var Fullscreen = { 
available: false ,
cancel: '',
keyboard: false ,
request: ''}
; 
function init(){ 
var i; 
var suffix1 = 'Fullscreen'; 
var suffix2 = 'FullScreen'; 
var fs = ['request' + suffix1, 'request' + suffix2, 'webkitRequest' + suffix1, 'webkitRequest' + suffix2, 'msRequest' + suffix1, 'msRequest' + suffix2, 'mozRequest' + suffix2, 'mozRequest' + suffix1] ; 
for (i = 0; i < _AN_Read_length('length', fs); i++ ){ 
if (document.documentElement[fs[i]]) { 
Fullscreen.available = true ; 
Fullscreen.request = fs[i]; 
break ; 
} 
} 
var cfs = ['cancel' + suffix2, 'exit' + suffix1, 'webkitCancel' + suffix2, 'webkitExit' + suffix1, 'msCancel' + suffix2, 'msExit' + suffix1, 'mozCancel' + suffix2, 'mozExit' + suffix1] ; 
if (Fullscreen.available) { 
for (i = 0; i < _AN_Read_length('length', cfs); i++ ){ 
if (document[cfs[i]]) { 
Fullscreen.cancel = cfs[i]; 
break ; 
} 
} 
} 
if (window.Element && Element.ALLOW_KEYBOARD_INPUT && !(/ Version\/5\.1(?:\.\d+)? Safari\//).test(navigator.userAgent)) { 
Fullscreen.keyboard = true ; 
} 
Object.defineProperty(Fullscreen, 'active', { 
get: function (){ 
return !!(document.fullscreenElement || document.webkitFullscreenElement || document.mozFullScreenElement || document.msFullscreenElement); 
} 
}
); 
return Fullscreen; 
} 
module.exports = init();