class PrawnHtml::Attributes

def apply_rule!(merged_styles:, rule:, value:, options:)
  return (@initial << rule) if value == 'initial'
  if rule[:set] == :append_styles
    val = Utils.normalize_style(value, rule[:values])
    (merged_styles[rule[:key]] ||= []) << val if val
  else
    opts = rule[:options] ? options[rule[:options]] : nil
    val = Utils.send(rule[:set], value, options: opts)
    merged_styles[rule[:key]] = val if val
  end
end