2D canvas opacityThe optional alpha parameter of a 2D canvas's getContext() method sets whether the canvas has an alpha transparency channel. If set to false, then this permits the browser to optimize compositing for an opaque canvas.canvasCanvaslimitedhttps://html.spec.whatwg.org/multipage/canvas.html#concept-canvas-alphahttps://developer.mozilla.org/docs/Web/API/HTMLCanvasElement/getContextapi.HTMLCanvasElement.getContext.2d_context.options_alpha_parameterhttps://nowyoucanuse.com/features--canvas-2d-alpha.html