Examine source code of Ravelry

{
  "theme": {
    "images": {
      "theme_frame": "ravheaderfinal.jpg"
    },
    "colors": {
      "frame": "#262525",
      "tab_background_text": "#616161"
    }
  },
  "version": "2.0",
  "name": "Ravelry",
  "manifest_version": 2,
  "description": "made for Ravelry a free site made especially for knitters and crocheters. \n\norg artwork by verabee used with permission"
}