getElementsByTagName
getElementsByTagName is a DOM (Document Object Model) method in JavaScript that returns a live HTMLCollection of elements with a given tag name from the document. It allows developers to select and manipulate multiple elements based on their HTML tag, such as all <div> or <p> elements. This method is part of the core DOM API and is widely used for dynamic web page interactions.
Developers should use getElementsByTagName when they need to quickly select and work with all elements of a specific type in a document, such as updating styles, adding event listeners, or modifying content in bulk. It is particularly useful for tasks like form validation, content filtering, or dynamic UI updates where targeting elements by tag is efficient, though it has been largely superseded by more modern methods like querySelectorAll for complex selections.