Question

To draw on the canvas, authors must first obtain a reference to a context using the ______________ method of the canvas interface element.

(a) getImageData

(b) toDataURL

(c) getContext

(d) restore

I got this question in an online interview.

This interesting question is from Client-Side Graphics with Canvas in chapter HTML Markup, Forms, Video, Audio & Other Multimedia of HTML

Answer 1

The correct choice is (c) getContext

To explain I would say: The method getImageData(), returns an imageData that copies  pixel data for a specified thing in canvas. ContextType is a DOMString containing the context identifier defining the drawing context associated to the canvas.