What component allows for real-time manipulation of graphical objects on a webpage?

The correct choice is Canvas, as it is specifically designed for real-time rendering and manipulation of graphics directly in a web browser. The HTML5 <canvas> element provides an immediate mode graphics API, enabling developers to draw and manipulate shapes, images, and other graphical elements dynamically. This capability allows for immediate visual feedback and interaction without the need for reloading or redrawing the entire page.

Canvas supports various operations, such as drawing lines, filling shapes, and even handling animations through JavaScript. It is suitable for applications like games, visualizations, and graphic editors where the graphical output can change based on user input.

In contrast, Dynamic HTML refers to a collection of technologies that allow for animated and interactive content, but it does not provide the same degree of direct manipulation of graphical objects as the Canvas element. Application Cache was an early method for offline web applications but has since been deprecated, and it does not directly relate to real-time graphical manipulation. XMLHttpRequest is a technique used for asynchronous HTTP requests, primarily for fetching data, rather than for rendering or manipulating graphics on a webpage.