class CKEditor5::Rails::Presets::PresetBuilder

def special_characters(&block)

Other tags:
    Example: Mixed configuration -
    Example: Configuration with direct items array -
    Example: Basic configuration with block -

Other tags:
    Yield: - Block for configuring special characters 
def special_characters(&block)
  builder = SpecialCharactersBuilder.new
  builder.instance_eval(&block) if block_given?
  plugins do
    append(:SpecialCharacters)
    builder.packs_plugins.each { |pack| append(pack) }
    prepend(Plugins::SpecialCharactersBootstrap.new)
  end
  configure(:specialCharactersBootstrap, builder.to_h)
end