code: function _Browser_visibilityInfo() {
      return typeof _VirtualDom_doc.hidden !== "undefined"
        ? { hidden: "hidden", change: "visibilitychange" }
        : typeof _VirtualDom_doc.mozHidden !== "undefined"
          ? { hidden: "mozHidden", change: "mozvisibilitychange" }
          : typeof _VirtualDom_doc.msHidden !== "undefined"
            ? { hidden: "msHidden", change: "msvisibilitychange" }
            : typeof _VirtualDom_doc.webkitHidden !== "undefined"
              ? { hidden: "webkitHidden", change: "webkitvisibilitychange" }
              : { hidden: "hidden", change: "visibilitychange" };
    }
docs: PAGE VISIBILITY