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What is the purpose of the canvas element?

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What is the purpose of the canvas element?

(a) Creates drawing surface

(b) Exposes powerful drawing API to client-side JavaScript

(c) Creates drawing surface & Exposes powerful drawing API to client-side JavaScript

(d) Creates a rectangular box

This question was addressed to me in unit test.

My enquiry is from Graphics topic in chapter Graphics and Rendering of JavaScript

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The correct choice is (c) Creates drawing surface & Exposes powerful drawing API to client-side JavaScript

Explanation: The HTML canvas element is used to draw graphics, on the fly, via JavaScript. The canvas element is only a container for graphics. The canvas element has no appearance of its own but creates a drawing surface within the document and exposes a powerful drawing API to client-side JavaScript.

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