docs: function getVendorPropertyName(prop) {
      // Handle unprefixed versions (FF16+, for example)
      if (prop in div.style) return prop;
  
      var prefixes = ['Moz', 'Webkit', 'O', 'ms'];
      var prop_ = prop.charAt(0).toUpperCase() + prop.substr(1);
  
      if (prop in div.style) { return prop; }
  
      for (var i=0; i<prefixes.length; ++i) {
        var vendorProp = prefixes[i] + prop_;
        if (vendorProp in div.style) { return vendorProp; }
      }
    }