Other than the full screen mode demonstrated in the code, it can also be initialized in div tags within a page. Example:

var mySnakeBoard = new SNAKE.Board( {
                                        boardContainer: "game-area",
                                        fullScreen: false,
                                        width: 1000,
                                        height:1000
                                    });

The comments are formatted a little strange because at the time I was playing around with YUI Doc.