Currently the spec doesn't quite talk much about the path that contextual requests will take aside from being a separate request that happens server side.

For example:

• will those ads participate in the same auction as interest group ads?
• will those ads be rendered in a fenced frame too? (the spec says that winning ads are rendered in a fenced frame, but FLEDGE : Answering contextual requests with a generate_bid() function #116 maybe says they won't?)
• will contextual requests use the same reporting/attribution mechanisms as interest group ads?

Maybe I'm missing the bits in the spec where I could find answers to those.