Document.getElementsByClassName
Document.getElementsByClassName is a JavaScript method that returns a live HTMLCollection of elements with the specified class name(s) in the document. It allows developers to quickly select and manipulate DOM elements based on their CSS class, providing a convenient way to access groups of elements without needing unique IDs. This method is part of the Document Object Model (DOM) API and is widely supported across all modern browsers.
Developers should use getElementsByClassName when they need to select multiple elements that share a common class, such as styling all buttons with a specific class or updating content in a group of similar elements. It is particularly useful for dynamic web applications where elements are added or removed, as the returned collection updates automatically. However, for more complex selections, querySelectorAll might be preferred due to its CSS selector support.