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Showing content from https://webplatform.github.io/docs/apis/canvas below:

canvas Summary

Allows applications to render pixel-based graphics within a canvas element using a two-dimensional graphics context.

CanvasGradient: An opaque object of the canvas API.
CanvasPattern: An opaque object of the canvas API. See Notes.
CanvasPixelArray: Specifies each pixel within a canvas’s rectangular selection, via the ImageData object’s data property. The array uses four elements to represent each pixel’s red, green, blue, and alpha channels. See Notes.
CanvasRenderingContext2D: The 2D rendering context for the drawing surface of a <canvas> element.
ImageData: The ImageData object of the canvas API.
TextMetrics: The TextMetrics object of the canvas API. TextMetrics retrieves numeric informations like the width of a text that is drawn onto the canvas with the current font style.