Get canvas from context

ctx.canvas should return the canvas DOM node, from which you can get height and width.

I tried it with https://developer.mozilla.org/en-US/docs/Web/API/Canvas_API/Tutorial/Basic_usage

Firefox was able to return ctx.canvas, as well as ctx.canvas.width and ctx.canvas.height. Also confirmed in Chrome.

Try this to check for yourself:

var canvas = document.createElement('canvas');
var context = canvas.getContext('2d');
var isSameObject = canvas === context.canvas;

alert(isSameObject
    ? 'context.canvas gives expected result'
    : 'unexpected result');

Here's the above in a jsFiddle.

Get canvas from context

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