This is hosted at http://calormen.com/jslogo for playing with live.

Language Reference - this attempts to implement a subset of UCBLogo defined in in Brian Harvey's Computer Science Logo Style

Use git clone --recursive to get polyfill for older browsers.

to star repeat 5 [ fd 100 rt 144 ] end
star
to square :length repeat 4 [ fd :length rt 90 ] end
repeat 36 [ square 50 rt 10 ]
to randomcolor setcolor pick [ red orange yellow green blue violet ] end
repeat 36 [ randomcolor square random 200 rt 10 ]
window pu repeat 72 [ setlabelheight repcount fd repcount * 2.5 label "Logo bk repcount * 2.5 rt 10 ]

• Logo on Wikipedia
• Other Logo implementations that run in a Web browser:
  • papert - logo in your browser (source code)
  • Curly Logo
• The Logo Foundation
• Berkeley Logo (UCBLogo)
• The Logo Tree Project
• Ian Bicking on Logo
• PyLogo
• Introduction to Computer Programming
• LogoForum

• Document deviations from UCB Logo standard
• Make these examples all work: Logo 15-word challenge
• Use Workers, so you can see the turtle move
• Tail-call optimization