The keywords may be entered in English or German all captial letters, all lower case or with the first character capitalized.

• left(); links(); left(30); LINKS(45);
• right(); rechts(); right(30); RECHTS(45);
• step(); schritt(); step(4); Schritt(4);

Advanced (only in one language and capitalization):

• up(); // lift the pen up
• down(); // put the pen down
• color("red"); color("#00ff00");
• wait(1000); // milliseconds
• All other javascript functions ;-)

A single file version without dependencies that can be stored and used locally can be found here
Contact: Thomas M. Frey