OptionalcanvasCanvas element (Canvas2D backend only).
Optionalctx2D context (Canvas2D backend only).
OptionalfboGL framebuffer object (WebGL2 backend only).
Height of the framebuffer in pixels.
OptionaltextureGL texture attachment (WebGL2 backend only).
Width of the framebuffer in pixels.
Offscreen render target. Holds either a Canvas2D surface or a WebGL2 FBO.