The canvas to extract data from
ImageData containing the canvas pixel data
When canvas context creation fails
const canvas = document.createElement('canvas');
const ctx = canvas.getContext('2d');
ctx.fillRect(0, 0, 100, 100);
const imageData = canvasToImageData(canvas);
console.log(`Canvas size: ${imageData.width}x${imageData.height}`);
Extract ImageData from an HTMLCanvasElement.
Gets the pixel data from the entire canvas as ImageData object.