Which language should a developer use to create a border with rounded corners on a web page using in-line markup?

Java is a versatile programming language primarily used for creating standalone applications, web applications, and mobile apps. It is not designed for styling web pages or handling markup directly. Therefore, Java cannot be used to create rounded borders on web pages, as it lacks any direct capability for styling HTML elements.

HTML5 is the latest version of the Hypertext Markup Language used for structuring content on the web. While HTML5 supports multimedia and semantic elements, it does not include any styling features. To create rounded corners, developers must use CSS, as HTML alone cannot manage visual presentation aspects like borders.

XML (eXtensible Markup Language) is a markup language used for storing and transporting data. Unlike CSS, XML does not have capabilities for visual styling or layout design. Therefore, it cannot be employed to create rounded corners on a web page, as its primary function is data representation rather than presentation.