Ctrl-Shift-C in Chrome, or Ctrl-Shift-J in Firefox,
will give you a programmable computing environment more powerful and expressive than a 20-year old Atari, Commodore, or Apple.
Which means I have to have a computer already which is not < $200. Also, I really doubt I can use Firefox or Chrome to hook up some photocells to the machine and take readings or use the photocells as a musical instrument.