When would continuous deployment can be used with a distribution that supports HTTP/3.

Unfortunately, CloudFront distribution that supports HTTP/3 does not yet have access to the continuous deployment feature.

I would like to let you know that we already have a feature request for this feature in place.

Though we do not have an ETA for the fulfilment of same, please be assured that AWS is continuously improving its services and you can keep track of AWS latest services and products. If the request is approved, the changes will be posted on https://aws.amazon.com/blogs/aws/ and https://aws.amazon.com/new for all new AWS feature updates.