type of a graphic context
Open a graphics window. The graphics window is cleared and the current point is set to (0, 0). The string argument is used to pass optional information on the desired graphics mode, the graphics window size, and so on. Specification can be found at http://www.w3schools.com/jsref/met_win_open.asp. Note: an extra specification is availble, "target", to specifies the target attribute or the name of the window.