ImageData

2D canvas canvas-2d

Baseline: Widely available on the web, in every major browser since Jul 2015, and long enough to count on (since Jan 2018).

niso: Partial 77%. 1209 of 1553 subtests pass, by system: Linux 77%, macOS 77%. Engines: QuickJS, the engine niso's WPT run uses; Node and Porffor have no recorded run. WPT results recorded at f3b4fa8, 2026-11-10; web-features 3.45.0. WPT tests · niso's support · CanvasGradient, CanvasPattern, CanvasRenderingContext2D, ImageData

ImageData is an interface in idl/canvas.webidl, exposed in Window, Worker. What it does is on MDN; this page says what niso has of it.

NisoValue: ImageData has no state in the core, so it crosses the C API as a struct. Its constructors are the glue’s: it makes the array.

Status

The web features its members belong to, each with its Baseline status on the web and how much of the feature’s WPT suite passes in niso (see Web platform support).

Feature	On the web	In niso	Members
2D canvas	Widely available	Partial 77% 1209 of 1553 subtests pass	5

Members

constructor

constructor

[NisoGlue] constructor(any a, any b, optional any c, optional any d);

width

attribute

readonly attribute unsigned long width;

height

attribute

readonly attribute unsigned long height;

data

attribute

readonly attribute Uint8ClampedArray data;

Not in niso yet

Members the web has, by the BCD keys web-features 3.45.0 lists, that idl/ doesn’t declare. The list is partial: web-features lists only the keys it maps to a feature.

• colorSpace (2D canvas)
• worker_support (2D canvas)