class Sanitize::Transformers::CSS::CleanAttribute

def call(env)
  node = env[:node]
  return unless node.type == Nokogiri::XML::Node::ELEMENT_NODE &&
    node.key?("style") && !env[:is_allowlisted]
  attr = node.attribute("style")
  css = @scss.properties(attr.value)
  if css.strip.empty?
    attr.unlink
  else
    attr.value = css
  end
end