Western Governors University (WGU) ITWD3120 C777 Web Development Applications Practice Exam

The correct choice for this question is the application programming interface (API). An API provides a set of predefined functions and protocols that allow developers to add specific functionalities to applications without needing to write all of the code from scratch. In the context of HTML5, APIs enable the manipulation of multimedia elements like audio and video, allow for document editing capabilities through features like the Content Editable attribute, and facilitate the use of web storage via localStorage and sessionStorage.

APIs serve as intermediaries that enable communication between different software components, making it easier for developers to utilize complex features provided by a browser or service. By leveraging APIs, developers can create richer web experiences with less effort and increased efficiency, focusing on integrating these ready-made functions rather than building everything themselves.

The other options, while related to web development, do not fit the criteria specified in the question. A software development kit (SDK) is a comprehensive collection of tools, libraries, and documentation that aids in building applications, but is broader than just predefined code for HTML5. The document object model (DOM) is a programming interface that represents the structure of a webpage as a tree of objects, but it doesn't provide the predefined functions for functionality like media or web storage directly. Asynchronous JavaScript