Which of the following is a feature of HTML5?

HTML5 introduced several significant features that enhance web development, and one of its key attributes is the ability to support a variety of functions which were not as robust or standardized in previous versions of HTML.

Local storage capabilities are a notable feature in HTML5, allowing web applications to store data on the client's browser. This means that data can be saved in a way that persists even after the user closes the browser or navigates away from the page. This is critical for creating seamless user experiences, such as retaining user preferences or enabling offline functionality for applications.

Furthermore, HTML5 supports custom fonts through the @font-face rule, enabling designers to use fonts that are not locally installed on users’ devices. This capability allows for richer typography and better branding opportunities on the web.

Additionally, the support for XML is relevant since HTML5 can work alongside XML formats. It was designed to be more compatible with XML, allowing for more flexible data presentation and manipulation.

Considering these features together demonstrates the comprehensive enhancements HTML5 made over its predecessors, and recognizing their collective importance reflects a broader understanding of web development capabilities in HTML5. Thus, the correct choice indicates that all these features are integral components of HTML5.