code: function(element, style) {
    Object.keys(style).forEach(function(key) {
      if (key in element.style) {
        element.style[key] = style[key];
      } else if (prefix(key) in element.style) {
        element.style[prefix(key)] = style[key];
      } else {
        util.warn('No such style property: ' + key);
      }
    });
    return element;
  }
docs: Minimal utility library for manipulating element's style.
  Set element's style.
  
  @param {Element} element
  @param {Object} styles
  @return {Element}