         string += `; borderBoxSize [inline=${borderBoxSize.inlineSize}px, block=${borderBoxSize.blockSize}px]`;
                string += `; contentBoxSize [inline=${contentBoxSize.inlineSize}px, block=${contentBoxSize.blockSize}px]`;
                string += `; deviceBoxSize [inline=${deviceBoxSize.inlineSize}px, block=${deviceBoxSize.blockSize}px]`;
                println(string);
            }

            if (resolve) resolve();
        });

        let observerCallbackInvocation = createResizeObserv