module Cucumber::Runtime::UserInterface

The embedded data may or may not be ignored, depending on what kind of formatter(s) are active.
be a path to a file, or if it's an image it may also be a Base64 encoded image.
Embed +src+ of MIME type +mime_type+ into the output. The +src+ argument may

def attach(src, media_type)
  @visitor.attach(src, media_type)
end