What do you need to use in combination with the <canvas> element to draw graphics?

The element is a powerful feature in HTML that allows you to draw graphics on the fly, but it doesn't have inherent capabilities to handle drawing or rendering on its own. To create and manipulate graphics within the , you must use JavaScript, which provides the necessary programming functionality.

JavaScript offers a rich set of APIs that can be applied to the context, enabling you to execute commands for drawing shapes, images, and animations. For instance, you can use methods such as fillRect(), strokeRect(), and drawImage() to create various graphics. The interactivity and dynamic updates that JavaScript provides make it an essential component when working with the element.

The other choices don't fulfill the requirements for drawing graphics on a . HTML alone sets up the structure but lacks the dynamic behavior needed for graphics manipulation. CSS is used primarily for styling and layout and does not handle the rendering of graphics. PHP, being a server-side language, does not interact with the in the same way and is not applicable for client-side drawing tasks. Hence, using JavaScript in combination with is necessary to achieve the desired graphics output.