lib/index.js
function isFullscreen() {
    var _document = document;
    if (!_document.fullscreenElement &&
        !_document.mozFullScreenElement &&
        !_document.webkitFullscreenElement &&
        !_document.msFullscreenElement) {
        return false;
    }
    return true;
}
function isFullscreen() {
    var _document = document;
    if (!_document.fullscreenElement &&
        !_document.mozFullScreenElement &&
        !_document.webkitFullscreenElement &&
        !_document.msFullscreenElement) {
        return false;
    }
    return true;
}
function isFullscreen ( ) { var _document = document ; if ( ! _document . fullscreenElement && ! _document . mozFullScreenElement && ! _document . webkitFullscreenElement && ! _document . msFullscreenElement ) { return false ; } return true ; }
check if fullscreen or not.
@returns {boolean}
check if fullscreen or not .