

For example, if you have a list and you want to add an additional item, using appendChild() will append that item to the list without removing the other items. This makes it an essential method for updating the user interface and enhancing interactivity without disrupting the existing content.

In contrast to the other options, the method does not modify existing elements directly, does not perform automatic validation of properties, and does not support adding multiple nodes simultaneously; these functionalities are covered by other methods or require additional programming logic. Thus, the core advantage of appendChild() is its ability to safely add new elements without altering what's already present in the DOM.