CSS3 transitions recognition

gistfile1.js

function supportsTransitions() {
  var b = document.body || document.documentElement;
  var s = b.style;
  var p = 'transition';
  if (typeof s[p] == 'string') {
    return true;
  }

  // Tests for vendor specific prop
  v = ['Moz', 'Webkit', 'Khtml', 'O', 'ms'],
  p = p.charAt(0).toUpperCase() + p.substr(1);
  for (var i = 0; i < v.length; i++) {
    if (typeof s[v[i] + p] == 'string') {
      return true;
    }
  }
  return false;
}