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Page: https://www.postgresql.org/docs/13/sql-createtrigger.html
Description:

https://www.postgresql.org/docs/current/sql-createtrigger.html mentions the
word "transaction" only once, in reference specifically to constraint
triggers: "They can be fired either at the end of the statement causing the
triggering event, or at the end of the containing transaction; in the latter
case they are said to be deferred."

If I understand correctly, it would be helpful to add this sentence or a
corrected version of it: "Triggers always execute in the same transaction as
the triggering event, and if a trigger fails, the transaction is rolled
back."