// https://html.spec.whatwg.org/multipage/canvas.html#canvasrect
interface mixin CanvasRect {
    undefined clearRect(unrestricted double x, unrestricted double y, unrestricted double w, unrestricted double h);
    undefined fillRect(unrestricted double x, unrestricted double y, unrestricted double w, unrestricted double h);
    undefined strokeRect(unrestricted double x, unrestricted double y, unrestricted double w, unrestricted double h);
};