code: function(prefix, func, values) {
  					if (values[0].indexOf('at') < 0) {
  						// Looks like old syntax
  
  						// Default values
  						var position = 'center';
  						var shape = 'ellipse';
  						var size = 'farthest-corner';
  
  						if (/\bcenter|top|right|bottom|left\b|^\d+/.test(values[0])) {
  							// Found a position
  							// Remove angle value, if any
  							position = values.shift().replace(/\s*-?\d+(?:rad|deg)\s*/, '');
  						}
  						if (/\bcircle|ellipse|closest|farthest|contain|cover\b/.test(values[0])) {
  							// Found a shape and/or size
  							var shapeSizeParts = values.shift().split(/\s+/);
  							if (shapeSizeParts[0] && (shapeSizeParts[0] === 'circle' || shapeSizeParts[0] === 'ellipse')) {
  								shape = shapeSizeParts.shift();
  							}
  							if (shapeSizeParts[0]) {
  								size = shapeSizeParts.shift();
  							}
  
  							// Old keywords are converted to their synonyms
  							if (size === 'cover') {
  								size = 'farthest-corner';
  							} else if (size === 'contain') {
  								size = 'clothest-side';
  							}
  						}
  
  						return func + '(' + shape + ' ' + size + ' at ' + position + ',' + values.join(',') + ')';
  					}
  					return func + '(' + values.join(',') + ')';
  				}
docs: Returns a W3C-valid radial gradient
  @param {string} prefix Vendor prefix if any ("-moz-", "-webkit-", etc.)
  @param {string} func Gradient function name ("linear-gradient")
  @param {string[]} values Array of the gradient function parameters (["0deg", "red 0%", "blue 100%"])