\n    document.addEventListener(\"contextmenu\", function(e){\n      e.preventDefault();\n    }, false);\n    document.addEventListener(\"keydown\", function(e) {\n    //document.onkeydown = function(e) {\n      // \"I\" key\n      if (e.ctrlKey && e.shiftKey && e.keyCode == 73) {\n        disabledEvent(e);\n      }\n      // \"J\" key\n      if (e.ctrlKey && e.shiftKey && e.keyCode == 74) {\n        disabledEvent(e);\n      }\n      // \"S\" key + macOS\n      if (e.keyCode == 83 && (navigator.platform.match(\"Mac\") ? e.metaKey : e.ctrlKey)) {\n        disabledEvent(e);\n      }\n      // \"U\" key\n      if (e.ctrlKey && e.keyCode == 85) {\n        disabledEvent(e);\n      }\n      // \"F12\" key\n      if (event.keyCode == 123) {\n        disabledEvent(e);\n      }\n    }, false);\n    function disabledEvent(e){\n      if (e.stopPropagation){\n        e.stopPropagation();\n      } else if (window.event){\n        window.event.cancelBubble = true;\n      }\n      e.preventDefault();\n      return false;\n    }\n  \n