matrix-spec/content/rooms/fragments/v1-deprecated-formatting-off-spec.md

Events sent into rooms of this version can have formats which are different from their normal schema. Those cases are documented here.

{{% boxes/warning %}} The behaviour described here is preserved strictly for backwards compatibility only. A homeserver should take reasonable precautions to prevent users from sending these so-called "malformed" events, and must never rely on the behaviours described here as a default. {{% /boxes/warning %}}