device-class.js

var platforms = [
    { category: 'windows', tokens: /(Windows)/i },
    { category: 'mac', tokens: /(Macintosh)/i },
    { category: 'iOS', tokens: /(iPad|iPhone|iPod)/i },
    { category: 'android', tokens: /(Android)/i },
    { category: 'silk', tokens: /(Silk)/i },
    { category: 'winmobile', tokens: /(Windows Phone OS|Zune)/i },

    // Linux is tricky because Anroid reports itself as Linux.
    // If you are using is.linux to detect desktop linux make sure you also check !is.android
    { category: 'linux', tokens: /(Linux)/i }
];

for (var i=0;i<platforms.length;i++) {
  if (platforms[i].tokens.test(window.navigator.userAgent)) {
    $('html').addClass('is-' + platforms[i].category);
  }
  
}