Marak/colors.js — pull request #46 by zofrex (2013-03-07 22:35:20+00:00)
Title: Change 'grey' to 'gray' in HTML/CSS output

Most browsers support both 'grey' and 'gray' in CSS, but only IE8+.

Source: https://developer.mozilla.org/en-US/docs/CSS/color_value#1