function getViewportInfo() {
    return {
        scroll_x: window.pageXOffset,
        scroll_y: window.pageYOffset,
        width: window.innerWidth,
        height: window.innerHeight,
        max_scroll_x: Math.max(document.documentElement.scrollWidth - window.innerWidth, 0),
        max_scroll_y: Math.max(document.documentElement.scrollHeight - window.innerHeight, 0),
        pageYOffset: window.pageYOffset,
        pageXOffset: window.pageXOffset
    };
}